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MAY 1972
WORLD'S L
A HARCOURT BRACE JOVANO"ICH PUBLICATION
Commercial AudioInstallations,Part III immill1111111=
Professional Antenna Installation Methods
If your problem is measuring pY,p,A and milliohmsin transistorizedand integrated
circuits . . .
Solve it withTriplett's 801
Model 801
1210
It offers 73 measurement ranges
including 8 low -power resis-tance ranges that apply only 35
mV to the device under test ...does not activate or damagesolid-state components. With
full-scale readings as low as 50
mV DC and 5 mV AC, 5 PA DC
and 100 Ohms (1 Ohm center -
scale) - plus a 10 megohm in-
put impedance on the AC scales
and 11 megohm input resistance
on DC Triplett's Model 801
DCV,
DCV
OFF
_2-1 0.1 .2
11T TIVIALITT
SOLID STATE
V-0- MLP a
DC MA
AC -MA
BAT 1
4
1500 .005111.1A
SOD ". .01,115°:::"
,
111E
0.15
15 o 0.51.100
5 15F
1. Lower power ohms - 8 -anges with 35 mV power source and 1 ohm centerscale.
2. High sensitivity -5 mV AC full scale at 10 megohm input impedance, 50 mVDC at 11 megohm input resistance.
3. Simplified scale - 8" meter with only 4 arcs for all 73 ranges.
V -O -M is ideally suited toin -circuit testing. When you add
2% DC and 3% AC accuracy
on the voltage ranges (cu -rent:
3% DC and 4°/a AO and a 25
PA suspension -type meter with
a nearly 71/3" scale length,there's no doubt that the Model
801 has no equal among ana-
log V -0 -M's in terms of sensitiv-
ity and versatility. And there's an
optional Leakage Adapter ($30)
that measures leakage currents
as low as 1 A.
See the remarkable Model 801
V -O -M - priced at $210 - atyour Triplett distributor. Formore information-or for a free
demonstration-call him or your
Triplett sales representativeright away. Triplett Corpora-tion, Bluffton, Ohio 45817.
MrTRIPLETTThe Worlds most complete Ilse of s...choose the one that's lust right for you
. . . for more details circle 138 on Reader Service Card
r
1 1i06.4 L1069 1.109C 111IE stilt I
Dee Want 110011i4
ELECTRONICTECHNICIAN/DEALER
21-1=L/51COMPLETE MANUFACTURER S'CIRCUIT DIAGRAMSAND TECI-1%1CAL INFORMATION FOR 5 NEW SETS
SCHEMATIC NO. SCHEMATIC NO.
ADMIRAL 1415 MOTOROLA 1419TV Chassis TR2 Color -TV Chassis TS -938 (Additional
Information)CHANNEL MASTER 1416Color -TV Chassis T5001 Series
GENERAL ELECTRICColor TV Chassis L -T2
VHF TUNER 94G281 -1511112-2A
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1415ADMIRALTV Chassis TR2
MAY 1972SYMBOL DESCRIPTION ADMIRAL PART NO.
5208-500K, volume control w/switch ... 75A148-2R320 -25K, video control w/switch 75A1482R418 -height control 75A101.16R422-1 2M. vert hold control 75A100.8R466 -Vert lie control 75A101.17R501 -28n, 7w, late production 61A20.114R502 -5.5i1. fuse type 61A48.1C432-100pf, 4kv, car disc 65A10-212C504A-1500, 165v electrolytic 67A30 10C50413-1500, 150v electrolytic 67A30.10C504C-200uf, 150v electrolytic 67A30-10L202 -quad coil 72A132.77L303, 304 -IF ',former 72A296-7L309 -video peak coil 73A5-20L401 -horia lock coil 94A17 19T201 -audio output ',former 79A1245T303 -sound takeoff ',former 72A185-5T401 -Vert output ',former 79A1394T402 -deflect voke assembly 94A372.1T403-horiz output ',former 79A138-11
a/v
9
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1/217JZ,Ey
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COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
1416CHANNELMASTERColor -TV ChassisT5001 Series
MAY 1972
1,41111111/4111111141111
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6. Horiz. Rote 20V PP
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12. Nor., Rote 205V P -P
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ENNEBEimmillimmulimmsiFLIERIMEIS
24. Vert. Rate 125V P -P
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25. Vert. Rote 13.0V P -P
11111111111n1111111111111111111111101111111111.111111111111111111111111
r..111r ity.virMV ALagmonomil
126. Vett. Rote 0.4V P -P
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27. Horiz. Rote 10.6V P -P
ELECTRONIC L7 rirw=TECHNICIAN/DEALER /
COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS
iiiiiiiill1111' INA If
7. Hor17. Rote 180V P -P
11111111MiiiMMil
EIMMEMMIMIN13. Vert. Rote 120V P -P
MEPI9. Horiz. Rote 60V P -P
8. Vert. Rate 150V P P
MIIM11I111111111111111111111111 111111111111111 11111111111MIIIIIIMMI1111111111mMIMMEMMIMMI
14. Horiz. Rote 300V P -P
*20. Horiz. Rote 165V P -P
1201 L202
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15. Horiz. Rote 2.4V P -P
21. Horiz. Rate 170V P P
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2. Mori:. Rote 14.8V P -P
10. Vert. Rot* 150V P P
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71.45 CAPACITOR ON 161.13.36156 MODEL° ONLY,
-I000
A.L FIESISTANCE mis IN ONUS APE 1/2 WATT210.6 SS 0 THEWS( NOTED.
CAKCITNICE VALUES LESS THAN LO IN Mt8110 AMORE 10 IN PF UNLESS OTHERWISE NOTED.
T511- 7543TS2I TS&TS31 T571
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VOLTAGE READINGS IN BRACKETS
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NITS THEN /ITN A STRONGSORE PROM A COLOR BARGER
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All RESISIOCE VALUES NI CMS
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COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN DEALER I EAST FIRST STREET. DULUTH. MINNESOTA 55802
SYMBOL DESCRIPTION CHANNEL MASTER PART NO. R206 -250K, brite control 40X0585-063R324 -500K, brite range control 40X0590-009
C104A-200 pf , 350v. electrolytic 45X0536.001 R335 750 0. 41 25MHz trap control 40X0590-007C10413-1200, 350v, electrolytic 45X0536001 R338 5K, AGC control 40X0590008C104C-80 uf, 350v. electrolytic 45X0536.001 R528A-50K, vert lin control 40X0614-003C10413-5 of, 50v, electrolytic 45X0536.000 R528B-7 5M, height control 40%0614-003C105A-20 0, 350v, electrolytic 45X0539.001 R7308 -1M, killer control 40X0614-004C1058-200, 350v. electrolytic 45%0539-001 R902-10 n, horiz centering control 40X0619-001C105C -50uf , 50v, electrolytic 45%0539-001 R915 -15M, focus control 40X0618.001R107-100, vert centering 40%0608.001 R916 -40M, HV film .....................43X0451004,R111-10K, pin amp control 40X0577-004 L302 -sound takeoff coil 9A2697 001R204-350 n, contrast control 40X0594003 L308 -coil, 4.5M10 trap 9A2565-000R205 -750K. vert hold control 40X0585048 L501 -coil, hord osc 9A2708.001
1 -101 -power 'dormer 53X0445-002T102 -audio output 'former 51%0249 0017103-vert output 'former 51X0248001
vert output 'former 38A4145000T701 -1st bandpass «former 9A2661.003T702 -2nd bandpass .former 9A2709001T704 -ECO 'dormer 9A2660 0021901-horiz output tdormer 53X0453-001C13 -101 -circuit breaker .2A0610.001RV,101-varistor (white dot or band) .. 43X0456.001RV-901-kar1st. (black & blue dot or bands) 43X0457004RV-1101-vanstor 43X0454.001RT-101 -thermistor 43%0453-001RT-1101-thermistor 43X0455 002
DD --
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coPYRIGHT 1972 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET DULUTH. MINNESOTA 55802
1417GENERALELECTRIC
Color TV Chassis L T2
MAY 1972
LINK
ELECTRONIC f-TWEMTTECHNICUIAMEALER
COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS
300,.OINHFPUT
I-
CI43JERROLD .001TYPE F72/ 75 OHMVHF INPUT
L_TO
3R1551
22V
OoiI. UHF TUNER,
L
T211403 3047ata 1.047
L____
VHF TUNER
T. P.
V2
FIL
SYMBOL DESCRIPTION GENERAL ELECTRIC PART NO. R229 -3.3M, HeightR274 -40K, hi voltage adjust EP49X32
8248-thermistor, 3.8n at 25°C EU14X147 R283 focus 12M EP49X73
R281 -240M, tapped at 40M, focus EP14X33 R558 triple control, 1M, blue screen EP49X33
R404-PTCR, loon cold, 4K hot EP39X4 R561 -1M, green screenR187 -triple control, 9K EP49X49 R563 TM, red screen
green drive C404A-150 pf, 350v EP31X26R188 -9K, blue drive C4048-100 P f. 350vR192 -9K, red drive C404C 800, 300vR196-15011. bright limit EP49X28 C406A-200pf, 200v EP31X27
dual control EP49X31 C4068 2000, 200vR226 -330K, vert lin 5,256 -rectifier, focus 3ma EU57X32
V3 A
1r_ _ _ __ __
__Ic,,,641.25200T
1/2 IIAR11,,,'ST IF 37151
1 II t ;RAP135V - 1135:VV
1
39;951 1 36C01501
sisn.I
I1 -
1 3C; 4 /931.525%
It: 1i1,5v3
-C-431152 ;
T.P. ii
-4 7.2ITRP 31151
__I ir5,4IL I.9loon
I .4-
3914 94709
301.8+140V 1.22 tom
R35933K
AFC MODULEONO, ON ALL MODELS)
CM S%51
4L-
1
1350
C 38747
935111.3K7,9%
C393-.005
UNLESS OTHERWISE NOTED.K 1,000 M-1,004000. CAPACITORS MORE THAN 1 viiiPICAPACITORS LESS THAN lief. RESISTORS ARE 1/7 WM T.
VOLTAGE MEASUREMENTS MADE WITH A VT VII WITH RESYiECTTO CHASSIS. RECEIVER SET FOR NORMAL OPERATION.MEASUREMENTS RAY VARY ±10% AT 120VAL
0303 +2 2VEMITTERFOLLOWER
93529,211
0351ARC AMP
C355345%
C354.001
+280VC366 I -1
C357 C363 10000I27,6% 39 1 CR353
C3622.2
9353220
WHERE ON SIGNAL AND Off -SIGNALMEASUREMENTS DIFFER. ON -SIGNALVOLTAGE APPEARS IN ITALICS OVEROFF -SIGNAL VOLTAGE. OFF -SIGNALVOLTAGES TANEN WITH ANTENNADISCONNECTED AND ANTENNA TERMINALSSHORTED TOGETHER.
IND1CATES VARIATION WITHCONTROL SETTING
INDICATES PRODUCTIONCHANGE
/7V14 5V
FROM0301
C OL LECTORI6.5VI4V
C3561..001 C355
4 112325ii27
1:366
E121"-
-/7V+22V +IV
NEO/N.3
0302ARC
IVo
/39202
al10k
1500 . 330
93551509
40-CR35,
C36110
CR352
C16.4
R357 wk.109
C359 0360.001 .001
3:::'T276
31201
39204
2T400 RED
J4.12-119403 -Iv9410S\I1PART OF VOL CONY 15313)KEY ON MODEL CSNI95Ewo-2LOCK
.1403-9$3402 -3
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58299275
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54
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4- 280V
R302'9
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1 1301T
0 1302
1 4C 303'°°5 47300 1555
1/2 125F11ALIO OFT.
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7
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2.7 R3 6 T .0 4, 9301 4,13.07 00 IC 313
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0501SYNC SEP
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TSC 203
OF 401.6A
FAST BLO
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TO 5R217
571:55C252
5R213 50251 .00122.111 020I .157201
5.01(R212 151t2i4 LT]2700 12Kt511254
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..E.4429401-5
9401-6 I
79404
12.GVAC
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39207
3C 200.22
470
30201+22V
3R204
3R2033K
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21 0
20102.001ISCIVAC
21401
2E4046500350V
Y401
7C403
2F402 I .001
2.34 3407 1500A(
ACI
ACTIVATED
WHEEL "TtSY,PROGIRAM
1
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i380/GRA 310. 1401- 26
3351
2(407
600V
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9401-1 J302-5
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9402-14
940747IW
2C408001150V AC
2R401330K
VII
2C4.00IAV
2940217K229
6443-
19CO3
7 411.005
7(422 105V6p1.3KV
TO29405 +140VIM
CRT FIL
9402-43
2923833029
00**
2C404C
18S'y
27405
2C4064200412000
DC4068200K I200V A
A
1110
.0033 3300 27k5C253 -5R252
115;253
+F2 80V
4280V SOURCE
4260V SOURCE
+22V SOURCE
+140V SOURCE
24111)3
INAS 4097
I3
+150V SOURCE
V9INLAHA
VII
+22V
+ 280V
I.
29320VOLUMELIMIT1_M_ _ pze
V48t,2 scout
390 IF
SC262 1..r.5025112200_L
3.113
1(
050E2*
HON RACT + 2 2V.9V 22V
45 1456I.4V
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SC 25 7 1 .027Sul 3.5V
TS.00.;S079.'5/
!NMI3605.4°I 5156
I .0060
Par*TO
7C276
RASTER BLANKINGS402
TO 4aR52 3 (V7E1)
PIN 10, V5A
GACIO
7 12 I 2
V3FIAR
I
3C419 30418
BOO 800
3C417800
LVHF TUNER
V7641184
40414 40114800 00
0301,03023381 .8 rot0301,0502
0303
913
C1604
I9V
511262itSt.251 330
HONHOLD IA
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It W/25V AEC
ONLY130V
+ 14 OV
I/2V6 1213BFliUCt OUT
4r2itt
Y501-varicap EU30X87L151 -cod, 47.25MHz, trap w/core EP36X13L153-xformer, 1st IF EP61X1L157 coil, choke EP36X7L158 -cod. 4.5MHz, trap EP61X3L161 -delay line EP36X121251 -coil, hora ow EP35X2L301 -cod, audio take off EP36X28L303 -coil. quad EP36X30L400 -cod, line choke EP36X571501 -cod, chroma input EPX36X24T201-xformer, vert out EP64X6
r7. 77..z T PTRAP4 3'153
I 3
(ti
30117330
311517,5
3[168to
3516730164 330
1.5 37152
9164Es,TI. 3.1.51.7 3
1011
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3/157
+150V
40374 4C316105! -r 5000200V
4 280V
0503 0504909. 05.. HON. 0151.
CF)50263
.2VSL
Tvk 2 470 1919
4 22V
180V
Yon RI NT 1 Ix 145 Mt/ Us, WI I to r owuoppi51161110l. 41100111 RS. IHI 141111A iN011,11 S 1HE HOARDON GRASSI'S ARI LOCATION(Ix Rmav 1: 314,01 14501 I 0E4111/ UN ROAIID 31
4/11(91 PREF.t NoI one o. motor,' NI IsON A sin. A hi MOLYIT IL 1111.1 145115 11,111.11 RUNT
COMPONENT LOCATION DIAGRAM
R3I4330
1S01
SPKR SEL
INT BOTH EXT
"2'8 5C2J 'ff
5R76639K
SC26/.047
?0
I
SC267-1
.047 I
TO0301
EMITTER
13[501560
SPIT
< J401-10
(PI 4267100
SR16117705
54769.0055%
4TO 40301
J405-5(
94 05-3<
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ST257
5R2 71 3C1330K .9,0)5% 4 -
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T V413if.. tl. olCNOTOM
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5Itir40971.17
DJ51,276829S.4
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COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 5 5802
7252-xformer, horiz sweep 111VT) EP77X9T300-xformer, audio interstage EP36X34T301-xforrner, audio output EP64X16735I-xformer, AFC discriminator EU61X6T400-xformer, power EP88X3T501-xformer, chrome bandpass EP61 XI73T502-xforiner, crystal. filter ,,,,,,,,,, EP6I X174T503-xformer, chrorna, demodulator EP61X175
circuit breaker IF4001 EP1OX9fuse, 6a, fast blow, F401 EP1OX12fuse, 2.5a, slow blow, F402 EP1OX13Yoke, deflection EP76X2
3CI49200
31158 43,594.5mH2
391683.9K
30173 TPIII1506
3.1V4.1 V
03011ST VIDEO
*1-22V382704 ;31172 3610703
13C.71 114
3,69 I800 4.711
S 3292..7,,..,
26905NOR OUTPUT
-70y
T. 1.
XII
C8M285LWID-TSPKR WIRING
II4T301
AUDII 54056 (/ACTIVATED
.2401-10 1
L MUTEO PROGRAMBY
WHEEL_
L _ _ _ _
150 WITHVARIES
200 BRIGHTNESS
792110711279 68.00 538
5C264
+F280V
I_
180v1""'
PARC PASS170v 3 I
25
cy
J402 -TI
VI33033
H V RECT
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PIN
V 7A
0,,/.2,6,4,..uni3i,
3C 05 1
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2401
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= COLOR =SOO
+ 280V
= 4L51,1
TPA - -
5.6.8
2.5 V3.9V
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P562-5<-
1 t340,1
IC)M401
1
,,,,, POWERTUNE
1MOTOR
I
QBR2139)C911297
ONLY
L e"._ _,
TO 1P401 10 3405
ACTIVATED BYPROGRAM WHEEL
M...OUCOLON MOTOR
(CbR25vI ONLY /
4,A.1401 2W .1401-11
A.1405-2
I ) CHANNEL
4-1:1P405-1
J502-6y ff32-4
3405-44,,Ait
3405-5L1-*
ESS ORE I
61501TINT MOTOR
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C5 4B15.1
3502-1x x1502-33405-6 .1405-7
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4(50680.3
T. E:
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1111, ir 4,....-I
SA
k, _i_1
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1 4,502I_ J TP
25KV TO CRT
ANODE702111
ITAPOIr TO C RTPIN 9
11.(55rUuhTEI
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271
TO 5R25ITo
3C201
VII19103
041428
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71 255=OAK
7,214
445,7690.
05.1111011
MAGENTA/1\e
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1
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03042ND VIDEO
C174470
38176330
4 5V6.4V
/75VI4.9V3R177470
+22V
31141 31182
DELAY L11.24
.3121914"-T Pdpd
+22V31162 BLANK E0R3\0/L5AMP
1113010'0 4019925V 100K
581781006
V5ABAL 9
v.010 Out3. 8V
MAXIMUM MINIMUM44.99 BRITE B CONT BRITE BCC6-96 16'0V 260V
230V 280V
404183 .5V 2 4116442 4R1 270.9 44199IK 10K 3. I. 4TO 3947
5C175005
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5FA793.3K
FROM71201
0541 5R239 514241150 B 92K
XXIX
:43050140513220.
IC 810
6117
5821939011
V9A51206 1/2 161094
390 VERY 031
5C2071- R222
22001411.1
VERT HOLD5E1218
xzzz 5C204
56K
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2 t8OV
11
22
R5e6
41[10T,,o..
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RIOT
C
9902, 270
33 582294100V 3 3N
VERT27K5R223 SIZE
5C2iI022
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1.110,H
ROTet u
690
5C221 TP.033
51219680
5C213047 58232
50224 58229,,7C2121 58228
100KFROM5R27i
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C 902.0132
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5C2I9.0092
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58231 -10V2.2M
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11,414144 RA.
C
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180
MN
RID?
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1
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8810
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I0.3V 9 245V
2.2KI/ to 90V , 5%r11- -
'SO.
48519111001/4 IN
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411501
40128tow
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I 10P1
111156
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4115231.01 47K
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411169
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77201250V VERT OUT
T 0245V eLu
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245V235Y
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1500
1811,88
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1L50:11-*56
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41522 4E15274L506 3654411 5% IK
1-175.07-/56.1 41523 4R521q36 IK
5% 5%
4L51141503 5.60,
4L51247504
4R529,.0 4150541.500 /5124
01201
L257
.181929KRED CNN,
GENERAL ELECTRICColor -TV ChassisL -T2
NOTE CRT SOCKE T HS IluiLT SPRKGAP USE ()KILT E TtC TRERL ACEMENT PRT
J
2R5312 21( 4R532
2KBLUE BAL
4L5I76600
R5332.2K
T P-1-x-vrr
R5342.2K
4165372.2K
485362K
4K Vic/
L._VI2
tEEMIME
TO 7R281
411530
11001
REETBAL '4L518-1-690Lon
T p
90V69542
332%
r P xLx
29
T
25KV
54559m 59563
IM5C533 RED SCR
.1470
56564.4.
395A.
-- SC 536470
900ST
*80051
GRIT SCR
5R5621M 5R558vv,
-51534 113u.S,4
.1.470 9R5571106
+280v
41507.0064
405412,04
L 8 A3 6.6C
V 8C/3 64(.10
C555.01
48558.1V
+ 280v
41531 -I65V
11855.2208
15
+ 280v
220
40547
I65V
40552278ILY
I65V
C529.039
4 9546561
'73:4
15252.4
4 9533308
4C526
I xv
COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN,DEALER I EAST FIRST STREET. DULUTH. MINNESOTA 55802
1418ZENITHColor TV Chassis14CC14Z
CABLEJAC TO
TUNER
MAY 1972
ELECTRONIC L7 i -7 V[=3 SYMBOL DESCRIPTION ZENITH PART NO. 6298-7M, vert size controlR299-theymistor
63 643363-6824
234 -filter chokeT201-vert output xformer
95 273395.2924
TECHNICIAN/DEALER / C208A 100 electrolytic cap 350v 8307-2K, vert line control 63.7983 7203 -sound output xformer 95 2688
C2086 -40 electrolytic cap 350v 22-6312 6320 voltage dependent resistor 63-7143 T204 -deflect yoke 95 2781
C208C 4 o f electrolytic cap 350v 6351-75021. buzz control .. 63 6487 T206 -filament xformer 95.2944
C20813-200pf electrolytic cap 35v 6378 -voltage dependent resistor 63.7658 T207--hora sweep 'dormer S-85571
C319-300pf electrolytic cap 30011 - 22-5748 6388-therrnistor 63.8687 A201 -integrator unit 87.7
COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMS C321A-270pf electrolytic cap 350v 6390-3M, HV control 63.8460 A202 -6/C network 105 104
AND TECHNICAL INFORMATION FOR 5 NEW SETS C3216-150 pf electrolytic cap 35$00 22 5746 6396 -voltage dependent resistor 637658 F201 -heater fuse link 2Y., in mon. loop ofR221 -IM bright control , 63-7974 L103-47 25MHz trap cod assembly 20-1669 24 lb AWG copper wore 91 2061
R251 - 15M focus control ................... 63-9013 L204 -delay line S-80475 F202 -.50a belfuse 136 84
6254- 500 0, AGC delay control .................. 63.8543 L209 -sound take off cod $77414 F203 -2.7a bel fuse 136-76
6283-5K, AGC level control ..................... 63-7976 L224 -quad coil S-80480 F204-.35 bel fuse 13675
6294-750K, vert hold control . .. ............. 63.7973 L226-horiz osc coil S56877 VHF Tuner used in Model 175-1402C351066
FPI : ALL 41 P. ASSIMIK, .BEIN MIT MILE Si OT.415152 452 C.5110
ST. 1'COIL
L 1015
CO
0"A 2555
0202121-499I.F.-A.G.C.
TO VIITUNER
11
C,0554,54(.25m
.021
240
047)3
C
0101121-500 OR121-501 OR121-505 OR 121-5031 ST. I.F.
fo.-rt 14.4y
' 1
V203A1/2 6MV8SOUND- SYNC8 A G.C. AMP.
2 N0 7. rCOIL
0.034 .L.011
5.05
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0102121-502 OR121-506 OR121-470 OR 121-5042 ND I.F.
CIO
0103121-5243 RD.I.F.
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I5%
C$3.1CIF
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J
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1
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1
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306
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1
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saw
V202 ATo 0229 1/2 94H9,ot
"Y. AMP.
1
0201 III!121-587 ereiGmTNESS sine
VIDEODRIVER
211
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6270%,
520 2 - OOT
0400
17'°`250
!It" I Fa?giLCTO4
17 tti?
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CONTRAST
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02341
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p2TI .1.C2511
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2.
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V20381/2 GUYSSOUND LIM.
ciT V207A" 1/2 10210- SOUNDDISCR.C.2,14I 25f.
I
500C
2700
V20941/3 6U10HORIZ. CONTROL
y5005
0.204
Carl.C5207
002
War
0000
I -IV
V209E11/3 6U10HOR1Z. OSC
10532-12
IEy~R-
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=001.
5311- 111!R,T/vE,
-1/-6-1 Bir
L224
2 OV
5351.
2,0v
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530111.2*
534455
VOL
1)
4ii5
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COWTAOL
011022
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0204vOL,ArE
PLUG
V20761/2 10710SOUNDOUTPUT
25.
V2I02OLF6 OR
vo out T C204MC 0324 AT C5203
26L X6 33A .HORIZ.OUTPUT Cvn,.
-
.514,1N
V20541/2 15108
Prot/VERT. OSC.
II
52525304
152112 2ME4
0051MOLL
V20591/2 ISMFBVEPT.OUTPUT
5,1441
/iiio sAti
/new7'
e.,! 2 dMI.
C273039
J. 11-41
.Stii7Tgn :g'
TOK
7-1 VERT,V C2MI IN.
*NT/ °RN
MIN
207
II 396 C,20 Pr25v
5314
5302 7510
2
00 0515 7205
55v1--5513223
,53110.N)5(0
'ADJUST
Golfi20 Pr
53215312 /MEG
4105
215 CVI TO CRT I
eV2I219CG3DAMPER
LIZ,
V2I13DJ 3,30133 OR3DC3
RECT.
Qm2zov
r000
4102
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052014
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RESISTANCE MEASUREMENTS SHOWN WIT. COILS DISCONNECTED FROM EINEu,,
ALL RESISTORS ARE 1,10% TOL E RANCE CARSON. 112 WATT UNLESS OTNERTFISESPECIFIED
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ALL CAPACITOR VALUES 01 M1CROFARADS UNLESS OTHERWISE SPECIFY D
FOR CAPACITOR TOL FRANC(,SEE L GENO
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0- INDICATES ALIGNMENT B TEST POINT.
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INDICATES CHASSIS GROUND .4)- INDICATES CONNECTORS
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INDICATES INSULATED IIRACKET GRDUNC PLANE
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COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
1419MOTOROLAColor -TV ChassisTS -938 (AdditionalInformation)
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MAY 1972
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ELECTRONIC 1-7 FTW=1-TECHNICIAN/DEALER /
COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS
MUSS 0110.10 AMON VI. OICIAL ALAS PI r, ALL OARS w If2 NISI SANS All Ilk AII. 101CARS 2011010S tr.
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ELECTRONIC TECHNICIAN/DEALER is pub-lished monthly by HARCOURT BRACE JO-VANOVICH PUBLICATIONS.'INC., 1 East FirstSt., Duluth, Minn. 55802. Subscription rates:One year $6, two years $10, three years $13,in the United States and Canada. Other coun-tries: One year $15, two years $24, threeyears $30. Single copies 750 in the UnitedStates, and $2 in other countries. Secondclass postage paid at Dansville, New Yorkand at additional mailing offices. Copyright1972 by HARCOURT BRACE JOVANOVICHPUBLICATIONS, INC.POSTMASTER: Send Form 3579 to ELEC-TRONIC TECHNICIAN/DEALER, HARCOURTBRACE JOVANOVICH PUBLICATIONS, INC.,I East First St., Duluth, Minn. 55802.
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COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN DEALER 1 EAST FIRST STREET. DULUTH, MINNESOTA 55802
TV TUNER SERVICEVHF, UHF, FM or IF-Subchassis...
. . . All Makes
You owe it to yourselfto try P.T.S. We are the fastest growing, oldest and now thelargest tuner service company in the world. Here is whatyou get:
1. Fastest Service -- 8 hr. in and out the same day. Overnighttransit to one of our six plants, for parts, tuners or IF -modules.
2. AU tuners cleaned inside and out, repaired, realigned and airtested.
3. On IF -modules all stages checked, all trap set with high calibretest equipment.
4. Fine Quality! Your customers are satisfied and you are notbothered with returning your units for rework!
5. Lower Cost! Up to $5.50 less than other tuner companies!6. Friendly, helpful personalized service!
1 YEAR GUARANTEE
FIRST TO OFFER 365 -DAY GUARANTEE!COLOR-BLACK & WHITE-TRANSISTOR TUNERS-ALL MAKESGUARANTEED COLOR ALIGNMENT --NO ADDITIONAL CHARGE
We offer you finer, faster...
Precision. ...Tuner Service
LIKE TO DO IT YOURSELF?PTS makes all tuner parts available to you.Send one dollar (redeemable) for ourTUNER REPLACEMENT GUIDE AND PARTS CATALOG EAST-
WEST COAST-
VHF-UHF-FM $ 9.95UV -COMBO $16.95IF -MODULE $12.50
Major Parts charged at Net Price
CUSTOMIZED REPLACEMENTS AVAILABLEFOR $12.95 UP (NEW OR REBUILT)
For fastest service, send faulty unit with ubes, shields and all broken parts to
PTS ELECTRONICS, INC.HOME OFFICE-P. O. Box 272-Bloomington, Ind. 17101
P.O. Box 3189-Springfield. Mass. 01103P.O. Box 41354-Sarramento, Calif. 95841
060 pages of top information *Blow-up of all tuners *Largest MOUNTAIN- P. 0. Box 4145-Denver, Colo. 80204exact tuner replacement guide *Antenna Coil Replacement Guide SOUTHWEST- P. 0. Box 7332-Longview. Tex. 75601*Multi -fit Replacement Tuner Shaft Guide SOUTHEAST- P. 0. Box 6771-Jaessonville, Fla. 32205
... for more details circle 133 on Reader Service Card
Tel. 812/824-9331Tel. 413/734-2737Tel. 916/482-6220Tel. 303/244-2814Tel. 214/753-1334Tel. 904/389-9952
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 19
PHILLIP DAHLEN, C.E.T.Editor1 East First StreetDuluth, Minn. 55802(218) 727-8511
ALFRED A. MENEGUSPublisher757 Third AvenueNew York, N.Y. 10017(212) 572-4838(212) 572-4839
TOM GRENEYPublishing DirectorJOSEPH ZAUHARManaging EditorBERNICE GEISERTAssociate EditorGAYNELLE DAVIDSONProduction ManagerJOHN PASZAKGraphic DesignLILLIE PEARSONCirculation FulfillmentJOHN KESSLERManager, Reader Services
MANAGERS
JIM SMITH, C.E.T.43 East Ohio StreetChicago, Ill. 60611(312) 467-0670
CHUCK CUMMINGSAd Space South/West613 North O'ConnorIrving, Texas 75060(214) 253-8678
KEN JORDANDONALD D. HOUSTON1901 West 8th StreetLos Angeles, Calif. 90057(213) 483-8530
CHARLES S. HARRISONCY JOBSON57 Post StreetSan Francisco, Calif. 94104(415) 392-6794
ROBERT UPTONTokyo, JapanC.P.O., Box 1717
ELECTRONICTECHNICIAN/DEALER
MAY 1972 VOLUME 94 NUMBER 5
The TV reception scene on this month's cover is provided through the courtesy of Jerrold
Electronics Corp. More concerning successful antenna installations is included in thearticle beginning on page 44.
3 TEKFAX: Up-to-date schematics for easier servicing.
23 EDITORIAL: Stop the Clock!
24 LETTERS: Pertinent comments concerning past issues.
28 READER'S AID: What you need or have for sale.
30 NEWS: Events of interest to our industry.
34 NEW AND NOTEWORTHY: Merchandise of special interest.
FEATURES
39 TEKLAB REPORTOur observation of interesting circuitry encountered in Channel Master's Model6124A Modular Color -TV set.
44
50
57
60
PROFESSIONAL ANTENNA INSTALLATION METHODSSome helpful hints on how to increase your revenue with the installation of qualityantenna systems by Bert Wolf.
WORKING WITH COMMERCIAL -AUDIO EQUIPMENTPart III in this series by Jack Hobbs is concerned with the successful applicationof multi -speaker systems.
SELECTING THAT PARTNERNext to marriage, selecting an appropriate business partner is one of your mostcritical decisions that you may ever make.
TEST INSTRUMENT REPORTReviewing specifications for Dynascan's B & K Model 1465 Triggered -Sweep Scopewith Cali -Brain.
66 COLORFAX: Tips for easier color -TV set repair.
68 TECHNICAL DIGEST: Hints and shortcuts for more effective servicing.
70 NEW PRODUCTS: Instruments and components to make your job easier.
74 DEALER SHOWCASE: These items may increase your sales revenue.
79 TECHNICAL LITERATURE: Informative material that you may need.
80 ADVERTISER'S INDEX: Manufacturers concerned about you.
81 READER'S SERVICE: A source of additional information.
Lou], A HARCOURT BRACE JOVANOVICH PUBLICATION Tit45
HARCOURT BRACE JOVANOVICH PUBLICATIONS: James Milholland, Jr., Chairman; Robert L. Edgell,President; Lars Fladmark, Senior Vice President; Richard Moeller, Treasurer; John G. Reynolds,Vice President; Thomas Greney, Vice President; Ezra Pincus, Vice President; Bruce B. Howat, VicePresident; James Gherna, Vice President.
ELECTRONIC TECHNICIAN/DEALER is published monthly by Harcourt Brace Jovanovich Publications.Corporate Offices: 757 Third Avenue, New York, New York 10017. Advertising Offices: 43 EastOhio Street, Chicago, Illinois 60611 and 757 Third Avenue, New York, New York 10017. Editorial,Accounting, Ad Production and Circulation Offices: 1 East First Street, Duluth, Minnesota 55802.Subscription rates: One year $6, two years $10, three years $13, in the United States and Canada.Other countries: one year $15, two years $24, three years $30. Single copies: 75C in the U.S.and Canada; all other countries $2. Second class postage paid at Dansville, New York 14437.Copyright (s) 1972 by Harcourt Brace Jovanovich, Inc.
POSTMASTER: Send form 3579 to ELECTRONIC TECHNICIAN/DEALER, P.O. Box 6016, Duluth,Minnesota 55802.
20 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
If you're the kind of guy who likes to devise his ownequipment or the kind who appreciates clever me-chanical design, then Mallory do -your -thing productsare for you.
They'll let you invent, create, modify, so things workyour way. And of course, you'll get famous Mallory
quality and performance you cancount on too. Ge-. them at yournearby Mallory Distributor.
AUTOMOBILEREMINDER ALARMEver leave your lights on?Never again ... with solid-state Sonalert". Its shrillsound warns you, preventsbattery drain. Use on turn sig-nals, reverse gear ... or anyelectrical component on yourcar, truck, boat, tractor. For6 and 12 volt.
CONTROLYOUR TIMEUse "Easy Time" 24 -hourtimer. Turns anything youplug into it on and off. Ap-pliances, lights, pumps,motors, humidifiers...you name it. Toughenough to handle 12amps, 1500 watts.
HIGHINTENSITYNOISE
Compact,- purse -size,big -soundHandy Blast...your personalalarm. Use it foranything...boat horn,emergencies,scare muggers,signals, callkids, scouting,bicycling...even cheer yourteam.
ON -THE -GO GROOMINGFree yourself from conventional, bulkyshaving gear. Handy Shaver . . . it'sabout the size of a cigarette pack. Hi -speed, quiet, 3 -volt motor for fast, no -pull shaving. Comes with Duracell"batteries, mirror cap and tough carry-ing case. Also available in new side-burn trimmer model.
SILENT PROTECTIONCrime Alert" ... uses invisible, silent ultrasonic sound -
waves. Anything thatmoves triggers itspiercing alarm. Useanywhere ... batteryor plug in. Acces-sories to make it to-tal security system.
SOUND WHERE YOU WANT ITThe most popular, portable recorder/player around. Batteries or plug in. Push-button operation, pop-up ejection,automatic shut off. With sensitive
dynamic mike, earphone, Duratape"cassette, Duracell" alkaline batteries.Ask for the MCR 1211.
MALLORYMALLORY DISTRI 13UTOR PRODUCTS COMPANY
cliviMon of P. R. MALLORY & CO !Nu.Box 1284. Indianapolis, Indiana 46208: Telephone: 317-836-15353
. . . for more details circle 130 on Reader Service Card
MAY 1972, ELECTRONIC TECHNICIAN/DEALER ! 21
Fast heat-up. The Weller' AutomaticGlue Gun heats up nearly three times faster thanthe other gun. And an indicator/work light tellswhen it's ready. Your customers get hot glueinstead of getting hot under the collar.
Fastoof,luing. Our Gun is slim, well-balancedand g -looking. There's no awkward trigger tosqueeze because glue feeds automatically. There'sno mess because our tip is dripless. And in recenttests, we found that Weller glue sticks bond betterthan any other glue sticks around.
Fast selling. Dealers everywhere arediscovering that our glue gun really moves. It'seasy to promote because our 50/50 Co-op programsupplies you with everything you need. And withWeller, you sell a kit, not just a gun. A complete kit(gun, glue, caulk, instruction book, stand andcarrying case) that won an award for excellencein package design.
Quick! Join the Group.The Cooper Group is Crescent, Lufkinand Weller. Top -name, top -profit productsthat are backed by strong consumeradvertising and publicity campaigns, ourCertified Dealer Program and modernmerchandising techniques.If you're looking for the fastest profits in
town, contact your distributor, orThe Cooper Group, P.O. Box 728,Apex, No. Carolina 27502.
41COOPERINDUSTRIES
18eSeCOnd
WellerAutomaticGlue Gun Fait
TheCooperGroupCRESCENT. WFIGNWELLER
... for more details circle 110 on Reader Service Card
STOP THE CLOCK!
Some of our readers haveaccused us of being somehowpartly responsible for ourgalloping technology. They feelthat on a few occasions thiseditorial column has actuallyhelped encourage manufactur-ers to rush out wild newcircuitry for consumer elec-tronic products-circuitry whichshould actually be set bakingfor the next 10 years in afactory storeroom until all the
"bugs" are exterminated. These electronic technicians wouldthen have ample time to catch up with the technology andall servicing jobs would be "quick and simple."
Although we do admit that manufacturers do read this column,as evidenced by the giant reprinting job that Motorolarecently did of the January editorial (note this month'seditorial photo), we must realize that it is not technicalpublications such as ELECTRONIC TECHNICIAN/DEALER but
rather competitive forces that are causing manufacturers torush to the market with their latest developments in electroniccircuitry. Some of these developments represent tremendous
improvement. And if one manufacturer waits toolong to perfect a new circuit, then the potential customersturn to another manufacturer that has a more advancedproduct on the market.
These manufacturers serve a very fickle public that demandsthe most impressive products immediately without regardto future servicing. This becomes quite obvious when customerscome into the shop with a relatively new piece of "junk" ofunknown origin-either an imported or domestic product-and become indignant when they discover that you are unableto stretch between layers of components far enough to evenreach the suspected defective component, let alone identifyit for replacement or check it against a schematic. Thereis only one appropriate place for such garbage-it should bestripped off the shelves of the discount houses and otherretailers and deposited where it belongs-in the trashcans out back!
But reputable manufacturers are concerned with serviceability.That is why you see modular circuitry being used to makesolid-state servicing easier. That is why manufacturers arebeginning to call upon the professional electronic serviceassociations for suggested product changes that will offereven greater future serviceability.
As much as we might like to stop the clock and catch ourbreath, we find that we can't. Since dragging our feet won'thelp, and since our readers can always find service tips onthe maintenance of old circuitry in back issues, current issuesof ELECTRONIC TECHNICIAN/DEALER must be concernedwith the task of preparing ourselves for tomorrow's rat race.
EDITORIAL
At the recent IEEE Show in New York City, I was able toobserve and operate some products that represent what we willbe encountering. Hewlett Packard exhibited for our use theirnew hand-held electronic calculator, the H -P 35, that usesbut five IC's-three of which generate (rather than remember)to 10 significant figures the value of logarithms,trigonometric functions, plus other functions, for instantaneouscalculations. All of these features, yet it sells for only $395.
By pressing a sequence of digits, I was able to digitally tuneHeath's new AJ-1510 FM Stereo Tuner, a "computer tuner" nowon the market that contains 55 IC's, 50 discrete transistors,50 signal diodes and sells for $539.95 in kit form. (TheJuly audio report is concerned with Magnavox's newAM/FM receiver which digitally displays the frequency towhich it is tuned on either band. We have found this far moreconvenient and reliable than the conventional tuning dial.)
If our technology continues its present course, and if the FCCand various pressure groups permit, then I predict thatthe following technological advances will have occurred withinthe next 10 to 15 years:
All dynamic components in consumer and commercialelectronic circuitry, except for high -power applications, will becontained in some form of integrated circuitry. The useof scopes and multimeters will generally be restricted totesting "older" consumer electronic products, since all newtesting will be done with clips attached to a hand-heldcalculator. It will compare voltages and signal conditionswith what is considered proper by an internal memory bank,the appropriate memory circuits being selected by themodule under test, and the instrument indicating the conditionof that module-specifying any defects present. IFcircuits will be self-adjusting for best alignment. Three-dimensional color -TV hologram pictures will be the rage-thepictures resulting from interference patterns that form aslaser light reflected off a liquid crystal display is combined withthe light emitted directly from the laser. Solid-state memorycircuitry will assist in permitting the formation of far densercolor -TV pictures that seem as sharp as photographs. Although virtually all homes and apartments will contain MATVsystems, which will permit the use of CCTV, the economicaldirect reception of satellite TV transmissions will resultin the decline of CATV systems-two-way video communicationsbeing handled by the local telephone company.
There was a lot to learn as we switched from tube to transistorcircuitry, but with the rapid development of economical,extremely sophisticated IC's, the hands of that clock havebegun turning even faster. Although ELECTRONIC TECHNICIAN/DEALER will continue its efforts in remaining current withthese transitions, only those open to strong technicalpublication support, manufacturer support and professionalassociation support can ever hope to survive.
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 123
YourCentralab
distributor hasjust the right one,
or all of them
Your Centralab distributor hasthe most complete line of ce-ramic capacitors available.He's your best supplier of justthe right capacitor for fast,reliable replacement service.
Choose from low voltage,transistor circuit, general pur-pose, high voltage and Gap-KapTM Ceramic disc capacitors.Available with voltage ratingsfrom 3 V to 6000 V, in valuesfrom .75 pF to 2.2 mF.
Your Centralab distributorstocks other highly reliable,special purpose ceramic capacitors including feed-thru, variable trimmer and transmittingtypes. He's also your sourcefor a wide range of polystyrenecapacitors and miniature electrolytics in both axial and PClead styles. Check your partsstock, then call your Centralabdistributor. He has just thecapacitors you need.
DISTRIBUTOR PRODUCTS
MINIM&MINIM=
CENTRALABElectronics DivisionGLOBE -UNION INC.
LETTERS
Reader comments concerning past
feature articles, Editor's Memos, previousreader responses or other subjects ofinterest to the industry.
March Issue Pleasant SurpriseWhat a pleasant, unexpected sur-
prise to receive my March issue ofET/ D and see, right on the front cov-er in living color, "M.L." and "Babe"Finneburgh. We consider Mr. andMrs. Finneburgh, Sr., to be "personalfriends" of ours; but we are aware thatthere are literally thousands of otherfortunate persons who also considerthemselves as "personal friends" ofthese wonderful people. It is part ofthe magic surrounding "Babe" and"M.L." that they are indeed personalfriends to countless numbers of peo-ple. They befriend-by way of theirfaith and praise and uncompromisingloyalty-executives of the largest cor-porations as well as "little people" likeus who have been privileged to ob-serve the two of them displaying theirown specialized, inspirational talent.
The two pages within that issue(pages 46 and 47), which you devoteto capsulizing the highlights of someof M.L.'s achievements is accuratelyand tastefully done, but I would liketo point out a couple of other signifi-cant contributions that he has made tohelp those engaged in the business ofproviding "independent" service.
Mr. M. L. Finneburgh, Sr., not onlyprovided the spark for the creation ofthe "Superior Independent Service"(S.1.S.) campaigns at the NEA na-tional convention in St. Louis (July1970), he also contributed the bulk ofthe beginning funds, served as fundtrustee and advertising manager, anddonated the Finney Company to pro-vide promotional materials for themost massive collective advertisingcampaign that Independent Servicecould muster. While doing this, heclimbed out on the proverbial limb topersonally call to task those giantmanufacturing corporations that hadelected to invade the field of all -brandselectronic service. There are many ofLs who believe that without the unityof purpose created within the indepen-dent service industry by the magnifi-cent efforts of M. L. Finneburgh, Sr.,ServiceAmerica would not yet havemade the decision to "close up shop"-and that the field of all -brands ser-vice would now or very soon be in-vaded by every major manufacturer inthe country.
To the other activities you have no-ted, it should be added that M.L. wasone of the few persons to actually par-
ticipate in the very first formative ses-sion of the Electronics Industry Coun-cil (also in St. Louis in July 1970)
and is a most active participant in theNational Electronics Service Confer-ences.
He dynamically champions not onlythe cause of independent service andtheir once fractional and duplicativetrade associations, but has also beenan effective catalyst for increased co-operation and unity between thesenewly respected representatives of themore actively concerned members ofthe trade.
Anyone connected with the highestprinciples of "independent" (or inter-dependent) service can truthfullyclaim that M.L. is their personalfriend. No better display of reciprocalfriendship could be made by a servicedealer than to join M.L. in becominga member of either NATESA or NEA(or both) and by promoting increasedunity and more effective representationof the industry. by these national "self-service" associations.
Mr. Dahlen, your March issue ofET/ D has paid a well -deserved tributeto two truly great and gracious"Friends of Service" and has againdisplayed to us that you and your"new" magazine are also deserving ofrecognition as a "Friend of Service."Thank you.
BOB AND ANITA HARRISON
Congratulations onFinneburgh Coverage
Congratulations on your wonderfuleditorial of Morris L. Finneburgh, Sr.,and his lovely wife Frieda, in theMarch 1972 issue. To do justice tothis wonderful couple would no doubttake up every page of one of yourmagazines. It is too bad that so manyget your magazine and yet so few ac-tually read it. This is one of thoseproblems that we have no control over.We cannot force people to read.
I am not referring to just your pub-lication, this is true with all publica-tions. Electronic technicians are toobusy trying to repair a challengingtough dog without proper compensa-tion, thus they have no time to readarticles that no doubt would help thetough dogs become just another rou-tine repair job.
During the past two years, I havevisited over a thousand shops up anddown the east coast and have foundthat your last three paragraphs [in theMarch article] hits the nail on thehead.
The wonderful offer that M.L. madeavailable to all who joined NATESAor NEA-that these people would re -
continued on page 26. for more details circle 107 en Reader Service Card
24 ELECTRONIC TECHNICIAN/DEALER, MAY 1972
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A must for checking all capacitors, the TO -6 is moderately priced,yet offers laboratory quality and accuracy.
See the TO -6 TEL-OHMIKE in action at your SpragueDistributor Today . . . or, for more information, writeto Sprague Products Company, 65 Marshall Street,North Adams, Mass. 01247.
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LETTERS ...continued from page 24
ceive a $35.00 gift certificate at whole-sale value, thus paying for a year'sdues to either national, the first 500NATESA and 500 NEA new mem-bers, a total of 1000-was appreciatedby both headquarters.
This offer did not involve only$35,000.00, it also involved the costof advertising, etc., which no doubtwould be an additional $15,000.00.Thus we can say that the wonderfulchampion of independent service,Morris L. Finneburgh, Sr., has spentabout $50,000.00 to help service tech-nicians across the country get the greatbenefits derived from belonging to anational association.
Phil, keep up this wonderful workon your editorials, they are appreci-ated.
Letters: "You Cheat Em-I'll Ser-vice Em," by Tom Thomas, CET.Tom writes an interesting article, butnever mentions what he gets for all theservice he renders. I wonder if this isdone without compensation. if so, heis just as guilty as the one he calls acheat. If he charges for his servicesas he should, then I take my hat off tohim. I do not agree with him concern-ing self -regulation.
LEO P. SHUMAVONPRESIDENT OF NATESA
They Had It Coming to ThemI just received the March issue of
ET/ D and feel compelled to let youknow that your front cover on thisissue is the best ever!!!! I think it'sgreat and is a wonderful tribute to atruly OUTSTANDING gentleman andhis beautiful and gracious LADY. . . .
Thanks to you and your fine staff fora really magnificent "expose" that wasamply justified.
I would also again like to expressmy appreciation and gratitude to youand your staff for all the fine publicitythat you gave us for the 1971NATESA Convention in Hot Springsand for the many, many "plugs" thatyou are including in each issue on thejoint NEA-NATESA Convention inNew Orleans. I have been a subscriberto your fine publication since its in-ception and have always considered itas "the" magazine for professionals. . . but in the last few months, withall the fine editorials urging servicers(your readers) to join a professionalassociation . . . just bears out that mychoice was a good one . . . and now,even more so!
LEROY RAGSDALEIMMEDIATE -PAST PRESIDENT,
NATESA
In addition to these letters thankingus for our coverage of Morris andFrieda Finneburgh, we have receivedcarbon copies of other letters directedto them, offering congratulations forthe coverage received. We have alsoreceived letters requesting anothercopy of our March cover so that someof our readers can frame their ownpicture of this greatly admired couple.Ed.
Meeting X -Ray Hazard
Regarding the attached clipping onx-ray radiation, what do you recom-mend as a useful go/no-go instrumentfor telling our TV viewers that thehazard is at a minimum?
I think all your readers would alsolike to know.
A. I. MALTBYIn the newspaper clipping attached
to the letter, it reported a Departmentof Health, Education and Welfare(HEW) announcement that customersneed not worry about radiation emis-sion from new TV sets. It quoted theHEW as saying that viewers of olderTV sets, concerned about x-ray leak-age, may call trained servicemen.
Upon receipt of this letter, wewrote the HEW and asked them whatour readers might do in checking forthis radiation. Their letter is as fol-lows:
In response to your letter of Octo-ber 8, 1971, to Mr. John Villforth,Director, Bureau of RadiologicalHealth, I am pleased to provide thefollowing information on actions thatelectronic technicians may take to as-sure that older TV receivers are notemitting excessive x radiation.
To detect radiation from a receiver,the technician may wish to purchase amulti -tube gm instrument such asthose manufactured by Victoreen In-strument Co., Cleveland, Ohio, or byWm. B. Johnson Associates, Mont-rose, N.J. These instruments sell forin excess of $500.00. The technicianmay wish instead to construct a single -tube instrument according to the en-closed Division of Electronic Productreport. This should cost around$50.00 for parts.
Another most important instrumentfor technicians is a high -voltage probe,which can be used to measure CRTsecond -anode voltage. The high volt-age of the receiver should be set nohigher than that recommended by theTV -set manufacturer.
When rectifiers and shunt regulatortubes require replacement, they shouldbe replaced with tubes which haveradiation ratings. Examples of this aresubstituting 3A3C for 3A3, 1X2C for
continued on page 78
26 ! ELECTRONIC TECHNICIAN/DEALER, MAY 1972
What do RCA SK series devices havethat other replacements don't?
SOLID-STATEHARDWARE
10 sockets for transistors and IC's 15 heat sinks from TO -18 to
TO -3 package styles
QUALITYPRODUCT
Top -of -the -line quality Meet -or -beat specs 23 niw types Now 120 SKs replacemore than 46,000devices
All three make up the RCA Solid -State System - aproduct and back-up approach to a replacement line ofdevices with the professional technician and service dealers'needs in mind. You put the elements together - and theywork. Product is top -of -the -line. Literature is accurate andcomprehensive, and hardware helps in your day-to-dayservicing.
Remember, RCA's Solid -State System is based onpremium product - more than 120 different devices (in-cluding 23 brand new ones) that can replace more than46,000 units, both foreign and domestic. They cover thefull range of replacement needs - from small signal types,integrated circuits, insulated gate and junction type FErs,
INFORMATIONSUPPORT
Accurate Comprehensive New SK Replacement Guide New SK Wall Chart Transistor Tape/Slide Educational Shows
Manuals
to the newest silicon audio 100 -watt output types.Designed especially for replacement use, RCA SK
units are backed by electrical characteristics that makethem comparable to or better than original devices. Thereare no cast-offs or factory seconds.
All units and the types they replace are cross-refer-enced in the RCA Replacement Guide, SPG-202M. There'sa Quick -Selection Wall Chart, too, 1L1367A, and newAudio -Visual service aids. These spell the industry's finestinformational backup for replacements - all SK, all avail-able from your RCA Distributor. See him today for yourcopies.
RCA Electronic Components !Harrison I N.J. 07029.
RailElectronicComponents
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 127
READERS' AID
Space contributed to help serve thepersonal needs of you, our readers.
Back Issues RequestedI would like to purchase one set of
back issues of ELECTRONIC TECHNI-CIAN/DEALER magazine with TEKFAXschematics up to and including June,1971. Please let me know your inclu-sive issue dates.
LAURENCE G. HOTCHKISS2562 Mountain View DriveEscondido, Calif. 92025
Service Publications AvailableI have some old service pub-
lications which are fast vanishingfrom the haunts of man, and I wouldlike to find a home for them withsomeone who can appreciate theirworth. First, is a Rider's Abridged,volumes 1 to 5 in one book. I alsohave Rider's volumes VI, IX, XI, andXII. Roughly, the number of thevolume indicates the years of radiomodels included. This starts with 1931and works up to 1942. Second. I have
volumes on RCA radios as follows:1923-1928, 1931-1932, 1933, 1935,1938 and 1940. Total 7. Third, I havethe official GE manual covering 1930to 1935. Lastly, I have a tungsol tubemanual issued in 1948. This containsmany forgotten tube types and theirlayouts. I will sell these reasonably.
HARRY L. MATSINGER6134 Spruce St.Philadelphia, Pa. 19139
Tekfax Requested1 am already in possession of Tek-
fax books of schematics 109 and 110.I would like to have the complete col-lection of these books and would ap-preciate if anyone interested in sell-ing No. 101 through No. 108 wouldadvise availability and cost.
EUSEBIO C. GARCIA444 SW -10 St. (Apt 4)Miami, Fla. 33130
I need the following Tekfax: Janu-ary, 1969 through October, 1970.Please write fee desired.
GAI.EN D. MOHUNDRO722 BerkshireEast Alton, Ill. 62024
Use this unique, completetest facility free for 30 days!
Versatile all -in -one precision test unit Sine wave generator Millivoltmeter Wow & Flutter bridge Harmonic distortion analyzer
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Use it anywhere Recording & broadcasting studios Testing laboratories Service shops Compact, portable, lightweightAll this for only $1200.Sturdy carrying case optional
FERROGRAPH RTS-1
RETURN COUPON BELOW FOR FREE TRIAL OFFER
Yes I'm interestedin the FerrographRTS-1 test facility.Send details andqualification form.
(1 I am interestedin a distributorship.Please send details.
ELPA MARKETING INDUSTRIES, INC., New Hyde Park, N.Y. 11040
NAME
TITLE_
COMPANY -
ADDRESS CITY STATE
ETD -3
7IP
Prints AvailableI have quite a tew Atwater Kent
Prints from Model No. 9 through No.4660 (hit and miss to models 936).These cover from 1928 to 1935. 1 amnot in the resale print business, but ifanyone needs one, please send $1.00and a self-addressed stamped envelopeand I will try to send the copy of themodel needed.
HURSE E. JEFFERS712 Hill StreetKingston, Tenn. 37763
Equipment for SaleI have several pieces of test equip-
ment that range from a bias box to asweep generator. For a price listingsend a stamped self-addressed enve-lope.
GEORGE D. JENKINS2323 B WoodsonOverland, Mo. 63114
Schematic RequestedI have in my possession an Atwa-
ter Kent radio, Model No. 33, SerialNo. 209848. I require a manual and/or a schematic. I also would considerselling it for the right price.
MERYL S. THOMASSeal Island, (via) Clarks HarbourShelburne CountyNova Scotia, Canada
I need a schematic for a Spartan A.C. Receiver, Model No. 1476, type1466 chassis, 115v-60Hz-200w,which was licensed under RCA pat-ents. This was from the Sparks-With-ington Co., Jackson, Mich., and to thehest of my knowledge the company nolonger exists.
BRAD HANQUISTPerryville Senior High SchoolElectronics Dept.Perryville, Mo. 63775
I'm in need of a schematic for aModel CC -25 intercom by the defunctVocaline Co. of America.
RICHARD A. KERR, JR.1714 Heritage Ave.Placentia, Calif. 92670
1 need a schematic for a Pioneer250 horizontal sweep quant-alyst madeby Doss Electronic Research, Inc., for-merly of 820 Baltimore, Kansas City,Mo. It was produced about 1959.
FRANK R. SNYDER SR.1434 ThomasSan Diego, Calif. 92109
. for more details circle 118 on Reader Service Card
28 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
make it the tube to watch.For economy, there is the color screen 85 family
of replacement tubes. But, economy doesn't meancheap construction. You can still give your cus-tomer features like Sylvania's Sharp -Spot electrongun and a rare-earth phosphor screen withoutbreaking his budget.
When you sell Sylvania, you're selling from thebroadest line in the industry. You'll have the tubeto match the set.
And a price to SYLVANmatch the wallet. GENERAL TELEPHONE & ELECTRONICS
With Sylvania's 3 lines of color tubes, you can meet it.Customers' wallets come in different sizes.Thick, thin and in-between.With Sylvania's 3 complete families of replace-
ment color picture tubes, you can be sure of havingthe right -priced tube for each one.
At the top end of the line, you've got the colorbright 85 ®XR the tube with our brightest phos-phors and X-ray inhibiting glass.
And in the middle, you have the color bright 85®RE . This is the tube that brought color TV out ofthe dark ages. Its bright rare-earth phosphors still
Every man has his price.
TTIMER
SUDDERTmTransistorized Test Unit substitutes the tuner indefective TV Receiver to prove whether originaltuner is good or bad.
Completely self-contained and battery operated.
Requires only two connections (antenna and i.f. cable)Comes complete with extension cables.
Substitutes the VHF tuner and tests the UHF tuner.
Provides signal to simplify testing of tuner, i.f. systemand AGC system.
Use on the bench, or in the home; in most cases withoutremoving tuner or chassis from cabinet.
Complete kit $22.95Factory wired $29.95Add $1.00 shipping and handling on prepaid orders. We will ship C.O.D.
CASTLE TV TUNER SERVICE5713 N. Western Ave., Chicago, III. 60645 Ph. 312-561-6354
. . . for more details circle 141 on Reader Service Card
Why pay an answeringservice when you can
own your own?Dictaphone has a machine tomake sure you never lose an-
t' other cent through a missedphone call or a garbled mes-sage. In fact. we have a wholeline of them.
They're called Ansafones. You can buy one outrightor possibly lease it for about what you're paying youranswering service now. And it worksforyou 24 hoursa day. 7 days a week.Call thistoll-free number: 800-243-6000. From Conn.call 1-800-243-6000. Or send the coupon below.I -
*DictaphoneBox L-5-24, 120 Old Post Road, Rye, New York 10580
Please send me full details of the Ansafone line.
Name
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ILAnsatone and Dictaphone are registered trademarks of Dictaphone Corp.
. . . for more details circle 115 on Reader Service Card
30 ! ELECTRONIC TECHNICIAN/DEALER, MAY 1972
I
-a
NEWS OF THE INDUSTRY
Second T DayScheduled for June 15th
Approximately 850 technicians took the National Elec-tronic Associations' certification test on March 15, 1972.Each commercial trade publication held a T -Day sessionand their help was appreciated by the entire industry. Moststate and local trade associations also held T -Day sessionswith many schools and universities cooperating.
Because of the many inquiries in response to recentpublicity of the CET program, another test day, T -DayNo. 2, has been designated for June 15th. To find outwhere you might take the test in your area, write to ISCET,1309 W. Market St., Indianapolis, Ind. 46222, or phone317-632-2469 for information.
This month we are providing the third in a series ofquestions-these representing the types of questions in-cluded in Part III of the CET examinations.
Section IIIAC Circuits
I. At resonance, the impedance of a parallel -tuned tankcircuit is very low. True/False
2. A series -resonant circuit can be used as a trap. True/False
3. Inductors have a self -resonant frequency lower thanwhen normally used in circuit. True/False
4. An emitter bypass capacitor increases the low -frequen-cy gain of an amplifier. True/False
5. A phase -shift network can be made from capacitors andresistors. True/ False
Explanations1. False The impedance at resonance is very high in a
parallel -tuned tank circuit.2. True Quite frequently a series -resonant circuit is used
as a trap since the impedance is very low at resonance.3. False Self -resonance with the distributed inductor
capacitance would be higher. Any circuit capacitancewould add to the distributed capacitance, and since f
1
V LC-=-_-_-,
when the capacitance (C) goes up, the resonant
frequency (f) goes down.4. You could argue for true or false on this one depending
on how you define low frequency. It is true if the lowfrequency that you are thinking of makes the reactanceof the capacitor (V) low; while if the low frequencythat you are thinking of is actually higher, the resultingreactance of the capacitor (Xe) may be rather high.(This bad question was left in to generate thought anddiscussion. We always strive to eliminate ambiguousquestions in the CET examination.)
5. True Since current and voltage are 90° out of phasein an RC circuit, several sections can be built for a par-ticular desired phase shift.
NATESA Executive CouncilFinalizes Convention Plans
The NATESA Executive Council, meeting in Chicagoon January 28th, finalized plans for the joint conventionon August 10th through the 13th in New Orleans at theJung Hotel, in cooperation with the NEA, ETA TSA ofLouisiana and ISCET. A contract was drawn which pro-vides for the distribution of responsibilities and preroga-tives. Under this plan, the various associations will hold
continued on page 32
There's anAmTerex replacement tube
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... for more details circle 102 on Reader Service Card
MAY 1912, ELECTRONIC TECHNICIAN/DEALER j 31
NEWS...continued from page 30
separate official sessions and will join together for meals,seminars and social functions. Nolan Boone will act ascoordinator for NATESA, Roger Drost will be "on -sitemanager," and Vincent Lutz will produce a joint YearBook.
The NATESA Executive Council activated plans for anew NATESA award to be called, "The CooperatorAward." Its purpose is to recognize those companies thathave been especially cooperative. There have been 13 com-panies nominated, subject to delegate approval. Many pre-vious F.O.S. winners, as well as several new companies,have already been nominated. This plaque is not to be con-fused with the NATESA "Friends of Service ManagementAward," which has been held in abeyance the past twoyears because it began to lose value due to proliferation.
An F.O.S. Committee, with George Weiss, ChicagoPresident, as chairman, was directed to study F.O.S. rulesso that the F.O.S. can be reactivated, but with only a singlewinner possible each year. This will be a super award. Win-ners of Cooperator Awards will automatically be con-sidered for the F.O.S. AWARD.
NATESA will host the next National Service Conferenceand Electronic Industry Council session in conjunctionwith its New Orleans Convention, upon approval of itsHouse of Delegates.
TESA of ArkansasHolds 9th Convention
The Ninth Annual Convention of TESA of Arkansas washeld on Sunday, March 26, 1972, at Paul's LamplighterRestaurant in Little Rock, about 80 attending.
During the meeting 1972-73 officers were elected. Theseincluded: Lawrence Barger, president; Joe Hall, executivevice-president; Noah Gabbard, area vice-president; WalterLong, area vice-president; Bill Childs, area vice-president;Mary Kelly, secretary; Jolly Wilson, treasurer; LowellJones, sergeant of arms; Harold Pruett, Roger Penny, DougRaley, Paul Boeckman, Maudie Burnett, directors; and Le-Roy Ragsdale, NATESA delegate.
An Outstanding Award was presented to Mrs. Jolly Wil-son by 1971 Convention Chairman Nolan Boone for herwork on the 1971 NATESA Convention.
Licensing Bills Considered inNew Jersey and Pennsylvania
We have learned from TSA News of Delaware Valleythat the Consumers Protection Bureau in Harrisburg willtry to force upon radio and TV servicing dealers in Penn-sylvania a licensing bill that is detrimental to the interestof our industry with no consideration for the many servic-ing problems confronted by the servicing dealer in hisdaily work. The publication indicates that this bill willonly force the service dealer to increase his charges to theconsuming public without any guarantees that the con-sumer will receive quality service by competent technicians.
In the same issue it was indicated that on January 25,1972 representatives of TSA met with New Jersey state offi-cials in Newark to discuss their proposed licensing bill.TSA's interest in this matter is to protect the interest of theTV servicing dealers. The state officials agreed that manyof the suggestions made to them by TSA representativesshould be incorporated into the licensing bill, and addition-al meetings will be held before completion of the bill.
RAYTHEON
1971
Another vintage yearfor the both of us.
1971 was a very good year. And 1972 already tastes evenbetter. The truth is every year's a vintage year for you,the independent serviceman, and Raytheon, the largest
independent tube supplier in the business. Last year,while a lot of other suppliers were running behind,
even dropping out of the race, the two of us had anothergreat year. We've come a long way together.
And like a good wine, we keep getting better.That's because Raytheon works so well with you.
And never works without you. That's the kind of thingthat makes for a very good year for both of us. Year after year.
. . for mare details circle 134 on Reader Service Card
32 ELECTRONIC TECHNICIAN/DEALER, MAY 1972
RCAs TV Sweep Chanalystchecks every VHF channel.And this complete system has other featuresyou need to restore new -set performance.
RCATV SWEEP CHANALYST
2
VFIF
v,,W,CSS
Concerned about CATV, CCTV,MATV? WR-514A checks allVHF channels for tuner malfunc-tion
Precision attenuator permits peakfringe area reception adjustment
Versatile snap -on probe allowsfast, accurate alignment tech-nique
One-year warranty on parts andlabor ... local replacement partsavailability
WR-514A
Unit combines the functions of asweep/marker generator, marker ad-der. RF, IF, video and special Chrom-Align sweep signals permit checking ofVHF tuners and alignment of IF, videoand color bandpass amplifiers. That'swhy we call the RCA WR-514A a com-plete system.
Yours for only $380* including RFoutput cable, three direct cables, con-nector adapter, VF/IF 75 -ohm inputhead, and two direct terminationunits. Ask your distributor if he offerseasy payment terms.
Special bonus offer -3 accessories worth $42.25*free with purchase of an RCA WR-514A
WG -433A
$11.25*
WG -434A WG -435A
4.i
$15.00 $16.00V16.00*
MIXER -INPUT ADAPTER VIDEO/CHROMA LINK/IF DETECTORBANDPASS DETECTOR
Together with the bonus accessoriesoffered below, you will have just whatyou need for TV alignment proce-dures.
To get the special bonus offer, sim-ply mail the WR-514A warranty cardto RCA Test Equipment Headquarters,Harrison, N.J. 07029. Offer subject towithdrawal without notice. See yourRCA Distributor for a demonstration.of the RCA TV Sweep Chanalyst. Ap-plication Notes and other technicaldata are also available - on request.`Optional Distributor Resale Price
RCAElectronicComponents
. . for more details circle 143 on Reader Service CardMAY 1972, ELECTRONIC TECHNICIAN/DEALER 33
NEW AND NOTEWORTHYFor additional information on products described in this section, circlethe numbers on Reader Service Card. Requests will be handled promptly.
AMPLIFIERS 700Power output rangesfrom 1/2w to 5w
Available for the first time is a series of packaged miniatureaudio amplifiers ranging from 1/2w to 5w in power output.The power amplifiers are ceramic -based hybrid circuits. The1/2w amplifier is 11/2 -in. by 1% -in. by 1/4 -in. thick. The 1wamplifier is only 11/4 -in. by 21 -in. by 1/4 -in. thick, whilethe 3w and 5w units are 17/8 -in. by 21/8 -in. with thicknessesof 1/2 -in. and 3/8 -in., respectively. Total harmonic distortionof all amplifiers is less than 5% rms at rated output power.Frequency response is essentially flat from 60Hz to 15kHz inthe case of the 5w unit, with a higher frequency cutoff inthe case of the lower wattage designs. The thick -film Series207C amplifiers are complete except for an output couplingcapacitor. Reportedly no special heat -sinking is requiredother than mounting on a standard printed wiring board.Sprague Electric.Co.
HOME BURGLAR ALARM KIT 702
Complete with full setof component parts
Each MW -880 burglar alarm kit includescomplete application, installation and testinstructions together with a full set of alarmparts. The instructions discuss how thissystem may best be used to provide neededprotection. Carefully written installationand test procedures describe how to achievea reliable and concealed system, how to testthe system before and after installation,and how to operate and maintain the systemin good working condition. The controlcircuit and battery are housed in a crinkle -finish box, 12 -in. by 71/2 -in. by 31/2 -in.Any cutting of the closed circuit wire orentry of the protected openings will soundthe alarm until turned OFF by the owner.Each kit includes an all solid-state alarmcontrol, a loud siren, magnetic contactsfor protecting six doors and windows, ashunt lock to permit the owner to enter thepremises, plenty of wire, a battery, andinstructions. Mountain West Alarm.
WIRELESS MICROPHONE 701Permits communication overFM type equipment
Designated as Model DM -55, the Wireless FM CondenserMicrophone permits communication over FM type receivers,tuners, portables or auto radios. Powered by a self-contained9v battery, the unit contains a transistorized FM transmitterand sensitive built-in microphone. It is lightweight,measures 43/4 -in. long by 1 -in. sq, has a positive actionON/OFF switch and is styled in a black case with silver trim.The DM -55 has a tunable frequency range of 88 to 108MHz andis FCC type approved. Tuning tool, operating instructions andapplicable FCC rules and regulations are supplied. Suggesteduser net price is $21.95. E-V/Game, Inc., division ofElectro-Voice.
FOR MORENEW PRODUCTS
SEE PAGE 70
For more information on Blonder -Tongue circle 104 on Reader Service Card.
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low
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for
min
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nois
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wea
k ch
anne
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the
pres
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tron
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ea.
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ea.
ch.
LB/F
M-2
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to 4
5dB
118=
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to 4
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to 0
dB
VH
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14
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--
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24C
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B-5
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P. X =
CU
VB
-35
4763
For
sm
all
to m
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ize
syst
ems
too
larg
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rou
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A a
mpl
ifier
s, a
nd n
ot la
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UV
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itter
feed
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for
low
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and
good
ove
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cap
abili
ties.
Thr
ee g
ain
cont
rols
(U
HF
, hig
h ba
nd V
HF
, and
low
ban
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HF
.)
$151
1.00
LB/F
M=
52dB
mV
(0.4
v)ea
. ch.
HB
=52
dBm
Vea
. ch.
UH
F=
48dB
mV
(0.2
5v)
ea. c
h.
LB/F
M=
17dB
to 3
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HO
= 1
5dB
to 3
3d6
UH
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to 3
9dB
INP
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14.3
dB R
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12.3
dB R
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6dB
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648
12
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r sm
all (
416
outle
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ms.
Tni
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men
ded
for
use
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me
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how
room
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frin
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let
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trem
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good
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ain.
Fal
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ntr
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sfo
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$ 52
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LB/F
M =
53.
5dB
mV
(0.4
7v)
ea. c
h.N
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52.
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fixed
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fixed
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mV
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UH
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s. W
ide
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r m
inim
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ise
or.
wea
l* c
hann
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f Ato
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$320
.00
LB/F
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V(1
.0v)
ea.
ch.
HB
---6
0dB
mV
(1.0
v) e
a. c
h.LB
/FM
25dB
to 4
5dB
NB
--
30dB
to 5
2dB
INP
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=_-
15d
B R
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RL
HR
OU
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7dB
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0.4d
bH
B0.
6dB
LB/F
M-±
0.3d
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B =
=0.
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17
CY
B-4
5412
68
For
larg
e V
HF
sys
tem
s, h
andl
es tw
ice
as m
any
sets
as
CV
B.3
0A. S
epar
ate
high
and
low
ban
d am
plifi
ers
with
indi
vidu
alno
isef
igur
e.co
mpe
nsat
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inco
ntro
ls(1
8no
isei
nra
nge)
. Wid
e dy
nam
ic r
ange
for
ofon
wea
k ch
anne
lsin
the
pres
ence
ofst
rong
sign
als.
Acc
epts
inpu
tfr
omei
ther
aV
HF
Ch.
2.13
broa
dban
d an
tenn
a, o
r tw
o se
para
te V
IIF a
nten
nas
Ch.
2.6
and
Ch.
7 1
2 (s
witc
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leot
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)
$206
.00
LB/F
M:v
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9dB
mV
(0.9
v) e
a. c
h.H
B=
54dB
mV
(0.5
v) e
a. c
h.LB
/FM
25dB
to 4
5dB
HB
= 2
3dB
to 4
5dB
INP
UT
=15
dB R
LO
UT
PU
T =
16dB
RI.
LB/ F
M =
9dB
HB
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- 7d
B
LB/F
M-4
dBm
V(6
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B-6
dBm
V(5
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/ FM
--
0.4d
BH
B -
-- 0
.6dB
LB/F
M-±
0.3d
BN
B=
±0.
3dB
14
CV
19.3
0A47
33D
esig
ned
for
med
ium
siz
e V
HF
sys
tem
s. S
epar
ate
high
and
low
ban
d ga
in s
ontr
ols
(18
dB r
ange
). E
xtra
wid
edy
nam
ic r
ange
. Ver
ylo
w n
oise
eve
nat
red
uced
gai
nse
tting
s. H
igh
outp
ut c
apab
ility
Rat
ed -
Bes
t Buy
" he
Pro
fess
iona
l MA
TV
inst
alle
rs.
$ 96
.10
LB/F
M52
dBm
V(0
.4v)
ea.
ch.
HO
52dB
mV
ea. c
h.LB
/FM
17dB
to 3
5dB
NB
- 1
5dB
to 3
3dB
INP
UT
=14
dB R
LO
UT
PU
T-1
3dB
RL
LB/ F
M -
- 6.
3dB
HB
7.2d
BLB
/FM
-7.5
dBm
V(4
40uv
)H
O-6
.5dB
mV
(480
uv)
LB /
FM
:n 0
.2dB
HO
0.2d
BLB
= ±
0.5d
BH
D±
0.6d
B7
4556
Per
fect
for
smal
l (4-
16 o
utle
t) V
HF
onl
y sy
stem
s.In
-0.
1 an
d ou
tput
con
nect
ers
type
f m
atin
g iti
r-59
1 S
inx
plie
d). P
rovi
des
pow
er fo
r pr
eam
plifi
er; v
irtua
lly o
ver.
load
pro
of!
$ 38
.50
LB/F
M53
.5dB
mV
(0.4
7v)
ca. c
h.H
B52
.OdB
mV
(0.4
0v)
ea. c
h.LB
/FM
/MB
/118
-(f
ixed
)IN
PU
T13
dB R
LO
UT
PU
T=
8dB
RL
LB/ F
M =
7.0
dBH
B 7
:-. 7
.5dB
LB/F
M--
8.5d
Biti
V(4
80ux
,H
B-6
.0dB
mV
(500
uv)
111/
FM
r 0.
5dIS
HB
-
--,:0
.8dB
5B
A -
11,-
75P
Top
qual
ityU
HF
am
plifi
eres
peci
ally
suite
das
anad
d-on
. For
use
in m
ediu
m a
nd la
rge
MA
TV
sys
tem
s as
com
pani
on to
CO
8.45
A e
rimin
atIn
g rb
d ne
edfo
r he
ad -
Rod
UH
F a
nd V
HF
con
rert
ort
Wid
e dy
nam
ic r
ange
for
min
imiz
ing
nois
e on
wea
k ch
anne
ls in
the
pres
ence
of
Str
ong
sign
als.
Fiv
ese
para
te s
tage
sof
ampl
ifica
tion
perm
it hi
ghou
tput
with
low
noi
se.
Gai
n co
ntro
lac
-ce
ssib
le o
n fr
ont p
anel
. Fea
ture
s U
HF
/VH
F m
ultip
lexe
rto
per
mit
use
with
VH
F a
mpl
ifier
s w
ithou
t nee
d fo
rex
tern
al m
ixin
g eq
uipm
ent.
9111
0.90
54dB
mV
(0.5
v) e
a. c
h.17
dB to
47d
BIN
PU
T=
14.0
d11
RL
OU
TP
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=11
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ST
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OV
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LEX
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SC
RIP
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NA
MP
LIF
IER
Am
plifi
er $
244.
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he p
erfe
ct h
eade
nd fo
r m
ediu
m to
larg
e M
AT
V s
yste
ms.
Eas
ilyO
utpu
t Cap
abili
tyLI
I/FM
-=59
dBm
V 1
0 9v
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elec
tivity
Filt
er$
27.9
045
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lanc
es a
ltern
ate
chan
nel
sign
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dam
plifi
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11-
54dB
mV
105
v1T
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hann
els
7-13
VA
RI-
FLE
X^t
en $
1.1
711
Con
vert
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70
4590
and
FM
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fro,
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urn.
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olf o
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iogl
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llirld
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yste
m c
onsi
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of:
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put s
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broa
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Sta
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from
Lia2
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5dB
to 4
5 d8
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13 to
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win
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RC
over
$ 24
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4579
band
ant
enna
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ploy
ed):
up to
8 ad
just
able
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vel,
sing
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cnan
nel i
nput
filte
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and
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F a
mpl
ifier
with
reg
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atch
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t= 1
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BR
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mrp
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unw
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put-
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Ret
urn
Loss
HE
AD
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Din
g pr
ovis
ions
for
four
. 4 -
way
sig
nal s
plitt
ers.
Pro
visi
ons
exis
tN
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Fig
ure
LB/F
M=
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BA
ttenu
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ange
SY
ST
EM
tor
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hann
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ages
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mit
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Min
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r T
AS
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=--
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TV
Cha
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3
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ters
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k fr
om s
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gnal
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xcel
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NA
type
leve
lco
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duce
sig
nals
whi
chm
ay b
e 20
times
stro
nger
than
wea
k on
es.
Hig
h ou
tput
cap
abili
tyis
desi
gned
for
driv
ing
PP
to15
0 ou
tlets
and
exce
llent
am
plifi
er h
ack
-m
atch
redu
ces
refle
ctio
nsfr
omth
e di
strib
utio
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by
Noi
se F
igur
e In
crea
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r dB
Cai
n R
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Ban
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ass
Fla
tnes
s
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-- 0
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340
LB0
3dB
FM
B
80'.
Line
volta
geva
riatio
nsbe
twee
n10
0-12
9V
AC
are
smoo
thed
by
are
gula
ted
DC
pow
er s
uppl
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rue
labo
r-sa
ving
plug
-on
des
ign
min
imiz
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oor
relia
bilit
y of
con
vent
iona
l, in
ter.
conn
ectin
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bles
.
Pow
er S
uppl
yR
egul
ated
, com
pens
ates
for
line
fluct
uatio
ns fr
om 1
00va
c to
129
vac
For
sys
tem
s us
ing
adja
cent
cha
nnel
s,co
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Eng
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Dep
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SP
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IFIC
AT
ION
S
FIL
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RC
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VE
RT
ER
70 r
ill d
own
9MH
z fr
om c
hann
elce
nter
20 d
B d
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CM
Ilz fr
om b
and
edge
tide
xt.
(inpu
t(4d
B (
min
. los
s) to
29d
8
:6 M
lle1.
0dB
flat
ness
)88
-109
MH
Z:
94 1
08 M
Hz
All
UH
F to
VH
F C
onve
rsio
ns e
xcep
t :C
hann
els:
22-
25 to
7
MT
h to
28-3
1 to
9
31 3
4 to
10
34 3
7 to
11
4/.4
8 T
O 1
240
.43
to 1
3U
M I
At1
R11
1141
10n
Adi
liStA
BIP
MO
M1(
18 to
-12
d11
Ret
urn
Loss
Inpu
t12
dB R
L
Out
put
8db
RL
Sel
ectiv
ity10
40 d
own
6 M
Hz
from
ban
d ed
geP
ower
Req
uire
men
t.-2
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c (s
uppl
ied
Cra
m a
mpl
ifier
)
SE
PA
RA
TO
R
impe
danc
e:7
5 oh
ms
Ret
urn
loss
111
11F
1 R
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outl
111S
eRie
ll LO
SS
Isol
atio
n be
twee
n ou
tput
s: 2
0dB
min
.
'VH
F L
B54
-88
MH
z, V
HF
FIB
174-
216
MH
z, F
M88
-108
MH
z, U
HF
470-
806
MH
z(L
ow B
and)
(Hig
h B
and)
**3
Cha
nnel
s in
LB
4 C
hann
els
inF
IB
3 C
hann
els
in U
HF
Pre
sent
sim
ulta
neou
sly
with
no p
erce
ptib
le d
isto
rtio
n.
*"
CV
B-45A
CV
B30A
CU
VB
-3.5
AM
PLIF
IER
S F
OR
TH
EP
RO
FE
SS
ION
AL M
AT
V.
CU
MB
LON
DE
R -
BR
OA
DB
AN
D D
IST
Rft
CV
B60
DA
-1U/V
-75
VANI4LiX MODULAR BROADBAND HADEN° SYSTEM
FIE
R S
ELE
CT
OR
LiUllit
CU
B -5P
7-7-71..B
A -1V
-75P
CU
VB
-54P
RA
TIN
G T
HE
OU
TP
UT
CA
PA
BILIT
IES
OF
AN
AM
PLIF
IER
AC
CO
RD
ING
TO
TH
EN
UM
BE
R O
F T
V C
HA
NN
ELS
IN A
SY
ST
EM
The output capabilities specified on the A
mplifier S
elector Guide
chart arefor -46dB
cross modulation products
(invisible)w
ith3 channels in the V
HF
low band (LB
), 4 channels in the VH
F high
band (HB
),and 3 U
HF
channels*all present simultaneously. T
his
rating is higher however,
if fewer channels are used in the system
oris
lower
if more channels are
used. The chart below
shows
how to rate the output capability of each am
plifier according tothe exact num
ber of channels in a system.
CU
VII-35,C
1/0-30A,D
A-1U
/V-75,011-1V
-75,CU
B-50
CU
VB
-54P, V
AR
I-FLE
X,C
VB
-60,CV
B-45A
No. of C
hannels
AM
PLIF
IED
FO
R C
OR
RE
CT
OU
TP
UT
CA
PA
BILIT
Y R
AT
ING
...
No. of C
hannels
AM
PLIF
IED
FO
R C
OR
RE
CT
OU
TP
UT
CA
PA
BILIT
Y R
AT
ING
...
VH
F
LB&
HB
UH
F*
VH
F
LB &
HB
UH
F*
VH
F
UH
F*
VH
F
UH
F*
LBH
BLB
HB
22
add 7.8 dBadd 3.0 dB
22
2aT
dd 3.0 dBadd 4.8 dB
add 3.0 dB
33
add 4.8 dB0dB
33
30 dB
add 1.8 dB0dB
44
add 3.0 dBsubtract 1.8 dB
44
4subtract 1.8 dB
0 dBsubtract 1.8 dB
55
add 1.8 dBsubtract 3.0 dB
55
5subtract 3.0 dB
subtract 1.2 dBsubtract 3.0 dB
66
add 0.8 dBsubtract 4.0 dB
66
subtract 4.0 dB
77
0 dBsubtract 4.8 dB
77
subtract 3.0 dBsubtract 4.8 dB
88
subtract 0.6 dBsubtract 5.4 dB
8subtract 5.4 dB
99
subtract 1.2 dBsubtract 6.0 dB
9subtract 6.0 dB
1010
subtract 1.7 dBsubtract 6.5 dB
10subtract 6.5 dB
1111
subtract 2.2 dBsubtract 7.0 dB
11subtract 7.0 dB
1212
subtract 2.6 dBsubtract 7.4 dB
12subtract 7.4 dB
*where applicable
HO
W T
O U
SE
TH
E C
HA
RT
Exam
ple 1.T
he CU
VB
-35's rated output capability with 3 channels in the high
band, 4 in the low band, and 3 U
HF
channels isgiven
in the Am
-plifier S
elector Guide as:LB
/FM
= 52 dB
mV
each channelF
IB52 dB
mV
cash channelU
HF
= 48 dB
mV
each channelA
particular system uses one low
band channel, four high bandchannels, and tw
o UH
F channels. T
his amounts to 5 V
HF
channelsand 2 U
HF
channels. Looking at the chart,it can be seen that the
CU
VB
-35's VH
F output capability
isincreased
by1.8 dB
andits
UH
F capability is increased by 3 dB
. The increased output capabil-
ity rating is computed as follow
s.LB
/FM
= 52 dB
mV
+ 1.8 dB
= 53.8 dB
mV
each channelH
B =
52 dBm
V +
1.8 dB =
53.8 dBm
V each channel
UH
F =
48 dBm
V +
3.0 dB =
51.0 dBm
V each channel
Exam
ple 2.T
he CV
B-60's rated output capability w
ith 3 channelsin
the lowband and 4 channels in the high band is given as:
LB/F
M =
60 dBm
V each channel
HO
-60 dB
mV
each channel
Inthis exam
ple asystem
uses 4 low band channels and 3 high
band channels. Nu U
HF
channels are used.It
can be seen fromthe chart that the C
VB
-60's low band output capability rating is re-
duced by 1.8 dB and its high band rating
is increased by 1.8 dB.
The new
output ratings are determined as follow
s:LB
/FM
- 60 dBm
V - 1.8 dB
58.2 dBm
V each channel
HB
- 60 dBm
V +
1.8 dB--
61,8 dRm
V each channel
MA
TC
HIN
G A
N A
MP
LIFIE
R T
O T
HE
RE
QU
IRE
ME
NT
S O
FA
DIS
TR
IBU
TIO
N S
YS
TE
MT
he prime consideration
inany T
V/F
M distribution system
isto
supply enough signal to each TV
cot to produce an accept?ble pieture. O
bviously,if sufficient signal
is supplied to the TV
set with
the most signal -loss betw
eenit and the am
plifier,all
the otherT
V sett can be supplied w
ith sufficient signal.
Total .system
-lossis
theam
ountof
lossbetw
eenthe
system's
amplifier and the "w
orst case" signal tapoff. That
is.the tapoff
with the m
ost loss between it and am
plifier. Splitting losses, cable
losses, and the thru-line losses of other tapoffs on the same cable
runall
contributeto
the total -system -loss.
After com
putingthe
total -system -loss,
itis
possible to determine the required output
rating of the amplifier needed to drive the system
.
It is standard practicein T
V/F
M system
design to supply at leastO
dBm
V (1,000uv) to each T
V tapoff in the system
. Thus, if the total
system loss
is50dB
, we m
ust have an amplifier capable
of de-livering at least 50dB
mV
on each channel in the system (50dB
mV
- 50db = O
dBm
V). T
his is essentially how one determ
ines what
amplifier
isneeded for a
particular system - by m
atching thetotal system
lossto
theam
plifier's outputcapability.
(See the
chart above tofind the exact output capability
of each Blonder -
Tongue distribution am
plifier relativeto the num
berof channels
in a system).
There
is an exception to the rule of matching the system
's totalloss to the am
plifier's output capability.In som
e areas, consider-ably m
ore than OdB
mV
of signal is required on a channel to over-com
e a direct pickup problem. In these instances, the am
ount of.signal (in dB
mV
) required to overcome local pickup is added to the
total -system -loss.
The sum
of the required signallevel and the total -system
-lossis
therequired output rating
of the distributionam
plifier.F
orex-
ample, in
a certain area 20dBm
V of signal
is needed on channel12 to overcom
e direct pickup. The total -system
-lossat
Ch.
12's
frequency is 35dB. T
o find the output capability of the amplifier,
simply qdr1
the minim
um signal needed on channel
17 (20C1B
ITIV
ito 35dB
:20dE
lmV
-4- 35dB55dA
mV
liredistribution am
plifier must have
atleast
a55dE
lmV
outputcapability in the high band to properly drive the system
.
CO
NT
AC
TY
OU
R LO
CA
LB
LON
DE
R -T
ON
GU
ED
IST
RIB
UT
OR
FO
RC
US
TO
MIZ
ED
AP
PLIC
AT
ION
AS
SIS
TA
NC
E
u,0
a
g
aoa
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ELECTRONIC TEC.HNICIAN/ DEALER MAY 1c.72
TEKLAB REPORT
Channel Master'sModel 6124A ModularColor -TV Setby Joseph Zauhar
The modular design of this TV chassis can take
the chore out of servicing and in most cases
eliminate pulling the chassis for the shop
It is generally agreed that withinthe next few years most TV sets willbe of modular design, and the color -TV set we are describing in this re-port is Channel Master's first modu-lar chassis aimed to speed and sim-plify servicing of color -TV sets-inmany cases eliminating the need forshop repair. This is the model 6124Acolor -TV set employing the hybridT5001 series chassis.
Channel Master's Model 6124A color -TV set employing the hybrid T5001 series chassis.
After unpacking the set, we werequite impressed with the cabinet de-sign, most of the customer controlsbeing hidden behind a panel doorwhich blends in with the Mediter-ranean cabinet; and when opened,the CHANNEL SELECTOR knobs, ON/OFF switch, VOLUME, AFT andAUTOMATIC TINT controls are withineasy reach. The slide throttle typeCOLOR and TINT controls are ex-posed on the front panel along theright side of the picture tube mask.The BRIGHTNESS, VERTICAL HOLDand CONTRAST controls are partiallyhidden and located on the lowerright of the picture tube mask. An-other important feature for the ser-vice technician are the concealedcasters, which simplify moving ofthe heavy console.
This newly designed "Integrid"chassis employs six plug-in mod-ules, each with its own function; andthe chassis is mounted on slidingrails for even easier access to thefew components beneath. If it be-comes necessary to remove the com-plete main chassis, this task is sim-plified by the employment of plug-inconnectors to the tuners, controlsand deflection yoke. These connec-tors cannot be interchanged becauseof the different socket shapes used.
The individual modules arc easy
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 139
to pull or replace and are wellsecured. Guide pins, which are alsoground points for the circuit board,are located on the main chassis.They guide the contact pins into themodule contacts. The modules aresecured with two spring locks oneach end of the module and twowing type fasteners in the center ofthe board.
This color -TV chassis includes a
With the door open, the CHANNEL SELECTORknobs, ON/OFF switch, VOLUME, AFT and
AUTOMATIC TINT controls are exposed. Also,
shown are the slide type COLOR and TINT
controls.
The panel is guided into the contact connec-tors by four ground pins mounted on the mainchassis. The boards are secured with springlocks and wing retainers.
Very few components are mounted under themain chassis frame.
number of automatic circuits: Tint,Chroma, Fine Tuning, DynamicCorrection, AGC, Degaussing andan Instant -On circuit. There are 19tubes, plus the picture tube, 6 tran-sistors, 9 silicon diodes, 12 seleniumdiodes and 2 crystal diodes em-ployed in this color -TV chassis. The25 -in. (diagonally measured) screenof the black matrix picture tube issaid to have a shadow mask con-
structed from die cast metal.Most of the circuits employed in
this chassis are already quite fa-miliar to most service technicians.However, during our review some ofthe features and circuits may be fol-lowed in this month's TekfaxSchematic No. 1416.
Power SupplyThe power supply includes a
Rear view of the TV set with the back cover removed,showing the various service controls.
Top view of the new hybrid modular color -TV chassis. The chassis employs six snap -in boards.
Shown is the etched -circuit side of the well road -mapped board with all components identified.
40 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
heavy power transformer which isbolted to the main chassis frame.The snap -in power supply module,PW1100, contains the bridge -typerectifier circuit, plus the thermistorand varistor for the automatic de-gaussing circuit. The two filamentfuse wires are located across the ter-minals on top of the main chassis,eliminating the need to remove thechassis to replace the fusible wire.
Board PW300 contains the picture (or video)IF and sound circuits.
Board PW700 contains the chroma circuitry.which employs three transistors and five66H8 tubes.
The PW500 board contains the deflectioncircuits.
This chassis is also protected by adual purpose reset -type circuitbreaker which is incorporated in thelow -voltage power supply, half ofthe breaker being connected inseries with the cathode circuit of thehorizontal output tube to protect thehorizontal output circuitry.
Picture IF and Sound CircuitsThe picture (or video) IF and
Shown at the left is the PW1400 automaticfine tuning board while at the right is thePW1100 snap -in pcwer supply board.
A solid-state voltage multiplier circuit is usedin the high -voltage rectifier unit.
PWI100
+35
DA 6A05A6J1I6
0 koo ourmo
III Fix 1.1 002
6C 6V305 60161116WU*, MT
mv>oond14 Qecws0 0305. 10 1 F
YR1F1i1 14 03071HW? vao0 OUTPUT
6316GRNDRrvt
702045
611101 NOIR06 0163/6.164
0103A.01
5119N.C5CG MCI.
70A440/02
001...045 o cox. 601.111A401.1A KILLER 0
2(704101. a Rt'-'7"001.4
CA°W, 070541E1GOMA41.1.41
070244SWF/
0007 05G1ART 0030076011110449A
055 RO0
W OSG &0 FR 4(10.611
56105(0
66E6 11, 147656 117306 67306 9526KR 67656 RNl R PotINAS v011 lINSON GRN
SCADJUST
RN 6765C 632665(00 7C91 9151 01.3 SCRN NE1GMT
55015010C1 56or0i
a6902
NOINI1.1N9FnNG
v901
vp2 E4506906A/EL509
DAMPER
ROM? Ou TRur
PW900
(50101111 ROL D
69150( u5
Top view of the chassis showing the tube layout and rear chassis adjustments.Courtesy of Channel Master.
sound board (PW300) includes athree -stage high -gain IF amplifierand at.Jio circuits. Two transistorsare employed on this board --onebeing used as the AGC amplifierand the other a video amplifierwhich drives the 12BY7 video outputtube. Also contained on the board arethe green, blue and red cathode cir-cuits which are connected to the pic-ture tube cathodes with push -on type
The horizontal output board (PW900) employsa fifth harmonic tuning system and eliminatesthe need for a high -voltage regulator tube.
connectors to simplify board re-moval. A three -position slide switchis employed which can be placed inthe RASTER, NORMAL or SERVICEposition with the lever protrudingthrough the back cover of the TVset. Also included are the BLUE andGREEN DRIVE, AGC and BRIGHTNESScontrols.
Automatic Fine Tuning(AFT) Circuit
The PW1400 automatic fine tun-ing board is contained in a separateshielded chassis and mounted in theright rear of the main TV chassis.The AFT adjust coil can be adjustedwith the back cover in place, al-though the adjustment is only madeif the manually fine-tuned picturechanges when the AFT switch isplaced in the ON position. Use astandard .076 -in. hex core wrenchand turn it until the picture qualityand color intensity are essentiallythe same as when the AFT switch isin the OFF position and the fine tun-ing control is properly set. Thencheck the AFT action on all localchannels to be sure the adjustmentsatisfies any peculiar reception con-dition
continued on page 77
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 41
Sliding Door
Swinging Door
Same PriceOnly Ford vans have sc many bet-ter ideas that make sans easierto drive, to service, to use.
Now you have a ch Dice c- con-ventionalswingingdoors or.at thesameprice, a newg iding side door for ca -god ing in cramped alleys and be-side loading docks. Three sepa-rate tracks, at top, bottom andcenter, give bridge -like supportfcr solid, smooth one-ian: ooera-tion, tight seal.Shorter outside, easie to park.Compared to other makes withsimilar loscspace, Econolineshave significantly less overalllength for better man3Lyerabilityin city-delive-y operations.
har-
Easy, out -front servicing. RoLtineservice points areright at land undercomer lent outs dehood: .water, oil.battery, wioer
motor voltage -ec-ulator, aid many
otters.Strong, Twin -I -Beam lndepencentFront Suspension-For-Ss exclu-sive design smootis the going forboth load and
forged steel\
1 -beamaxl-m prcrvide strength and ciLra-bil tv wide wheel s-arce meansstaokility in cross wirds.
Wider at top for built-ins. Bodysides are more vertical, wideraoart at tcp than otter eans. Bt,i t-ar units it better.
Sales leaderfor 11 straight years.
Biggest payload. E-300 ser es of-fers 4,285 -lb payload capacity-big;est of any van.
Engine clear forwac11. 11 Ford'sclear -deck de-sicn, engine isforward-all theway out ofcar:o area.Ove- 812 ft.clear floorbehnd driver'sseat...over10 ft.in theSuperVan.
(Li
FORDECONOLINE
VANSCAD
.. ter wore details circle 122 on Header Servitor Card
42 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
FROM ANTENNATO T.V. SET DELTA-BENCO
HAS ALLYOUR 82 CHANNEL EQUIPMENT
AT THE ANTENNAAMT Series - Matching Transformer for single
UHF channel, or 2-83.MBT Series - Pre Amplifiers for single
UHF channel, or 2-83.AC Series VHF-UHF couplers.SI Series Signal Injectors -single UHF channel
to all -band down lead.
AMT MBT
IL a TBA
82 CHANNEL DISTRIBUTION AMPLIFIERS
TBA/283/6-46db GainFour Outputs - 75 ohmMax. Input UHF + 27db
VHF + 20db
TBA/283/1212db GainSingle 75 ohm output.Max. Input UHF + 32db
VHF + 32db
TBA/283/2525db GainSeparate UHF -VHF
inputsMax. Input UHF + 28db
VHF + 26db
2873/283wwww, 6.RMIX
INPUT
DELT.%
2x75/283 4x75/283
7\ 17
a
16"=mmaLt
A complete range of 30 - 890 MHz Splitters; 75 ohm4, impedance for indoors or nut. Available with two, three6 or four outputs.
3x75/283IN
82 CHANNEL SPLITTERS
DELTA
10,1,2.3
el 04/04111 illi0,... TAUS .4.:
15
.-.-
TO-2/283
TO- SERIES
TO 2/283W
82 CHANNEL TAP-OFF's
Available for indoor or outdoor use with 1, 2, or4 taps. Isolation values of 20, 15, or 10db.
82 CHANNEL WALL PLATESFive models available for 75 or 300 ohms. Taps loss 10, 15, or 20db.
AT THE T.V. SET
MM -283UHF -VHF Matching Transformer75 ohm input2 x 300 ohm output
LS-U/VUHF -VHF Band Separator300 ohm input2 x 300 ohm output
DELTA-BENCO LTD.70 RONSON DRIVE REXDALE ONTARIO
(416) 247-7431 TELEX 06-965552
REPRESENTATIVES:EASTERN USAJERRY CONN & ASSOCIATES INC1070 S. COLD BROOK AVE.CHAMBERSBURG, PA 1720117171 263 8258
WESTERN USA'.
B. E. DUVAL CO.29619 S. WESTERN AVE.SAN PEDRO. CALIF. 9073212131 833 0951
. for more details circle 113 on Reader Service Card
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 143
Fig. 1-Typicalfield -strength meter.
irdalbrisiorramors*ovrvkcJams,E,1111111morvarreffrahrs.......ararramsvoramormrarikomaioNIENIalt
_JERROLC 747s5r:NAL LEVEL ME TECI
0
7
Professional AntennaInstallation Methods
by Bert Wolf
Despite the recent spate of electronic antennas,
miniature antennas and unusual designs, there is
really nothing radically new in the field of TV
antennas. Log-periodics, Yagis and variations of
these two basic designs still provide the
most efficient, effective TV and FM reception.
The current upsurge in color -TVsetsales has resulted in a correspond-ing increase in antenna sales. Sinceantenna business, properly handled,is exceptionally profitable, dealerswho don't emphasize this aspect oftheir business are neglecting a veryimportant revenue source.
There are two important aspectsof installing TV antennas: qualityand time. To be successful in theantenna business, your installationsmust be first class. They must bringin all channels sharp and clear. Theymust eliminate ghosts, snow, colorproblems and interference. Theymust be secure enough to providemany years of service. They must beneat and attractive.
Make antenna installations thatmeet these criteria and you'll en-hance your reputation for quality.But you still may not do very well interms of profit unless you can alsodo the job rapidly. Labor is a verybig factor in an antenna installation.You should always sell up to thefinest of materials, but labor is stilla large proportion of the cost. Sometwo -man crews can manage onlythree or four installations a day.Others manage 10 or more.
Of course, installation time variesby area and conditions. If you haveto spend a lot of time traveling,erect large towers, overcome diffi-cult reception problems or snakelead-in through walls, you won't beable to handle too many jobs in aday. But under normal circum-stances, a hard-working, efficienttwo -man crew should be able tohandle an average of seven or eightinstallations a day.
This article is aimed at helpingyou to increase speed while main-taining quality.
Choosing the AntennaYour customer generally depends
upon you to recommend the rightantenna to suit his needs. In a rela-tively short time, you should knowthe best types of antennas for mostreception conditions in your sellingarea.
However, it is always a good idea
1 he author is manager of theDistribution Sales Div., Educationaland Communications Div., JerroldElectronics Corp.
44 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
to sell up. If there are UHF channelsin the area, be sure to sell an 82channel antenna even if the custom-er says he never watches UHF. Hecan never tell when they will telecasta local sports event that he is veryeager to see. And an all -channelantenna is not much more expensivethan a VHF -only antenna.
If there is a choice, try to sell upthe most expensive antenna, ratherthan the cheapest the customer canget by with. Over the years of ser-vice, the difference in price is neg-ligible.
If there is a distant channel withgood programming, suggest a sys-tem that will bring it in. People areoften willing to spend a lot of moneyto get blacked -out sporting events.
Tools Needed forInstalling Antennas
Don't skimp on tools. A good as-sortment of quality tools more thanpay for themselves in the time theysave. Here's what you will need: A good field strength meter (seeFig. 1). Some antenna installers tryto get away without such a meter,but this is false economy. If youknow the area well, you won't needa meter for antenna selection. How-ever, a field strength meter is a must
GROUNDROD
1111I111111111111M11111111
-LIGHTN NG _
ARRESTOR
DRIP LOOP
Fig. 2-A chimney -mount installation.
for solving the reception problemsyou frequently encounter. It is a loteasier to eliminate interference ifyou know what frequency it is onand where it is coming from. Ameter can also tell you if the prob-lem is the antenna or the TV set, as
well as pinpointing the need for apreamplifier. Normal hand tools such as screw-drivers, diagonal cutters and pliers. A 1/4 -in. and a N -in. nut driver.These sizes fit almost all the nutsyou will encounter on U -bolts,mounts and rotators. A good set of ratchet wrenches.Ratchet wrenches are considerablyfaster than open-end wrenches. A leather tool belt. A heavy hammer (to driveground rods). A crimping tool (for coax con-nectors). A good compass and an air mapof the area. These tools will insureprecise antenna orientation. A level to make sure that themast is straight. A staple gun for running trans-mission line.
You will also need the followingitems: Silicon grease for waterproofingcoax connectors. Clear acrylic spray for protectingtwin -lead connections. Roofing tar for sealing up holesaround bolts, screws and standoffs. Caulking compound to usearound coaxial cable where it entersthe house. (You cannot use caulk-ing compound around twin -lead, sobe careful to drill entry holes up-ward and make sure they are underan overhang or a window sill.)
Locating the AntennaSome antenna articles advocate
"Walking the Roof" with a standarddipole attached to a field strengthmeter to find the right antenna loca-tion. This is not only dangerous, itis a waste of valuable time. Exceptfor the rare circumstances where youare fighting for every microvolt ofsignal, your antenna location shouldbe chosen with only one thought inmind: "Where can I make the fast-est, most secure installation?" Sig-nal considerations are secondary be-cause you can almost always getenough signal anywhere on the roof.
Antenna height is another matter.If signals are weak or blocked bytall trees, hills or buildings, a littleextra height can make a big differ-ence.
In a good signal area, use a 5 -ft.mast and don't worry about getting
the very strongest signals you can.In a fringe area, however, you willprobably have to go up 10 or 20ft. Since this makes for a difficultinstallation, don't make this choicelightly.
Connect your field strength meterto a small antenna and probe vari-ous heights for signal strengths. Ifthe difference between 10 ft. and 20ft. is only a few decibels, you aremuch better off to use a larger an-tenna or stacked antennas instead ofgoing up high. Whenever possible,try to keep your mast at 10 ft. orless.
If you are using separate UHFand VHF antennas, you have achoice of which to put on top.Generally speaking, you should putthe antenna that has to pull in theweakest signals on top. If UHFsignals arc weak, and you are usinga tall mast, it will probably pay youto probe various heights, since UHFsignals are not always strongest atthe greatest height.
Aiming the AntennaMany, perhaps most, antenna in-
stallers take antenna orientation toolightly. It is a very important aspectof the installation-especially if youare using high -gain, highly direc-tional antennas. An antenna posi-tioned just a few degrees off cancause poor color or color fadingfrom time to time.
Some installers just take a guessat the direction of the transmittingtower. They figure that they knowthe town pretty well, so they aim ata familiar landmark or by "feel."Needless to say, they often miss themark. Others use walkie talkies-one on the roof and one at the TVset. This procedure is both inexactand time consuming.
The best way to aim an antennais with a compass and an air map.You can buy air maps for under$1.00 at most local airports. Theyshow the locations of the TVtowers, plus all other tall structures,ridges and hills. The compass andair maps tell you precisely how toorientate the antenna.
If it is a rotor installation, thecompass enables you to line the an-tenna up to point north. Aside fromaccuracy, this method also has theadvantage of saving time. You aim
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 45
the antenna only once and thentighten it in place.
Mounting TechniquesOnce you have chosen the an-
tenna and determined the optimumheight for it, your next problem isto decide what type of mount to use.Aside from towers (which we won'tcover in this article), there are threebasic types of mounts: Chimney mounts. Base and tripod mounts. Wall mounts.
Generally speaking, chimneymounts are the fastest and easiestto use (Fig. 2 shows a typical chim-ney -mount installation).
Here are a few tips on chimneymounts: Before you decide on a chimneymount, make sure the chimney isstrong and in good shape. Manymodern chimneys are false-notreally made of brick. Attach an an-tenna to one of these and the chim-ney is liable to blow down with theantenna. And, of course, you maybe liable for the damage. Even witha brick chimney you have to becareful. If it looks shaky or thereare bricks missing, stay away fromit. Customers are prone to blameyou for the damage whether youcaused it or not. Don't mount the straps too closetogether. For masts 10 ft or higher,you should leave at least 21/2 ft be-tween the top and bottom straps.For 5 ft masts, at least 2 ft of sepa-ration is required. If you can't sepa-rate the top and bottom straps by atleast 2 ft, the chimney is too shortto use. If you go to 10 ft or more abovethe top of the chimney, use a guyring and guy wires, as shown in Fig.3. Even with guy wires, don't tryto go more than 19 ft above thechimney top, unless the antennais unusually small, ice loading is noproblem and high winds are veryrare. Make sure the straps are abso-lutely straight, with no kinks. Youcan do this easily by lining eachstrap up with a row of bricks. If thestrap is not straight, it will probablymove under stress. Pull each strap tight, then line itup straight, pull it tight again andclamp it loosely in place. Then, be-
fore the straps are completelytightened, fasten the mast (with theantenna) in place.
Now comes an important stepthat many installers ignore. Useyour level to be sure the mast isvertical. You can't really do a goodjob by eye, especially on a slantroof. Even a small deviation fromvertical causes the weight of the an-tenna to apply torque to the mount.Besides, it looks unprofessional. Use the compass and air map toaim the antenna in the right direc-tion and then tighten everything inplace. Secure all bolts with yourratchet wrenches, making certainthat everything is very solid. Youshould not be able to turn the an-tenna on the mast or the mast on thechimney mount.
Base and Tripod MountsFig. 3 shows a typical base mount
installation. A base mount has onlyone job-to hold the mast firmly atthe bottom. Because base mountshold masts only at one point, how -
Fig. 3-Use a guy ring and guy wires forthose higher antenna installations.
ever, guy wires are a must. The ruleis, use a set of guy wires for every10 ft of mast.
A base mount can be used any-where on the roof, but you shouldtry to position it so that all of themounting screws bite into solidwood. You can usually find solidwood *near the peak of the roof,which is an ideal spot for a basemount.
If you can't hit solid wood in a
convenient mounting place, youhave two alternatives: Fasten the base mount to a two-by-four long enough to pass overtwo rafters. Then, bolt the two-by-four to the rafters. You can locatethe rafters easily by tapping andlistening for a dull sound. If indoubt, drive a small test nail. Besure to seal any holes made by testnails with roof tar. Use a 5 -in, or 6 -in. square of 1 -in. or 3/4 -in. plywood inside theattic. This is a two -man job. The in-staller drives lag bolts through themount and the roof; and the lagbolts pull the wood square up tightagainst the inside of the roof, mak-ing a very solid installation.
The first method is generallyeasier and faster, but you may haveto use the second method for someinstallations. Many experienced in-stallers carry precut lengths of two-by-four and squares of plywood intheir trucks to save time on the job.
When you have got the basemount firmly anchored, put the an-tenna and mount in place. It is mostefficient to preassemble the antenna,the mast, the guy ring and the guywires on the ground. By the timeyou put the mast into the mount,everything should be ready to go.
Here is an important point: Donot insert the mast so deeply into themount that it will make contact withthe roof. Make sure that all of theweight of the assembly is carried bythe base mount. Otherwise, the mastcan easily damage the roof.
With the antenna/mast assemblyattached to the base mount, yournext step is to move the mast to anupright position. If it is a short mast,you can simply pick up the antenna.Then, while one man holds it inplace, the other man can fasten theeye bolts and pull the guy wirestaut.
If it is a tall mast, you will haveto "walk" it up. First, install an eyebolt directly across from the an-tenna, as far away from it as youcan go and still hit solid wood. Pullone guy wire through this eye bolt.Then, while one man pushes themast up, the other takes up slackand helps by pulling on the guywire. Once the mast is approximate-ly vertical, pull the guy wire fairlytaut and secure it in place.
46 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
Use turnbuckles on the remainingtwo guy wires. (Some installers usefour guy wires, but three do the jobjust as well) Get the antenna as up-right as possible with the remainingtwo guy wires, and clamp them inplace. Then, use your level to checkon how vertical the mast is. Take upslack with the turnbuckles.
When you finish, the antennashould be pointing in the right di-rection, the mast should be verticalwith no bows, everything should besecure, and the guy wires should bestraight. Do not make the guy wirestight as a bowstring. A little slackwill permit the mast to sway a littlein the wind. Remember, mightyoaks are sometimes felled by highwinds, but saplings generally justbend and snap back.
Tripod mounts are especiallyhandy for short masts on roofswhere you can't use a chimneymount. If the mast is only 5 -ft high,you can use a tripod mount withoutguy wires. In fact, if the antenna issmall and the tripod is big, you canuse a tripod mount with a 19 -ft mastwithout guy wires. For taller masts,tripod mounts are not too practical.If you are going to use guy wiresanyhow, base mounts are less ex-pensive, much easier to install andjust as good as tripods.
Wall MountsFig. 4 shows a typical wall mount.
Wall mounts are very easy to use.You simply anchor them to the walland fasten the mast in place. Of
Fig. 4-Wall mounted antennas are easilyinstalled.
TAPE STO-82 MATCHING XFMR
STAPLES
DRIP LOOP
VHF UHF
0
3FSX-1314XFMRSPLITTER
COAXIAL CABLE
Fig. 5-Typical coax installation.
course, you must be certain that allmounting bolts bite into solid wood.If you can't hit wood, fasten eachwall mount to a piece of wood (atwo-by-four or 3/4 -in. plywood).Then fasten the wood to a stud orbeam. Or, use a piece of plywoodinside the attic, as described for basemounts.
Here are a few tips on using wallmounts: Make sure the wall mount brack-et holds the mast far enough awayfrom the wall to clear any overhang. Separate the wall mounts by atleast 2 ft. The taller the mast, themore separation you should have. There is no practical way to useguy wires with a wall mount. There-fore you should restrict the mastheight to 10 ft, if at all possible. Ifyou have to go up as high as 15 ft,use a 20 -ft mast with three wallbrackets spaced 2 ft apart. In an in-
stallation such as this, there is a tre-mendous amount of torque on thewall brackets. If you don't hit beamswith all of your mounting bolts, thistorque may eventually split thefaceplate of the house.
Guy Wires
There are three important as-pects of installing guy wires. First,plan ahead. Do as much preassem-bly work on the ground as possible.
Second, use good quality guywires. Vinyl -covered, aluminum -strand guy wire is light, strong andexceptionally easy to handle. Becareful not to allow kinks to develop.
Third, anchor the guy wires se-curely, using eye bolts or guy hooks.Make sure the eye bolts bite deeplyinto solid wood. Otherwise, theeye bok will eventually pull away.Not only will the antenna fall, roofdamage will result.
If it is a multiple guy -wire instal-lation (that is, one set of guy wiresat 10 ft and another set at 20 ft),you can use one eye bolt for two guywires. However, if you can, you arebetter off to use a separate bolt foreach guy wire.
Once the antenna and mast arefirmly in place, use your roof tarliberally. Fill any test holes, and ap-ply the tar around all bolts andscrews that penetrate the roof.
Lead -In Wires
Transmission line is a very im-portant part of any antenna installa-tion. It is the transmission line thatactually delivers signals to the TVset. And many reception problemsare caused by poor quality transmis-sion line or badly installed transmis-sion line.
In selecting transmission line, youhave to choose between coax andtwinlead. Many top installers favorcoaxial cable because it is shieldedagainst interference pick-up and it isconsiderably easier to run. Twinlead,however, is often preferred in weakUHF signal areas, because goodquality twinlead, well installed,causes less signal attenuation thancoax at UHF frequencies.
No matter which type you select,use the best you can find. Cheaptwinlead often cracks or breakswithin a couple of years. Good
continued on page 76
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 47
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48 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
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GENERAL ELECTRIC
Working with Commercial -Audio Equipment
by Jack Hobbs
Part III --Learn the various distribution methods
employed in multi -speaker audio systems
Part II in this series appeared in the March 1972 issueof ELECTRONIC TECHNICIAN/DEALER. That articledealt with basic considerations involved in selectingamplifiers, speakers and microphones. The present arti-cle will concentrate on audio distribution principles-basic techniques used where electron -tube and solid-state amplifiers are employed.
General ConsiderationsElectron -tube amplifiers require the use of hefty, well -
designed primary/secondary type output transformers.This is necessary for matching high -impedance electron -tube plate circuits to low -impedance speaker voice coils,for isolating the high dc B+ voltage from speaker voicecoils and for a measure of stability. Where an unusuallylarge number of speakers are required at different powerlevels, we find it convenient to use a "constant -voltage"distribution system-however, this becomes somewhatexpensive. In many cases, traditional series, parallel andseries/parallel direct -to -speaker methods can be used toadvantage with transformerless solid-state amplifiers.The primary advantage of transformerless distributionis a reduction of installation costs by eliminating ampli-fier output and line -matching transformers. Additional-ly, with direct interstage-coupling employed in thesesolid-state circuits, the overall system operates at higherefficiency. You get more milliwatts-per-dollar to thespeakers.
Low -Impedance Speaker CouplingCommercial -type electron -tube and solid-state mon-
aural amplifiers are available having output transform-ers which usually provide 4f/, 811 and 1611 speaker tapsin addition to 25v and 70.7v constant -voltage taps. Low -impedance taps are normally used when the speakerlines are not too long, while high -impedance taps arenormally employed on longer speaker lines to reduceline losses. In this case, line/speaker matching trans-formers are needed; and if the speakers are far apart, itis necessary to use a transformer at each speaker orsmall group of speakers.
When using series or parallel speaker connections, wehave a somewhat limited choice in the number of speak-ers that can be employed on low -impedance taps. Butwith series -parallel connections, we can do very wellwith low -impedance taps on both output transformerand transformerless types. That is, if the speaker linesare not too long. There is one problem, of course, with
series connected speaker groups. if one voice coil opens,all the speakers go dead.
Four 411 speakers are shown in Fig. 1 connected inseries to the 1611 tap of an output transformer second-ary winding. Two 1611 speakers connected in parallel tothe 811 tap are shown in Fig. 2. And four 1611 speakersare shown in Fig. 3 connected in parallel to the 411 out-put transformer secondary tap. This is about as far as wecan go in these directions without complications. Though,of course, we can go to series/parallel connections andconnect eight 811 speakers (four groups of two in series)to the 4f/ tap as shown in Fig. 4. (Or eight 1611 speak-ers to the 81/ tap.) And, as you can readily see without aschematic, 16 411, 16 811 and 16 1611 speakers can beconnected to the 411, 811, and 16f/ taps, respectively,by placing four groups of four speakers in series/parallel.
It is assumed in these examples that you won't both-er with mixing speakers of different impedances in par-allel and series/parallel. It is not usually recommendedin these cases, since it is seldom possible to get a properimpedance match. For example, if you employ one 811and one 16f/ speaker in the parallel circuit shown in
1 1 1 3Fig. 2, have: = RTyou would
RT=
812+
1611 1612 . =
1611= 51/211. You may not have trouble with the
3any
two speakers connected to a 411 tap, but the 811 speakerwill be drawing more power than the 1611 speaker, andthis must be considered. If you wanted a two -speakerarrangement to work that way-okay. But remember, ifthe same two speakers are connected in series, the effectis reversed. The 1611 speaker will consume more powerthan the 811 speaker.
High -Impedance SpeakerCoupling
With the higher -impedance output transformer tapswe can use longer lines with less power loss to the speak-ers by employing line/speaker matching transformers atthe speakers. We can also employ a larger number ofspeakers. Additionally, speakers can be arranged ingroups that run at different power levels, without anyheadaches.
However, the high -impedance facility is normally of-fered only in electron -tube output -transformer typeamplifiers with power output ratings of 1 Ow or 20w-having 50011 and 25012 taps respectively. The 50w am-plifier offers a 10011 tap. Some higher powered amplifiers
50 ELECTRONIC TECHNICIAN/DEALER, MAY 1972
Ou put
Transformer
Fig. 1-Four 412 speakers are connected in se-ries to match the 1612 tap of an amplifier'soutput transformer secondary.
Output
16
Transformer
Fig. 3-Four 1612 speakers are connected in parallel to match the 4:2 tap of an amplifier's out-put transformer secondary.
Fig. 2-Two 16'.2 speakers are connected in Fig. 4-Eight 8:2 speakers are connected in four groups of two to match the 4:2 tap of an am -parallel to match the 812 tap of an amplifier's plifier's output transformer secondary.output transformer secondary.
offer a little flexibility here for matching 500/60011telephone lines, but the output levels required are gener-ally low.
Two 1611 speakers are shown in Fig. 5 connected inparallel to a 25011 line through a matching transformer.In Fig. 6, four series/parallel 811 speakers are shownconnected to a 50011 line through a matching trans-former. When one (or more than one speaker) is con-nected to a single matching transformer, it must be cap-able of handling the total power drawn by the speaker(or speakers). And when the speakers are separated bya considerable distance, one transformer is used for eachspeaker-as shown in Fig. 7.
In many installations we may need to run one ormore speakers at different power levels. An example ofa low -power, 812 speaker system will suffice to illustrate(Fig. 8 )-although any reasonable number may be used-depending on the amplifier power provided. In thiscase, the amplifier is rated at 20w and is located quitesome distance from the nearest speaker, and each speak-er is separated a considerable distance. Two 2.5w, onelOw and five 1w speakers are needed. The 1w speakersare spread out over a large area. The maximum high -im-pedance tap on the output transformer is 25011.
The first step is to find the ratio between the totalpower (20w) and the speakers in each of the three
20wgroups. The ratio for each group is:
2.5w= 8:1 for the
two 2.5w speakers; Z-wv = 2:1 for the one lOw speaker;20w1w
= 20:1 for the five 1w speakers. These ratios show
the relationship between the line impedance and the to-tal effective parallel transformer primary impedances sothat a perfect match and maximum power transfer willtake place between the line and individual speakers.
The second step is to determine the required match-ing transformer primary impedance for the three speak-er groups. For the 2.5w speakers: 25011 (line imped-ance) x 8 (ratio figure) = 200011 or 2K. For the lOwspeaker: 25012 x 2 = 50011. And for the five lw speak-ers: 25011 x 20 = 500011 or 5K. The total effectivematching transformer primary impedance in parallel, ac-cording to ohm's reciprocals formula, equals precisely
1 1 1 1 1that of the 25011 line. ( =
RT 2K 2K 50011 + 5K1 1 1 1 5 5
5K 5K 5K 5K 10,00012-+ 10,00012
MAY 1972, ELECTRONIC TECHNICIAN/DEALER j 51
Ou put Mat( long
70 7v
250 250
Trans ormer
Output
Transformer
Fig. 6-Four E22 speakers are connected in aseries/parallel circuit to a 50012 line through a
matching transformer.
Transformer
C -
Line/SpeakerMatching Transformer
2K 0CZY
Ot t )ut
500 500
Transformer
2 Sw
L
2K
16Fig. 5-Two 1612 speakers areconnected in parallel across a 2502.2 linethrough a matching transformer.
Matchin':
Transformer 48, 4
Fig. 7-When speakers are located some distance apart, a matchingtransformer may be required for each speaker.
2.5w
Fig. 8-An 82 speaker arrangement employing matching transformers on a 25012 line.
5KC) 5K CZ> Iw
lw
Fig. 9-A three speaker systemoperating from a 70.7v constant -voltageline. Cour esy of Belli PA.
iC ICIC
00.62 0.62 10.62
11.25 I I 2511.25
1 2.50 .2.50 8 12 5015.0 16 16 I 15.0 If,110 0 110 0 100
52 ELECTRONIC TECHNICIAN/DEALER, MAY 1972
20 2 2 2
10,000,11 + 10,000C/ + +10,000f1 110,0005+2 2 40
RT10,0001/
10,0005+ 10,0000
= =.10,00011 40
2501/ ) It is understood, of course, that the matchingtransformer secondary impedances selected shouldmatch the speaker voice -coil impedances. Line matchingtransformers, which are already attached to speakers bythe manufacturers, have the proper secondary imped-ance to match the speaker voice coil.
Constant -Voltage DistributionSome technicians have become confused about "con-
stant -voltage" audio distribution systems. One erroneousidea is that this system "eliminates" the need for imped-ance matching. It does not, of course, since impedancematching is "built-in" and is automatic-just as auto-matic as the voltage in the so-called "constant -imped-ance" system just described for the 8f/ speaker system(Fig. 8). Another erroneous idea concerns "constant -voltage" itself. There is seldom 25v or 70.7v (or 141.4vin some older systems) of audio signal on the distribu-tion line-except when a constant amplitude test signaldrives the amplifier to its maximum rms power output.It does mean, however, that the primaries of each line/speaker transformer have the same voltage available toprovide its individual speaker with the power that it re-quires-determined by: the transformer's primaryimpedance and a perfect impedance match betweenthe transformer's secondary and the speaker voice coil.It is nothing more than a point of reference, a viewpoint-a convenience in eliminating some impedance -match-ing problems. (It is assumed here that the amplifier isdesigned to have proper output regulation.)
If the line/speaker transformer primary taps aremarked in watts, all we do is select the tap that will pro-vide the speaker with the necessary power and connectthe transformer primary across the voltage distributionline.
If the line/speaker transformer primary is marked inE2
ohms, use the equation P = , or you can use a volt-
age, ohms, wattage monograph to convert to watts.Whether we use a 10w, 50w or 100w amplifier in the
constant -voltage distribution system, the line signal volt-ages are the same (25v or 70.7v). And the experts tellus (if we have translated them correctly), that the sys-tem works best when the amplifier is loaded close to itsmaximum power rating-but not overloaded.
A three -speaker system designed from the 70.7vviewpoint is shown in Fig. 9. A lOw amplifier is used.(Note that the 811 speaker, rated at 2.5w, is being sup-plied with only 1.25w. Hence, there is enough reservepower to double the wattage on the 81 speaker or addan additional 1.25w speaker and not overload the am-plifier. The power is doubled on the 811 speaker merelyby moving the line to the 2.5w transformer tap.) Thisarrangement consists of one 451 speaker, supplied with2.5w; one 8f1 speaker, supplied with 1.25w; and one16ft speaker supplied with 5w. Although in this systemwe are not too interested in transformer primary imped-
L 401
=_- C 401.22
R40320SW
OUTPUT CONNECTIONS
IMPEDANC7COMMON PIN
PIN TRAM. VOLT
2- 5 , 8I GNO.
2 D BEE 2I.9V3 o 811 21 . 9V
4 C 10.5.n. 25 V5 C 10.511 25 V6 A ISOLATED RETURN 70.7V7 8 S3.3 rt. 70. 7 V8 0 B -n. 21. 9 V
25 V5
70.7 v
J 103TAPE/BOOSTER
GREEN
T 102
RUE
RED
NOTE I
X --WHITE
BLACK
J 105
OOOOO
1 OUTPUTTERMINALS
70.7V
25 V
GNO
Fig. 10-Schematic of the autoforrrer output of a 100w UniversitySound solid-state amplifier.
.02
1611
en
25V5.211
25vETI.3v
IMPEDANCESLECTOR
Fig. 11-Output transformer section of a
120w Bogen solid-state amplNfier.
MAY 1972, ELECTRONIC TECHNICIAN/ DEALER 1 53
16
25
162;w
Fig. 12-Five 16'.2 speakers arranged to place a 4.61 load across theoutput of a solid-state transformerless amplifier.
4
Sw
T4
I 25w
Fig. 13-Five 4s/ speakers arranged to place a 1412 load across theoutput of a solid-state transformerless amplifier.
Fig. 14(A)-In this arrangement the 41.! speaker will draw twice asmuch power as the 8s! speaker. (13)-In this arrangement the 4s! speak-er will draw four times as much power as the 165! speaker.
4 Sw
16
4164*
4 Sw
9.6 16
606, 416
4.6.
164
164.
845.
Fig. 15-An arrangement of 14 speakers which will place a 9.6u loadacross the output of a 60w solid-state transformerless amplifier.
2ances, they are, according to equation Z = : 2K, 4K
and 1K, respectively.
Transformerless DistributionIn 1966 at a West Coast Convention of the Audio En-
gineering Society, a design engineer introduced a solid-state differential -type amplifier for stereo use which em-ployed six transistors in three cascaded complementary-symmetry emitter -follower stages in the output section.The driver/amplifier circuitry employed transistors to thefullest advantage by using direct interstage and directspeaker coupling. Research in these directions has beengoing on now for some years and commercial -grademonaural and stereophonic amplifiers are now beingmanufactured which employ the aforementioned circuit-ry and other modern techniques to produce more reli-able and higher -powered solid-state amplifiers, whichcan be used without output and line matching trans-formers in many modest -sized audio installations.
One line of solid-state commercial -type monaural au-dio amplifiers is available with or without output trans-formers. And the output transformer used in this line isan "autoformer" instead of a double -wound convention-al type. The output load -impedance and voltage tapsvary with different models. One 100w autoformer mod-el (Fig. 10) has 411, 811, 16fl and 25v and 70.7v con-nections. A similar model in this line does not use anautoformer-the output is taken from terminal 2 (PointD) on J105 as shown in the schematic. No octal socketis provided on the transformerless model. The outputimpedance on the 100w transformerless model of thistype is 851. It is 451 on the 60w, 85/ on the 35w and16f1 on the 20w amplifiers. It is said that the 8f/ out-put amplifiers can work satisfactorily into loads from 4f/to 10f1 and that the 1611 output can handle loads be-tween 14f/ and 2011. The output transformer section ofa more conventional type 100w solid-state amplifier isshown in Fig. 11.
It is obvious by now what our main problem will bewhen working with transformerless type solid-state am-plifiers. It will mean a little pencil work. And there isalways the square/square roots/reciprocals tables. Letus look briefly at the problem of employing speakers ofsimilar impedances running at different wattage levels.
Refer to the five -speaker arrangement shown in Fig.12. All of these speakers have a 16fl impedance. Threeare connected in parallel across the output while two areseries/parallel connected. The arrangement totals about4.6f/. If we use a 35w amplifier, we could run the threeparallel speakers at lOw each and the two in series/parallel at 2.5w each. (Five 4f1 speakers can also bearranged as shown in Fig. 13 to place a 1411 load acrossthe output of a 20w transformerless amplifier.)
These effects can also be approximated by usingspeakers of different impedances. For example, in thearrangement shown in Fig. 14A, the 411 speaker willdraw twice as much power as the 8ft speaker. By sub-stituting a 1651 speaker for the 811 speaker, the 411speaker will draw four times as much power as the otherspeaker (Fig. 14B). The reverse effect, as previouslymentioned, will take place when the two speakers arcconnected in series.
continued on page 80
54 ELECTRONIC TECHNICIAN/DEALER, MAY 1979
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EGGSteptaceinesat
)
13P :221;4",1022 "102 is.102/1021>102102102"1 02"102"102"102".102"102"102"102^.102P"
-----""ftwawimires01111.1
and hundreds more.The 102A is only one big part of
our very small line.Just 124 Sylvania ECG semicon-
ductor parts will replace over 41,000manufacturer's part numbers andJEDEC types.
Our new ECG semiconductor re-placement guide makes it easy foryou to find out exactly which one ofours is the one you need.
With our guide and our 124 re-placements, you can service prac-tically any solid-state entertainmen.product on the market.
No more lugging sets back to theshop because you couldn't carry allthe parts ycu needed.
With Sylvania's 124 semiconduc-tors you can handle almost all ofyour repair jobs right in your cus-tomer's home.
Stock up on Sylvania ECG semi-conductors now.
It's just another small thing fromGTE Sylvania that can take a bigload off your back.Sylvania Electronic Components,Waltham, Mass. 02154
effj SYLVANIA
$2.79can getyou$50.00Or, do you know all our secrets?
The other day, we got quite a shock. And the discoverywe made could mean S100 or more a week in addedsales to every serviceman in the country.
In taking one of our regular surveys, we discovered thestartling fact that most servicemen are unaware of thebroad variety of chemical tools available today. Andthe profits they can build from the extra service callschemicals make possible.
GRIME GETTER. Our TUN -0-BRITE has a controlled polishingaction that powers stubborndirt out of hard -to -reachcontacts. It's also good forunfreezing telescopic antennas, locks, motor shafts andmore.
WRENCH -IN-A-CAN..PLUS.CHEM-0112s penetrating lubri-cating action does thousandsof lobs, from freeing frozen yokesto un-squeaking hinges.
Many servicemen buy three-one for shop: one. home: onegarage.
THE HOUR SAVER. Take SUPERFROST AID, for example. It helpsfind intermittents in minutesinstead of hours. But servicemenhave also used it as. a portablesmall -fire extinguisher. blister-preventer (used on minor burnsimmediately), heatsink beforesoldering...and even chewing -gum remover (cold makes gumbrittle).
Sure, you know about tuner degreasers and cleanerlubricants. And what you know has made ChemtronicsTUN -O -WASH and TUN -O -FOAM the world's best-sellingdegreaser and cleaner, lubricant.
But if thays all you know about chemicals, you'remissing dozens of ways to save time, do a better joband make more profits.
PUSHBUTTON PEACE & QUIET.
One spray of SUPER TROL AID orCONTACT KLEEN quiets noisypots. switches and relays. Someservicemen make a lot ofmoney "curing" noisy transistorradios, balky dimmers, antennarotors..ever thermostats. Not tomention tape recorders. CBsets, marine radv-
LAUGH AT THE WEATHER. KLEER
SPRAY and NO -ARC will help,since they're both excellentinsulators and weather-proofers.
Besides flybacks, antenna ter-minals, splitters, feed-thru's andthe like, you can use them onignition wiring, exposed metals...even wood!
NEW LIFE FOR OLD RUBBER,
DUSTZAPPER. TRACK RECORDS,STICKY STUFF AND SALES. As you
can see. we hove many morelend -a -hand products. Torestore idler wheels and belts.Polish tube guards. Improveperformance of reel-to-reel,cassette and 8 -track recorders.
Clean records. Repair andmend all kinds of materials.And even sell to customerswhile you're in the shop or oncall.
For more information about ourprofessional chemicals. andideas on how to make moneywith them. see your localChemtronics distributor. Orwrite to us for a catalog.
After all, isn't it worth 8C to find outmore ways 52.79 can get you550.00?
r_CHEMTRONICSINCORPORATED1260 RALPH AVE , BROOKLYN, N Y 11236
Our business is improving yours.
56 I ELECTRONIC TECHNICIAN DEA( ER, MAY 197?
. . . for more details circle 109 on Reader Service Card
Selecting That Partnerby Ernest W. Fair
Damon and Pythias established themselves in all
history as the ideal combination of friends and
partners. History hints that their collaboration came
about through mere chance. The truth, without a
doubt, was that their undying loyalty to each other
came from careful selection on the part of each man.
A lasting and successful partner-ship in the electronic servicing in-dustry requires of each individual agreat deal more than knowledge ofbusiness details. The author hasmade a study of what it takes tomake a good partner in the servicebusiness as well as the contributingcauses which lead to the disruptionof new partnerships. This hasbrought up a number of factorswhich stand out as being well worththe consideration of every reader be-fore he enters into partnership withanother electronic technician.
Avoid the business thief who entersinto partnership with us as a meansof building a reputation for gettingestablished in our area and then af-ter a few years-when all of our oldcustomers have been developed intoa friendship-leaves the partnershipto establish a business of his ownnearby.
The law books are full of case his-tories involving damage suits be-tween former partners in businessbased on this very condition. Bysuch a maneuver, a zealous individ-ual can very seriously damage anelectronic service business that wehave taken years to build up.
We, of course, want an ambitiousindividual as our partner. He will beof much greater value than the manwho has no plans for the future. Butthe wise electronic technician canprotect himself from the businessthief by clauses in the partnershipcontract which prohibit such a stepby either partner (usually for fiveyears and within the business areawhere the firm is now established).
Techniques and technical knowledge ofour prospective partner should be ona par with or better than our own orwe will have a source of friction de-veloping within a very short periodof time. When the new partner is"green" to the business, an equalpartnership cannot exist. And wherehis experience and skills are far be-yond our own, we will have to takea back seat to him sooner or later.
Another reason for this point isto assure the harmonious operationof the business. Disputes over smallmatters can lead to big quarrels andtrouble in any partnership. Whenboth individuals have similar viewson what it takes to get the job done,this very big cause of friction willbe removed at the start.
He should have a type of personalitythat can handle the customers thatwe have built up in our establishedbusiness. Good work and good ser-vice naturally build a business, butthe personality of the owner himselfalways has a great deal to do withsustained profits. Not every electron-ic technician has the right personal-ity to operate an electronic servicecenter in any given community. Theman who can manage the most suc-cessful business in one area may bea big flop in another area.
Sufficient resources to hold up his endof the partnership are essential forpeace and harmony in the future andmay very well determine whether ornot the business can survive a periodof adversity.
Entering into partnership with anindividual who is without financialreserves or who is so heavily in debt
that there is little chance of his ac-cumulating any out of the profits ofthe business will mean that we mayhave to carry the entire load duringsuch a period, or if and when a nec-essary improvement or expansionarises in the future, in order to holdour place in competition.
No matter how skilled or how finea personality the prospective partnermay have, if he lacks resources ofany kind whatsoever, we are enter-ing into a partnership which may notsurvive the future and which couldvery well drag the business itselfdown to bankruptcy.
Compatible political, religious and simi-lar beliefs in partners will prove anasset well worth looking into whenselecting a partner. This does notmean that he must go to the samechurch as we do or belong to thesame political party. But it doesmean that if we are politically con-servative it is best that he shouldalso be conservative. And it meansthat if we are devoutly religious, weare asking for trouble by enteringinto partnership with someone whohas little or no religion of any kind.
We may consider ourselves a mas-ter at handling such situations, butin most cases we are fooling our-selves. Beliefs of this nature aredeep set in all of us. Where they arelacking completely in a partner,sooner or later a wide gulf of fric-tion will develop and it will lead totroublesome differences on manyother subjects of even a business na-ture.
What the trade thinks of him is ofvast importance to our future busi-ness welfare. This means what fel-low dealers and electronic suppliers,as well, think about our prospectivepartner. We must always rememberthat a partnership is viewed by oth-ers from the prospective of theweakest man in that partnership,seldom the strongest. And we canwell bear in mind that the credit rat-ing of the weakest partner will soondetermine the credit rating that oursuppliers will give the partnership.
What other dealers and electronicsuppliers think of the man we areconsidering as a partner is, there-fore, of great importance. It will payus to make a very thorough andquiet check-up among these people
continued on page 78
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 57
Fincocongratulates
NATESA and NEAon the success of
the Membership Project!(Concluded March 31,1972)
In Celebration.Finco sets another precedent!
For the months of April, May and June,1972Finco offers to Underwrite a total of...
100 New NATESA memberships100 New NEA memberships
The Finney Company, in making this new offer - looksforward to continued close association and mutual supportwith INDEPENDENT SERVICE, in the common causeof good product quality coupled with unquestioned, effi-cient "INDEPENDENT TELEVISION SERVICE".
This offer is limited to 200 new affiliations(100 NEA - 100 NATESA)
Expires June 30, 1972
SUPERIOR INDEPENDENT SERVICE
FINCO SUPPORTS SIS
THE FINNEY COMPANY34 West Interstate Street
Bedford, Ohio 44146
Morns I. Finneburgh, Sr., E H FThe Champoon of Independent Servo,.
FINCO's Objective:200 TOTAL NEW MEMBERS!100 NEW NEA MEMBERS!
100 NEW NATESA MEMBERS!1. MEMBERSHIP DRIVE STARTS: April 1, 1972 through June 30,
1972
2. All New Members must be signed up and approved by either NEA orNATESA. ($35 - First Year Dues Paid.)
3. Each approved NEW NEA or NATESA Member will receive fromThe Finney Company a GIFT CERTIFICATE good for $35 worthof FINCO PRODUCTS at SERVICE DEALER WHOLESALEPRI('E! When sold to your prospective customer at regular priceappmx: $59.50) you will have received hack your original $35 dues-
PLUS -a $24.50 NET PROFIT! - THAT'S RIGHT! - FINCOis actually making it possible for each new affiliate to make a $24.50profit by joining either NEA or NATESA!
4. FINCO MATV equipment and all FINCO Outdoor Antenna Modelsare included - Rabbit Ears (Indoor Antennas) ARE NOT IN-CLUDED IN THIS OFFER.
5. New affiliates should NOT contact The Finney Company for theirfree Gift Certificates - All questions and correspondence should bedirected to NEA or NATESA Headquarters.
6. NEA and NATESA shall have the sole jurisdiction as to the pro-rating of FINCO Gift Certificates to their respective Districts, Statesor specific areas. Their decision shall be final.
For Further Informationand Details, write to -
NEA_ 1309 West Market St., ITTA Bldg.,0. Indianapolis, Ind. 46222
NATESA- 5908 South Troy St.Chicago, III. 60629
. for more details circle58 I ELECTRONIC TECHNICIAN/ DEALER, MAY 1972
120 on Reader Service Card
Why RCA XL -100's can be a quick fix:
RCA XL -100's are 100% solid state,with 12 plug-in, solid state AccuCircuitmodules-like the ceramic kine drive amplifieryou see above.
Since each of the 12 modules performs specific 'unc-tions, diagnosis of the trouble is usually quick and easy. Mostmalfunctions can be fixed right in the home. That's bound to pleaseyour customer.
So when it comes to servicing RCA solid state color, XL -100's letyou make more house calls-in a lot less time!
And you won't waste so much time hauling sets back and forth tothe shop.
Something else: Whether you're servicing an XL -100 console,table model or portable, most modules are interchangeable, func-tion for function. That will make your life easier, and you won't haveto worry about stocking a large parts inventory
RCA XL -100. It's already got a great reputation.It could even add to yours.
ncn XL -100100% Solid Stole AccuC do' O
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 159
TEST INSTRUMENT REPORT
B & K's Model 1465Triggered -SweepScope with Cali -Brainby Phillip Dahlen
B & K's Model 1465Triggered -Sweep Scope withCali -Brain. For moredetails, circle 900 onthe Reader Service Card.
New scope design simplifies making peak -to -peak voltage measurements
Although many of this scope'sfeatures are the same as those of theB & K Model 1460 Triggered -SweepScope currently being used in ourlab and described in our March1971 Test Instrument Report (page56), this new instrument contains anumber of additional helpful fea-tures well deserving another report.
Modern servicing techniques oc-casionally require that the electronictechnician make precise peak -to -peak voltage measurements ofwaveformsunder test. While initially this wouldseem like a relatively simple mea-surement, such is not always thecase. With some of the more com-plex waveforms spread across ascope's CRT, it is not always quick-ly apparent at what points the maxi-mum positive and maximum negativevoltages occur. After being certainthat the waveform is not subject toany tilt conditions, one peak pointmust be aligned with one horizontalscope gradient and the other peakpoint must be compared with one ortwo other horizontal scope gradientssomewhere else on the scope's grati-cule scale.
Such problems are virtually elim-inated with the Cali -Brain. After ob-taining the desired conventionalwaveform on this scope, one needonly pull the VERTICAL POSITIONcontrol knob to activate the Cali -Brain. This switches OFF the scope'shorizontal trace and the entire wave-form appears as but a single verticalline. If the initial waveform was ob-served on the .lv, .2v, lv, 2v, 10v,20v, 100v or 200v vertical scale,this vertical trace would automati-cally appear along the left verticalgradient-the currently used full-
scale voltage range appearing indigital form above this gradient.However, if instead the initial wave-form was observed on the .5v, 5v or50v vertical scale, the resulting ver-tical trace would automatically ap-pear along the right vertical gradi-ent-the currently used full-scalevoltage range appearing in digitalform above this gradient.
Assume that you were observinga relatively large and complexwaveform on the .1v scale and want-ed to make a quick peak -to -peakvoltage measurement. You wouldmerely pull the VERTICAL POSITIONcontrol knob and the waveformwould instantly become a verticalline running along the left verticalgradient, a ".100 volts full scale"
reading appearing above that gra-dient. With your hand still on theVERTICAL POSITION control, youwould then rotate the control so thatthe bottom edge of this vertical linewas centered at "0." You mightthen happen to note that the topedge of the vertical line extended tosay three markings below the "1"-having observed a 0.85v p -p signal.
Since some of the manufacturer'sspecifications for the Model 1465Triggered -Sweep Scope with Cali -Brain from those forthe Model 1460 Triggered -SweepScope, and since some of our read-ers may not have ready access toour March 1971 issue, we are in-cluding some of the new specifica-tions.
Vertical Amplifier
DC frequency response: DC to 10MHz (-3dB)AC frequency response: 2Hz to 10MHz (-3dB)Risetime: 35nsOvershoot: 3%Input resistance: 1M (approximate)Input capacity: 35pf (approximate)Tilt: 5% or lessMaximum input voltage: 300vdc ac peak or 600v p -p
Sweep Circuit
Sweep system: Triggered and automaticSweep time: ______________ to 20ms/cm, 10 ranges, each providing
fine adjustmentSweep magnification: X5 for each range
Triggering
Type: Internal, line frequency and external (2v p -p orhigher)
Trace slope: Positive or negativeRange: 20Hz to 10MHz, minimum 10mm of deflectionTV synchronization: Sync separator circuit extracts horizontal
and vertical sync pulses.
60 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
The time machineZenith Instant Parts Program
Time is money. And when TV repair workmoves out fast, time saved is happycustomers, too.
That's why Zenith brings you the timemachine-Zenith Instant Parts program.We call it ZIP.
ZIP puts the 100 most -used Zenith qualityexact replacement parts at your fingertips.The parts are catalogued in a specially -designed, compact rack. You can see,instantly, which parts you need, and whichparts need reordering.
As part of the program, Zenith studiesparts turnover by computer. The list of 100
most -used parts is revised everysix months. Any part no longeron the list can be returned for fullcredit, reducing inventory risks.
So put a time machine in your shop. LetZIP help solve your parts availabilityproblem. Ask your Zenithdistributor for details.
At Zenith, the quality goes in beforethe name goes on.'
AfAFPZenith Instant Parts Program
744.----11711
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 161
ANY3
An Extraordinary Offerto introduce you to the benefits of Membership in
ELECTRONICS BOOK CLUBfor a limited time only you can obtain
OFTHESEUNIQUEBOOKS(Combined 9. . . yours for only
...with TrialList Price $33.85 ) Club Membership
May we send you your choice ofany three books on the facing
page as part of an unusual offer of aTrial Membership in Electronics BookClub ?
Here are quality hardbound vol-umes, each especially designed to helpyou increase your know-how, earningpower, and enjoyment of electronics.
These handsome, hardbound booksare indicative of the many other fineofferings made to Members .. . impor-tant books to read and keep . . . vol-umes with your specialized interests inmind.
Whatever your interest in electron-ics -radio and TV servicing, audio andhi-fi, industrial electronics, communi-cations, engineering -you will findthat Electronics Book Club will helpyou.
With the Club providing you withtop quality books, you may broadenyour knowledge and skills to buildyour income and increase your under-standing of electronics, too.
How You Profit From Club Membership
This special offer is just a sample ofthe help and generous savings theClub offers you. For here is a Club de-voted exclusively to seeking out onlythose titles of direct interest to you.Membership in the Club offers youseveral advantages.1. Charter Bonus: Take any three ofthe books shown (combined values upto $33.85) for only 990 each with yourTrial Membership.2. Guaranteed Savings: The Clubguarantees to save you 15% to 75%on all books offered.3. Continuing Bonus: If you continueafter this trial Membership, you willearn a Dividend Certificate for everybook you purchase. Three Certificates,plus payment of the nominal sum of$1.99, will entitle you to a valuableBook Dividend which you may choosefrom a special list provided members.4. Wide Selection: Members are an-nually offered over 50 authoritativebooks on all phases of electronics.5. Bonus Books: If you continue inthe Club after fulfilling your TrialMembership, you will receive a BonusDividend Certificate with each addi-
SPECIAL FREE BONUS. . . if you act now !
Yes, if you fill in and mail the membership ap-plication card today, you'll also get this BonusBook, FREE!
TV TROUBLESHOOTER'S HANDBOOKRevised Second Edition
A completely updated quick -reference soireefor solutions to hundreds of tough -dog troutles.
Regular List Price $7.95
tional Club Selection you purchaseFor the small charge of only $1.99,plus three (3) Certificates, you mayselect a book of your choice from aspecial list of quality books periodical-ly sent to Members.6. Prevents You From Missing NewBooks: The Club's FREE monthlyNews gives you advance notice of im-portant new books . . . books vital toyour continued advancement.
This extraordinary offer is intendedto prove to you, through your own ex-perience, that these very real advan-tages can be yours . . . that it is pos-sible to keep up with the literaturepublished in your areas of interest ...and to save substantially while so do-ing.
How the Club Works
Forthcoming selections are describedin the FREE monthly Club News.Thus, you are among the first to knowabout, and to own if you desire, sig-nificant new books. You choose onlythe main or alternate selection youwant (or advise if you wish no bookat all) by means of a handy form andreturn envelope enclosed with theNews. As part of your Trial Member-ship, you need purchase as few as fourbooks during the coming 12 months.You would probably buy at least thismany anyway . . . without the sub-stantial savings offered through ClubMembership.
Limited Time Offer!
Here, then, is an interesting oppor-tunity to enroll on a trial basis . . . toprove to yourself, in a short time, theadvantages of belonging to Electron-ics Book Club. We urge you, if thisunique offer is appealing, to act
promptly, for we've reserved only alimited number of books for new Mem-bers.
To start your Membership on theseattractive terms, simply fill out andmail the postage -paid airmail card to-day. You will receive the three booksof your choice for 10 -day inspection.SEND NO MONEY! If you are notdelighted, return them within 10 daysand your Trial Membership will becancelled without cost or obligation.Electronics Book Club, Blue RidgeSummit, Pa. 17214.
Typical Savings Offered ClubMembers on Recent Selections
Commercial FCC License HandbookList Price $8.95; Club Price
RCA Color TV Service Manual -Vol. 2List Price $7.95; Club Price $4.95
Citizens Band Radio Service ManualList Price $7.95; Club Price $4.95
How to Use Color TV Test InstrumentsList Price $7.95; Club Price $4.95
FET Applications HandbookList Price $14.95; Club Price $9.95
Fire & Theft Security SystemsList Price $7.95; Club Price $3.95
Modern Radio Repair TechniquesList Price $7.95; Club Price $4.95
Beginner's Guide to ComputerProgramming
List Price $9.95; Club Price $6.95199 Electronic Test & Alignment
TechniquesList Price $7.95; Club Price $4.95
Zenith Color TY Service Manual -Vol. 2List Price $7.95; Club Price $4.95
Transistor Projects for Hobbyists& Students
List Price $7.95; Club Price $4.95Electronic Musical Instruments
List Price $7.95; Club Price $4.95Electronic Designer's Handbook
List Price $9.95; Club Price $5.95Dictionary of Electronics
List Price $6.95; Club Price $5.50Computer Circuits & How They Work
List Price $7.95; Club Price $4.95Japanese Color TV Service Manual
List Price $7.95; Club Price $4.95Solid -State Circuit Design & Operation
List Price $9.95; Club Price $7.95How to Read Electronic Circuit Diagrams
List Price $7.95; Club Price $3.95Electronic Test & Measurement Handbook
List Price $7.95; Club Price $4.95Computer Technician's Handbook
List Price $10.95; Club Price $7.95125 One -Transistor Projects
List Price $7.95; Club Price $4.95Servicing Modern Hi-Fi Stereo Systems
List Price $7.95; Club Price $4.95
SENDNO MONEY! Simply fill in and mail postage -paid Airmail card today!
62 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
Color TV Trouble Factbook Basic Electronics Problems Solved 199 TV Tough -DogProblems Solved
Here's a complete guideto color TV troublesand solutions, arrangedby make and model, alow -coat, all -in -one ref-erence handbook everyTV service technicianshould own. The infor-mation it contains mayeasily save you hoursof time repairing a"tough -dog" color TV.Included are detailsconcerning repetitivetroubles, field -factory
changes, new and unusual circuits and de-scriptions of how they work, special adjust-ment procedures and other such pertinent ser-vice information. The content is arranged bybrand names, covering every major make ofcolor TV receiver produced in the past severalyears. Models and chassis covered are arrangedin alpha -numerical order. 176-pps. Hardbound.
List Price $6.95 Order No. 519
Philco Color TV Service Manual
PHILCO
TROUBLEFACTBOOK
An all -in -one serviceguide for Philco colorsets, with 12 completeschematic diagrams forchassis 15M80/91 to20QT88. Here in onemanual is completeservice data for all thecolor models producedby Philco and PhilcoFord (thru 1970), fromthe all -tube to the lat-est hybrid solid-statechassis, including thesmall -screen portable
Model T5062WA. The unique 36 -page foldoutsection contains 12 complete schematic dia-grams, representing all the chassis covered.The profusely illustrated text delves into eachsection (video, chroma, vertical, horizontal,etc.), and points out specific problems based onthe author's extensive experience. Includedare complete alignment and setup instructions,detailed in step-by-step form. 160 pps., plus36 -page schematic foldout section. Long -lifevinyl cover.
List Price $7.95 Order No. 522
CB Radio Operator's Guide
CB RADIO
awart1, Ur It Pm
An all -in -one handbool,on Citizens Band radio,and how to make thebest use of availableequipment. Tells youeverything you mustknow to get on the air,with complete detailson what you can andcan't do right down tothe "nitty gritty" rulesand regulations! What'smore, you receive ex-pert advice on the typeof equipment to buy.
and how to get the best performance out ofyour "system." The information contained inthis book will save you time and money inshort order! With this one book, you can be-come an expert on CB Radio, and how to usethe service most successfully. You'll learnabout antenna systems, including how theyare used in CB. 224 pps. Hardbound.
List Price $7.95 Order No. 499
Here are easy step-by-step solutions to basicelectronics problems ina convenient one -stopsource dealing with bothsolid-state and tube -typecircuits. The contentnot only presents a de-tailed explanation ofeach point, but also pro-vides many actual ex-amples on how to workout problems. Then, tofirmly fix the informa-tion in your mind.
there are numerous example problems for youto solve: answers to these are included in oneAppendix, and worked out solutions in another.Covers DC circuits, AC circuits, powers of ten.semiconductors, power supplies, and receivercircuits. A final chapter shows how to use aslide rule to speed calculations. 192 pps., over100 illus. Hardbound.
List Price $7.95 Order No. 530
101 TV Troubles: From Symptomto Repair
101
TV TROUBLES
V Mil 1141.001.18
SOLVED
An invaluable "causeand cure" guide to thepractical, easy solutionfor virtually any TVtrouble-color or B&W.All you do is analyzewhat you see and hear,look up the symptomsin the book, and followthe clear and simplesteps to a speedy trou-ble cure. To show howand why certain trou-bles occur in specifictypes of circuits, sche-
matics and other illustrations are included forevery major manufacturer-Admiral to Zenith.TV troubles are broken down into five basiccategories: Brightress, Contrast, Sweep, Color,and Sound. Each category lists specific trou-bles relating to that symptom. For example,under "Contrast" are 22 causes of actual pic-ture problems. With the categorized troublelist and index, you can quickly and easilyfind the exact symptom-and the trouble cure-for virtually any TV circuit defect youmight encounter. 224 pps. Hardbound.List Price $7.95 Order No. 507
How To Fix Transistor Radios &Printed Circuits
Row Mb
TRANSISTOR
RADIOS &
Frigid
CiftlillS1010001 Eli MIN11011111t LAE
Here it is! Just off thepress-a complete:y up-dated, revised edition ofLeonard Lane's best-selling classic on tran-sistor radio repair. Inaddition to extensiveenrichment of the firstedition, the authorbrings FETs, zener di-odes, FM radios - infact, everything relatedto the current state ofthe art-into the pic-ture. Here's the perfect
reference and guide for electronic technicianswho need to understand and repair semicon-ductor circuits efficiently. For those interestedin transistor physics, fundamentals are em-phasized in the first two chapters. The real"meat" begins in Chapter 3 which will thor-oughly familiarize you with amplifier funda-mentals. basic circuit configurations, biasing,FETs, JFETs, and IGFETs. The next twochapters will acquaint you with RF and IF'amplifiers. 256 pps., over 150 illus., 12 Chapters.
List Price $7.95 Order No. 504
If you want to get thebest performance out ofconsumer electronicsequipment, you'll findthis to be the most in-formative and usefulhandbook ever pub-lished. Over 150 ideassuggest ways to custo-mize and add accessor-ies to any equipmentsetup-how to connectsingle and multiple ac-cessory speakers, how toadd remote controls to
TV's. radios. hi -fl systems, how to connectmicrophones. etc. Also includes many tips onhi-fi equipment, CB and 2 -way radio equip-ment, antenna systems, remote monitoringtechniques, intercoms, a wireless baby sitter.telephone amplifier, moisture, fire and otheralarm accessories for any existing amplifier.256 pps., over 150 illustrations. Hardbound.
1(..)9 TV TOUGHDOGPROBLEMSSOLVED
Here is a master collec-tion of actual case -his-tory solutions-answersto the most challengingtough -dog TV problemson both color and It &W- sets-covering allpopular makes fromAdmiral to Zenith. Thisnew book is organizedso that you can quicklyfind the solution toparticular problems-toughies that requiredthe best efforts of top
technicians to solve. To enable you to find in-formation relative to a particular problem ina specific set, a cross-reference of troubles bybrand name and chassis is included. The con-tent is organized into trouble symptom sections.Several different circuits are included; thus.the information provided will apply to similarcircuits in other models. 256 pps., 199 illus.Hardbound
List Price 57.95 Order No. 559
TV, Radio, Hi-Fi Hints & Kinks
TV-Rodic & Hi -RHIITS &KINKS
List Price 57.95 Order No. 561
Electronic Circuit DesignHandbook
EMI
New Third Edition-Abrand-new, enlargededition of the ever pop-ular circuit designer's"cookbook," now con-taining over GOO provencircuits, for all types offunctions, selected fromthousands on the basisof originality and prac-tical application. Nowyou can have, at yourfingertips, this careful-ly -planned referencesource of tried and
tested circuits. Selected from thousands sub-mitted by distinguished engineers, these"thought -starters" are a collection of originalcircuits selected on the basis of their useful-ness. This detailed compilation of practical de-sign data is the answer to the need for an or-gan:zed gathering of proved circuits . . . bothbasic and advanced designs that can easilyserve as stepping stones to almost any kindof circuit you might want to build. 384 pps.,19 big sections, over 600 illus.. 81/2" x 11".List Price 517.95 Order No. T-101
N EXTRAORDINARY . for more details circle 106 on Reader Service Card
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 65
COLORFAX
The material used in this section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.
EMERSONColor -TV Models 35P03,35PO4-Repairing Convergence Yoke
Many Part No. 981922 convergence yokes have beenreplaced because of a broken plastic screw on the yoke
BROKEN SCREW, CLIP (587238)
clamp. A spring clip, Part No. 587238, is now available sothat these yokes may be repaired as shown in the illustration.
GENERAL ELECTRICColor -TV Chassis Cl/LI-Troubleshooting Guide
Symptoms of no raster or sound can be caused by anopen resistor (2R406 or 2R404). In early production
.00F/t 1,40,
0,11
- 4,4 .406 -,0,t, 21407 2C0821.40°' T T 005
2009 - 3500 300.0 400v IVY
P XXIIIApo + 280V
'39
models replace the 2n, 10w resistor with a 2(1, 15w re-sistor, Part No. EP I4X9. In later production models, re-place the HI, 15w resistor with a Mt 22w resistor, PartNo. EPI4X24.
A no raster problem can be caused by an openresistor 2R407. The chassis will then not have the 22v B+source voltage, which causes the horizontal output tube
/C;7133900
7 hv
, 193 79 7RZEII43W1( 431,0k 4
3 3W / 2W 11253"Ish 10011
'103,
- TO
7C/79130 t,KV - bi.M
6KV
J202'IN 7
01 3
VII191.7,3PAMPER
72 4.10 7C2-.41006* ,.IW 71../55* 5K.
FOCUS IKV 17)1,11209.-I(
- 4 702
J2 1)I H ISIS IPIN 7 ON , ,
23" MODELS
77. 2 73 .i7L254.1 L 1006
I- 280V
26HU5 to run hot, and the circuit breaker to trip. Thissame condition can also be caused by a shorted or lowresistance zener diode 2Y405.
No raster or sound troubles can be caused by an open
filament in damper tube 19CG3 and open coil 7L254.When the damper tube is replaced, the TV set will havesound but no raster until coil 7L254 is replaced.
Other no raster symptoms can be caused by a shortedhorizontal oscillator transistor, Q503, or a shorted hori-
5R3.'fI
4- -+22V
I9V
5R26215L251 330W HOR
HOLD
5C26i0069
-Iv
051)3NOR. CSC
+280V
05040011 DISL. 519178
47K
5 C2 6 T
180V
IV2V -I(519261 5R.'63396 470 3mh
.1721,15 1,6
5C266270
+22V
zontal discharge transistor, Q504. The shorted transistorswill cause the 26HU5 tube to run hot and the circuitbreaker will trip.
.01
39K5.Y.
V.c207047 I#5370/61
= 5+22271
* V I 0" 50 wTPH ON ou I Put/ 200 11,11,11T
T. RXII
51'253 !.025218
tRe8o*(7R2/9 61,
100 5W,VVV- -07
/5-,T -4- 20')V
V.%
160V
51927457.2,04 502/I `T, 401,
1, II 0 5 I* 7
5R 276821151/4
PuCV.005
lE
3')K.'V.A.'1280V
5192774/K5%
A dim raster condition can be caused by a shorted ca-pacitor, 5C27I. Replace this capacitor with one having a400v rating, Part No. EP25X4 or equivalent.
;,v14 iv
319173
1,---10 +22V3RI74 I 31172 3C173
1506 820 .,soo
3 5v
TO
030114.3\T
TO BASE
iS T VIDEO
0303 A I75V30174 r I4.90
3,117: 410I 319177
470.T903RI76330
+22v
03042ND
v1DE0 4.56.4,1 DEL .4Y LINE
/34,8i=
Intermittent video problems can be caused by an in-termittent second video transistor, Q304.
-/7V+Iv
0303 -422VEMITTER 0302
AGC 1--3)703 LOWER
7 !R20110S
/6.5V140
3R4g6 `; '3C200
37201 TO800
3Rzo. +22V Br470
30201
-i- 2 2 V
72
36204
31.2039K
A.0
5C202.047
592096.66
5R2113306
/VI.4V
51120927K
r 0501S7NC SEP
40V'08v
8v5020/
722
--No AGC conditions could be caused by an open diode,
3Y201; while loss of horizontal or vertical sync can becaused by a shorted diode, 5Y202.
Intermittent or no color conditions can be caused by a
66 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
TO0 301
EMITTER
113C560
T.P. V 4 8 r - - - -I201- i/e H' 14 II 180V B A',:(jF.,A' SS I
CHROMA ,,,,,,I f Vv 3 4 I
Tr 3L501CHROMA
150
3CO23R501 #
1
:K 13650350
3(.503T .01
5 1- -1
_J
25
5l+.11 3(.504..1( 910
2W
+280Vburned resistor 3R504. The lead of the resistor shorts tothe bandpass transformer can.
RCA SALES CORPORATIONColor -TV Chassis CTC40,44,47-Servicing SCR Sweep Systems
A poor, but common troubleshooting technique is thepractice of jumpering the circuit breaker to locate B+shorts-often making a difficult service job out of a rela-tively simple one because of additional component failures.Locating the induced problems usually requires more in-volved troubleshooting techniques than finding the originalone.
One example of this can become quite evident when ser-vicing the SCR sweep system. In the event the retrace SCR(SCR 102) or retrace diode (CR 402) fails (shorts), the155v supply is connected to ground through the input re-actor (T102) primary winding. Consequently, the circuitbreaker will trip-the normal protective action. If circuit
Retrace R(155v) L104 P(155V) C403 7(0v).L ( 01o)Diode
RetraceSCR \411/4FROMROM Z
OSC PW500G1.0V)
InputReactor 8+
(15O -160V)
AB(160V)
SCR 101
(35V)*(48V)s
(541.)(40v)'
action is defeated for only a short time (4-8 sec) either byholding the breaker "in" or by jumpering, the input reactorwill be overloaded, resulting in the possibility of shortedturns.
Now, after the original defective component (shorted re-trace SCR or retrace diode) is replaced, a new inducedsymptom of "no high voltage, circuit breaker holds" will heevident. Additional servicing time will he required to findthat the trace SCR has no gate pulse because the input re-actor has shorted primary turns.
Also, damage to the filter choke and/or power transfor-mer can he expected if the chassis is operated for anylength of time with the circuit breaker jumpered. Currentinstruments utilizing such chassis as the CTC46, CTC49and CTC54 have a fuse in series with the circuit breakerfor protection in the event that breaker action is defeated.
Heathkit "Profit -Makers"pay-off in price
and performance
NEW IB-1102 120 MHz '-FREQUENCY COUNTER Ca,
Another Heathkit first! An eight-iigit counter with illuminated overrange,gating, kHz and MHz indicators. Preassembled temperature compensatedclock assures overall accuracy. High -impedance, low -capacitance (FET) input circuit. presents minimum loading. Automatic triggering level permits"hands-off" operation. Sensitivity is 50 mV to 100 MHz, 125 mV above 100MHz. The 1102 will accept inputs up to 120 V rms from 1 Hz to 150 Hz,50 V at 40 MHz, and 3 V at 120 MHz. Stability is 7ti1 ppm from +10° to+40° C, and aging rate is less :han +1 ppm per year. Other features in-clude ECL circuitry, 1 Hz resolut:on without switching time base, 120/240VAC operation, portable case with bail handle and detachable line cord.Assemble yours in an easy 15 hours.Kit IB-1102, 12 lbs. 349.95*
IM -102 DIGITAL
MULTIMETER
Measures AC and DC voltage, current, and resistance, with automaticswitching for DC polarity. Five overlapping ranges show voltage from100uV to 1000V on DC; 5 ranges cover 100uV to 500V on AC; 10 rangesmeasure 100nA to 2A, AC or DC 6 resistance ranges cover 0.1 ohm to 20megohms. Input impedance is 1,000 megohms on the 2V range, 10 meg-ohms on higher ranges, with overload protection on all. 31/2 digits for100uV resolution on 200mV range, 1V on 1000V. Automatic decimal point.Panel light indicates over -range. DC calibrator, furnished assembled, andunique transfer method allow calibration to 0.2%. Unit can be lab cali-brated to 0.1%. Kit inc'udes standard banana jack connectors completewith test leads. Assembles in approximately 15 hours. For lab spec per-formance on a budget ... order iour IM -102 today!Kit IM -102, 9 lbs. 229.95*Kit 10-1041, high -voltage probe accessory, 1 lb. 6.95*
10-103 5" TRIGGERED
SWEEP SCOPE
Maximum flexibility in a general purposescope, at a price to fit any budget ... thenew Heathkit 10-103 is a tech's dreamcome true! Big 6x10 cm screen with light-ed graticule for easy, accurate measure- .!1-)/.ments. DC -10 MHz +3 dB resaonse with .less than 50 ns rise time on ve:tical chan-nel. Horizontal expansion gives x2 magni-fication -+ 5% for a 50 ns/crn sweep rate. Triggered sweep, too, withselection of either normal or automatic modes. Other features are switchcontrolled AC -DC coupling; provision for external triggering signals andhorizontal deflection signal; frcnt-mounted connectors for vertical inputsand IV peak -to -peak signal for checking calibration; 120/240 VAC opera-tion. Put this budget -minder to vork for you now.Kit 10-103, 37 lbs. 229.95*
r
L
HEATHKIT
HEATH COMPANY, Dept. 24.5Benton Harbor, Michigan 49022Li Enclosed is $
Please send model(s
Schlumberger
plus shipping.
Please send FREE Heathkit Catalog.
Name
Address
City_ State Zip
Prices & spec fications subject to change without notice.*Mail order prices; F.O.B. factory. 7E-264
for more details circle 124 on Reader Service Card
MAY 1972, ELECTRONIC TECHNICIAN/DEALER j 67
WIRED$59 95 Start your custom
Burglar/Hold-up/Fire AlarmSystem with the FC-100.Add on Sensors, Alarmsand Accessories to suit yourown needs.
"Do -it -Yourself" InstallersHandbook included. Notechnical knowledge needed -No soldering.
1000o Professional in Design, Reliability,Performance.
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A
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SEND FORFREE SAMPLE
NO RESIDUE NON-FLAMMABLE
NON-TOXIC NON-CONDUCTOR
A CHEMICALLY PURE CLEANING AGENT
WITH:
1. SELECTIVE CLEANING POWER- removes greases, oils, dirtand organic soils with no effecton the article being cleaned.
2. EXCELLENT PENETRATINGAND WETTING ACTION - Itshigh density and low surfacetension permits maximum pen-etration of most minute crev-ices where its superior wetting oaction then cleans even mostdifficult materials.
3. PURITY - evaporates com-pletely - leaves NO residue.
4. SAFETY - Non -explosive, non-flammable, non-toxic.
5. STABILITY - does not reactchemically with other materials.
Available in 7 & 16 oz. aerosolswith "Snorkel Tubes"
LPS RESEARCH LABORATORIES, INC.2050 COTNER AVENUE, LOS ANGELES, CALIFORNIA 90025
PHONE: (213)478-0095
for more details circle 129 on Reader Service Card
PT LAST! PROFESSIONALHOME PROTECTIONEVERYONE CAN INSTALLAND AFFORD.
Model FC-100 FeNSafe'
SECURITY CONTROLCENTER
O
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FREE 32 PAGE EICO CATALOGFor latest catalog on EICO Test Instruments. Stereo, EICOCRAFTProjects. Environmental Lighting. Burglar/Fire Alarm Systems,and name of nearest EICO Distributor, check Reader ServiceCard or send 25c for First Class mail service.
EICO, 283 Malta Street, Brooklyn, N.Y. 11207 EICOL7
TECHNICAL DIGEST
The material used in this section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.
RCA SALES CORP.Varactor Diodes
The technique of using a vacuum tube as a variablereactance was well known many years before the adventof TV. Numerous examples of this technique may befound in earlier TV receivers; e.g., reactance controlledhorizontal oscillators and reference oscillators. The useof a diode instead of a reactance tube allows a simplercircuit with the advantages of solid-state design. To under-stand how a varactor diode functions, it is necessary toconsider the conditions which exist at its P -N junctionwith various applied voltages. If the diode is forwardbiased, current flows, the impedance is very low, and anycapacitance which may exist across the junction is effective-ly short-circuited. Thus the varactor is operated reversebiased.
The conditions within the varactor diode when it is re-verse biased is shown in the illustration. When a positivevoltage is supplied to the "N" or cathode material and anegative bias is applied to the "P" or anode material, thecurrent carriers are attracted away from the junction,forming what is called a "forbidden region." Stated simply,
POSITIVESUPPLY
NEGATIVTSUPPLY
FORBIDDENREGIONS
POSITIVESUPPLY
this forbidden region is that portion of the semiconductormaterial on each side of the junction wherein "free elec-trons" and "holes" cannot exist, and therefore the materialin this area is essentially an insulator.
As the reverse voltage is increased, the size of the for-bidden region also increases. In effect the thickness of theinsulating material has been increased by the additional re-verse bias. Since the regions of the semiconductor materialin which current carriers can exist exhibit the properties ofconductors, the requirements of a capacitor (two conduc-tors separated by a dielectric) are fulfilled by the reverse -biased diode. Further, the "thickness" of the dielectric, andhence the amount of capacitance, may be controlled bychanging the applied voltage. Thus, the reverse -biaseddiode can be used as a variable reactor, or varactor.
. for more details circle 116 on Reader Service Card
68 IELECTRONIC TECHNICIAN/ DEALER, MAY 1972
GREATEST TV Schematic Bargain EVER Offered
NOW -Complete IV Schematics for less than eachCOLOR TV BLACK & WHITECovers ALL Coverage forColor Sets 23 U.S. Brands1960 - 1968 1965 - 1968
TV TECH / MATICS -8 Giant Volumes
Cover 99 of Color TV -4 Years B&W !
Here are FABULOUS savings onnationally -known TV schematic andservice data. Here is everythingyou need to fill your vital servicedata needs for TV model years 1965through 1968 . . . plus COLOR TVcoverage from 1960 through 1968!What it amounts to is a low, lowcost of less than $9.00 per year foryour TV service data . . . with anextra 5 years of Color TV coveragethrown in for good measure!Compare that with the over $100 ayear you may now be paying forcomparable information.
SERVICE DATA FOR MORETHAN 20 BRANDSTV TECH MATICS is the ideal Ser-vice Data package for today's mod-ern technician. It includes com-plete schematic diagrams and vitalservicing data for every TV receiv-er produced by more than 20 lead-ing American Manufacturers for1965, 1966, 1967, and 1968. All dia-grams and servicing details arecompletely authentic, based on in-formation provided by the originalequipment manufacturers. Eachyear's coverage is permanentlybound into two convenient -to -usevolumes which open flat to 11" x291/2", ready to provide you with in-stant service data at your work-bench. Some of the diagrams areas large as 58" x 22".
EASY TO USETV TECH MATICS is easy to use.Brand names are arranged alpha-betically by model year. No morehunting through several file draw-ers to find the schematic you need!And at the special low price, thinkof the savings you will enjoy onyour schematic needs . .. think ofthe time you'll save by having theschematics you need right at yourfingertips in handy, permanently -bound form!TV TECH MATICS is the ideal wayto cut down your schematic expen-ses, and to enjoy the convenienceof having all your data needs rightat your fingertips.
8 BIG Volumes
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for only $34.95HERE'S WHAT YOU GETYou receive 8 BIG volumes in all,two for each year from 1965through 1968. Included is a clearlydetailed and annotated TV sche-matic diagram for each specificmodel. You also get complete re-placement parts lists, alignment in-structions, tube and component lo-cation diagrams, plus key wave-forms and voltage readings ... allthe information you need to serviceover 90% of the TV receivers you'llencounter!
STREAMLINED AND CONVENIENTAll the information for a given mod-el is contained on two facingsheets. The special bound -leaf for-mat allows pages to lie flat whenopen. Each volume is organ zed al-phabetically by manufacturer, thennumerically by model number. Inaddition, a handy Chassis ModelFinder is bound into each volume.Regular list price for each year'scoverage - 2 BIG volumes - is$19.90. All 8 volumes normally sellfor $79.60. Your price is ONLY$34.95... a savings of nearly $45.00!
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MONEY -BACK GUARANTEEYou MUST be satisfied that TVTECH MATICS is the greatest bar-gain in TV Schematics ever offered.Order at our risk for FREE 10 -dayexamination. Prove to yourself theyare worth many times the price.You can return them in 10 days forfull refund or cancellation of in-voice No need to send money. But,the supply is limited, so fill-in andmail the NO -RISK coupon today toobtain these time -saving, money-making manuals.
-CONTENTS-CONTENTS 1965 MODELS
Covert all 1965 models for: Admiral, Airline,Andrea, Coronado, Curtis Mathes, Dumont, Electrohone, Emerson, Firestone, General Electric,Magnavox, Motorola, Muntz, Olympic, Packard -Bell, Philco, RCA Victor, Sears-Silvertone,Setchell-Carlson, Sylvania, Truetone, Westing-house and Zenith . . . plus all color sets 1960-1965, at no extra cost!PUBLISHER'S LIST PRICE $19.90
CONTENTS 1966 MODELSCover.: all 1966 color and B & W models of: Admiral, Airline, Andrea, Coronado, Curtis Mathes,Dumont, Emerson, General Electric, Hoffman,Magnavox, Motorola, Olympic, Packard -Bell, Phil -co, RCA Victor, Sears-Silvertone, Setchell-Carl-son, Sonora, Sylvania, Truetone, Westinghouse,and Zenith.PUBLISHER'S LIST PRICE $19.90
CONTENTS 1967 MODELSCover; all 1967 color and B & W models of: Ad-miral, Airline, Andrea, Coronado, Curtis Mathes,Dumont, Emerson, General Electric, Hoffman,Magnavox, Motorola, Olympic, Packard -Bell,Philco-Ford, RCA Victor, Sears-Silvertone, Setch-ell-Ca-lson, Truetone, Westinghouse, and Zenith.PUBLISHER'S LIST PRICE $19.90
CONTENTS 1968 MODELSCovers all 1968 color and B & W models for: Ad-miral, Airline, Andrea, Coronado, Curtis -Mathes,Dumont, Emerson, General Electric, Hoffman,Magnavox, Motorola, Olympic, Packard -Bell, Phil-co-Fo -d, RCA Victor, Sears-Silvertone, Setchell-Carlson, Sonora, Sylvania, Truetone, Westing-house, and Zenith.PUBLISHER'S LIST PRICE $19.90
1
-LARGE PAGES contain complete circu t schematics, replacement parts lists, alignment instructionscritical part locations, important waveforms and voltage readings.
TAB Books, Elue Ridge Summit, Pa. 17214I enclose $34.95 for which please send me your complete 8 -Volume Tech Matics Schematic offerpostage prepaid.
Please invoice me for $34.95 plus postage. Same return privileges.
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ET -52
1
for more details circle 105 on Reader Service CardMAY 1972, ELECTRONIC TECHNICIAN/ DEALER I 69
meet the
metricsXcelite's where the Metrics are!A great variety of tools and sets to help you turnmost any Metric fastener or adjusting screwyou're likely to encounter ... hex socket set
screws and cap screws, hex nuts, hex head capscrews, and whatever.
All tools precision made for exact fit. Brightnickel chrome nutdriver shafts and protectiveblack oxide finished hex socket screwdriverblades. Plastic (Ut ) handles shaped for perfectgrip and balance
FIXED HANDLE NUTDRIVERS
NUTDRIVER SHANKS & HEX SOCKET SCREWDRIVERBLADES for use interchangeably in Series 99 plainand ratchet type handles.
1,000101.41112r.
COMPACT SETS
No. 99 -PS -41 -MM(7 Metric hex socketblades, extensionand handle)
No. 99 -PS -51 -MM
(10 Metricnutdriver shanks,extension andhandle)
REQUEST CATALOG
nationwide availability throughlocal distributors
XCELITE, INC 14 Bank St., Orchard Park. N.Y. 14127In Canada contact Charles W. Pointon. Ltd.
for more details circle 140 on Reader Service Card
70 ELECTRONIC TECHNICIAN/DEALER, MAY 1972
NEW PRODUCTS
For additional information on productsdescribed in this section, circle thenumbers on Reader Service Card.Requests will be handled promptly.
PLUG-IN BRIDGE RECTIFIER 703
Has ratingsof 1.5a
Designated the BRPI.500 series,this single-phase bridge rectifier has arating of 1.5a andutilizes a standardJEDEC eight -pin oc-tal base. Reliability isenhanced by the useof non -cavity fullyglassivated diode ele-ments with all diode -to -diode interconnec-tions being welded. Rectifier Compo-nents Corp.
RCC,FRp1.501,
DUAL TRACE SCOPE 704
Provides complete dual traceand X -Y capability
A solid-state dual trace, triggeredsweep dc to 15MHz scope is the kitversion of the scope described in de-tail in our September, 1971 Test In-strument Report. Designated the 10-105, this kit provides complete dual -trace and X -Y capability. Two sepa-rate inputs can be individually dis-played in Channel 1 or Channel 2
modes. Both input channels are bal-anced for less than 5% phase shift to50kHz. Versatile triggering facilitiesare included in the kit. Switch select-ed ac or dc coupling permits trigger-ing at a given point on the signal orat a pre -selected dc level. Automatictriggering at the crossover point isavailable at a flip of a switch. Positiveor negative slope triggering is alsoswitch selectable. Internal, externaland line inputs are provided. An 18 -position time base switch in a 1, 2, 5sequence gives sweep rates from
100ms/cm to 0.2µs/cm. Separatevernier control with calibrated posi-tion allows continuous control be-tween settings. A five -times magnifierpermits detailed trace viewing. Otherfeatures include a rear panel sweepgate output delivering a 3.5v pulse insync with the sweep for special appli-cations; TTL-compatible externalblanking input; 8 by 10 cm rectangu-lar flat -face CRT with standard cam-era mount on bezel; and removableside panels for easy accessibility.Price: $399.95. Heath Co.
PLUG-IN FUSEHOLDER 705
For PC board mountingand easy fuse removal
The Series 281007 rectangularshaped, sub -miniature fuseholder,0.260 -in. high by 0.244 -in. wide by0.276 -in. deep, is made to accommo-date both microfuses and picofuses.The low profile fuseholder is molded ofwhite acetal resin and is rated to 5amaximum at 125v ac. It has two 0.047 -in. by 0.020 -in. thick silver plated phos-phor bronze printed circuit board
terminals, which extend 0.177 in.from the base of the horizontalmounted fuseholder. The fuseholder,when mounted near the edge of theprinted circuit board, permits thetechnician to reach the fuse for easyremoval and assembly without havingto disturb other electronic compo-nents on the board. Littelfuse, Inc.
SWITCHES AND RELAYS 706
For PC board and lowvoltage applications
The switch line consists of eightsubminiature toggle switches and twosubminiature push-button switches.The 11 new relays are subminiaturetypes intended for PC board and otherlow voltage applications. A choice ofthree popular coil voltages are offered
in the 3a contact rated open -frametype, and on both the la and 5a
covered PC type relay. Two dry -reedrelays are also included. InternationalRectifier Corp.
TRANS-VERTER 707
Converts 220v ac powerto 110v ac power
The Trans-verter Model No. 50-123has been developed to convert Euro-pean and oth-er foreign 220vac power to110v ac stan-dard U.S. pow-er. This 8 lbweight unit isthe answer forthe many peo-ple who wouldlike to operate their 110v ac appli-ances while overseas. Suggested retailprice: $24.50. Terado Corp.
COAXIAL -CABLE STRIPPER
Self-contained, requiringno external power supplies
The TW-6 stripper is used for slit-ting as well as for circumference -cut-ting on all types of cables up to 5/8 -in.diameter, a special fixture at the endof the stripper having two slots intowhich the cable is positioned. One ofthese slots provides circumferencecutting, while the other provides aslitting action. This tool is said to be
708
self-contained, requiring no externaltransformers or power supplies. Twomodels are offered. One has a fixedoperating temperature of 1700°F (for
use on high -temperature insulationsonly). The other model features asolid-state temperature control ad-justable from 100° to 1700°F. It isused on the full range of available in-sulation materials. Jensen Tools andAlloys.
MIXER/POWER AMPLIFIER 709
Provides 75w rms power fromeither ac or dc power source
Designated Model 1607A, a newfive channel mixer/power amplifierprovides 75w rms power from either
- I q; c3
- Ye MIS - -aau
an ac or dc power source. It incorpor-ates a new low noise mixing circuitand switchable input gain, a built-intest oscillator which furnishes conven-ient system level adjustments, 5 mix-ing inputs with controls, plus a visualoverload indicator and circuit breaker
continued on next page
"STAR-TRACK" the mostAdvanced Space -AgeVHF/UHF/FM ColorAntennas ever introduced!
Similar designto antennasused in spaceprogram.
U.S. PatantNo. 3,440,658
Corner Reflector Driven Disc Director Array for totalUHF coverage!
Multiple Tuned, Cut -to -Channel VHF Elements for totalVHF and FM coverage!
Maximum construction for long installation life! Exclusive Reynolds Aluminum COLORWELD durable
baked enamel Gold finish! Includes RMS SP -332 VHF/UHF Splitter for economical
single down -lead installation!
RANGE OF RECEPTIONModel VHF UHFSK -716SK -1117SK -1519
SK -13SK -15SK -19
Up to 50 milesUp to 125 milesUp to 150 miles
Up to 50 milesUp to 75 milesUp to 100 milesUp to 25 milesUp to 50 milesUp to 100 miles
Write for RMS ELECTRONICS, INC.CatalogProfit 50 Antin Place, Bronx, N.Y. 10462Details! Tel. (212) 892-6700
See RMS at CES Show-Booth 321.
. for more details circle 135 on Reader Service Card
Low Cost Blue Lateral and Purity Assembly
New low cost single -unit blue lateral and purity assembly No. 7605replaces similar assemblies on any size rectangular color picture tubewith a triangular dot pattern.
List $5.50. Dealer Net $3.30; available from distributors' stocks.
Write for 92 -page Coil Replacement Gttide 172
J.W. MILLER COMPANY19070 REYES AVE. P.C. BOX 5825 COMPTON, CA. 90224
. . . for more details circle 131 on Reader Service Card
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 71
WORKMANSubsidiary of INN TECHNOLOGY INC.BOX 38?,9 SARASOTA FLA 335,8 PRODUCTS, INC.
for TV and RADIOS
OCTAL NOVAR PRINTEDCIRCUIT TUBE and MINIATURESOCKETS. SEVEN, NINE, TWELVEPIN PLUG SOCKETS with NUVIS-TOR, TRANSISTOR, SILICONRECTIFIER, CRYSTAL ANDGENERAL PURPOSE SOCKETS.Individually packaged for pegboard display
Ask For CROSS REFERENCE X68.
. for more details circle 139 on Reader Service Card
NOW SOLVED ...A tough problem* that has beenwith us since long before thetransistor was invented!*a way to check transistors, capacitorsand resistors without unsolderingthem from the circuit.
Saves time and tells you more than theold hazardous way of unsoldering com-ponents from the circuit. Connect thetransistor tester to your scope and getrapid readings on transistors, diodes,capacitors, and resistors. Symbol on faceof tester shows scope pattern for eachgood component.
$29.95 Postage PaidSend check or money order (no C.O.D.) to
ayeadvanced applied electronics
1000 South Main StreetCouncil Bluffs, Iowa 51501
712/328-8625
NEW PRODUCTS...continued from page 71
to provide full amplifier protection atall times. One reportedly new featurein package amplifiers is the 1607A'sexternally available 60011 line levellink between the mixer/line amplifierand the power amplifier input. Thislink may be used either unbalanced orbalanced with optional plug-in trans-formers. Altec.
CLEANER 710
Has fast penetratingaction
The LPS No. 1
cleaner reportedlyhas fast penetratingaction, purity, a slowevaporation rate andcovers the productsprayed with a cor-rosion resistant coat.The cleaner is avail-able in 2, 7 and 16oz. aerosol cans.LPS Research Labs.,Inc.
1,4Lubricates
stops Rust
1Ni GREA EEEEE 5
LINE DROP TAPS 711
Low loss ac/dcpassive units
Line drop taps, Model LDT, withone, two, and four outputs, arc avail-
able in 14 variations. These are trans-former low -loss ac/dc passive units,backmatched so that it is not neces-sary to terminate unused taps. Kay -Townes, Inc.
BLUE LATERAL AND 712PURITY ASSEMBLY
Registers blue, redand green CRT beams
A new single -unit, blue lateral andpurity assembly is a replacement forsimilar assemblies on any size rec-tangular color picture tube having a
triangular dot pattern. The Miller7605 assembly registers blue, red, and
green beams. An outer wheel movesopposing magnets to provide adjust-ment up to 1/2 -in. minimum for bluebeam lateral convergence. Purity cor-rection is accomplished by individualadjustment of the two purity rings. J.W. Miller Co.
SOLID -TUBE 713
Replacement for high voltagevacuum tube rectifiers
The R-3DB3 is a new solid-state"Solid -Tube" designed to replace high -voltage, vacuum -tube rectifiers in col-or -TV sets. The tube reportedly startsinstantly, runs cool and helps preventcircuit as well as socket damage. Italso makes the filament winding of thefly -back transformer unnecessary.
Maximum ratings of the R-3DB3 forpulse rectifier service are: peak inversevoltage -45,000v, peak repetitive for-ward current-110ma, average for-ward current-5ma, voltage drop @5ma-50v. Electronic Devices, Inc.
Compact for easyportability
Set Model K-600 is a 20 -piece toolset which includes major tools essen-tial for the service and repair of elec-tronic equipment. A leather zipperedcase engineered for maximum protec-tion of each tool helps ensure long-lasting performance. The case is com-pact for easy portability, is 11 -in. longand 6 -in. wide. Weight, including toolsis 2 lb. The kit includes: 1 chain nose
ELECTRONIC SERVICE TOOL SET714
. . . for more details circle 101 on Reader Service Card
72 ELECTRONIC TECHNICIAN/DEALER, MAY 1972
plier, I groovegrip plier, 1 diagonalcutting plier, 1 standard screwdriver,I Phillips screwdriver, 1 round magni-fier, 1 soldering iron, 1 bent nosetweezer, 1 straight nose tweezer, 1
solder aid, I alignment tool, 2 needlefiles. 1 contact pen -type burnisher, I
package of 12 burnisher blades, 1 pinvise, 1 solder core, 1 nut driver 3/16 -in., l nut driver 1/4 -in. and 2 miniaturescrewdrivers. Price $29.90. Jonard In-dustries Corp.
PANEL METER
Available in bothpivot and jewel band
The 2000 series panel meter lineprovides the user with a functionalstyling concept to fit any equipmentdesign. The meter line is available inboth pivot and jewel or taut band. Themechanisms have treated "Alnico 5"magnets which reportedly provide ex-cellent shielding from magnetic ef-fects. Other special features of the2000 series include a flattened scalearc and knife edge pointer for im-proved readability, wrap -around caseproviding superior protection againstdust and moisture contamination anda zero corrector accessible through thehalf bezel, eliminating the need for a
separate zero corrector hole in thepanel in bezel mounted installations.Quick cover removal combined with
easy scale change and installation per-mits the changing of user's scale platesquickly and inexpensively. On frontpanel installations, scale changes canbe accomplished without removing themeter from the panel. Weston Instru-ment.
MOUNTING PADS715 Molded from either nylon
or polypropylene
Injection molded from either ny-lon or polypropylene, the mountingpads are de-signed for tran-sistors, diodesand multi -leadintegrated cir-cuits. They arealso said to of-fer protectionfrom thermaldamage to de-vice chip or junction and provide me-chanical support, thus alleviatingproblems of dry joints caused by leadmovement during the solder freeze pe-riod. Jermyn.
716
LCORNELLJ ELECTRONICS COMPANYTHE ORIGINAL
HOME OF
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100 TURES OR MORE33CPER ruse
4213 N. UNIVERSITY AVE. SAN DIEGO CALIF. 92105Same Low Price * Bargain Tools
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COLOR CATALOG* Dumont Picture Tubes* Diodes-Transistors-Kits* Tube Cartons
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SERVICE EQUIPMENT
ECONO JIGColor Test Jig
$4 95Net Complete with less tub*
all components and cables. Durable metal cabinet. Professional equipment
for rapid servicing.
ADAPT-ALLSYoke Convergence Adaptors
lie4114v.4
To service all set,.. with any test jig.' 4 FREE: Write for cross-' ..' reference listing
thousands of sets.
TRANSVERTERSService Solid State TV
On any make test jig withsimple plug-in Transverter
MOLEX CUSTOMCABLE KIT
Make all combinationsof Molex Cables
:.',R-596 contains 41.741. Assortment of
Molex Plugs --- '
and sockets 18 wires, .,--)
contacts ....,attached.
Extractor .
4P.,/tool.
7,1 '
TELEMATIC DIV., UXL CORP.2245 PITKIN AVE., BKLYN., N.Y.11207
for more details circle 111 on Reader Service Card. for more details circle 137 on Reader Service Card
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 73
DEALER SHOWCASE
For additional information on productsdescribed in this section, circle thenumbers on Reader Service Card.Requests will be handled promptly.
SOLID-STATE INVERTER 717
For operation of 117v ac equipmentfrom 12v dc storage battery power
A new portable solid-state inverterhas reportedly been designed for theoperation of 117v, 60Hz ac equipment
from 12v dc storage battery power.This new inverter, Model I2U-S2A,has an output capacity of 275w con-tinuous and 300w intermittent whilemaintaining a stable frequency of60Hz with varying load or input volt-age. The inverter is said to be well fil-tered and comes complete with batterycables ready for operation at a usernet price of $139.50. ATR ElectronicsInc.
LOUDSPEAKER 718
Has frequency rangeof 25Hz to 20kHz
The Model 11 is a multicellularcoaxial loudspeaker featuring a highenergy 11/2 lb Syntox-6 magnet andspecial foam "Flexair" suspension.Distortion is said to be minimal due tocompression driven mid -ranges and
tweeters. The unit has a through borehorn tweeter in a 6 cell cluster, a bal-ance control on 30 -in. cable for easymounting and a black matte finish.
The speaker is said to be 12 in. in di-ameter, have a power rating of 25w, afrequency range of 25Hz to 20kHzand an impedance of 851. Shippingweight is 14 lb. Price: $69.00. JensenSound Laboratories.
8 -TRACK TAPE DECK 719
Includes a three-waytape eject system
Features of the Model TC-228 tapedeck are said to include a three-wayeject system with the capability ofautomatically ejecting the tape afterthe complete run of the tape, which inturn shuts oFF the recorder. It can beprogrammed to eject the tape aftereach run of each program, or after thetotal run of all programs, or manually,whichever the operator chooses. Ifnone of the eject buttons are de-.pressed, the tape will play continuous-ly. The eject system is also operable inthe record mode. The unit also fea-tures automatic total mechanism shutOFF. Features of the record mode in-clude manual record control and VUmeters, fast forward, pause control
with lock-which stops the tape with-out cancelling the mode of operation,program indicator lights, auxiliary in-puts, front panel microphone jacks,line outputs, stereo headphone moni-tor jack, record interlock, non -mag-netizing record head and a walnutcabinet. Price: $169.95. Sony Super -scope, Inc.
VHF/FM MARINETRANSCEIVER
Transmitter powerrated at 15 to 25w
720
The Model MT -15 is a six -channeltransmit, 12 -channel receive VHF/FM transceiver. The radio's transmit-ter power is rated at 15 to 25w.Transmitter frequency range measuresfrom 156MHz to I58MHz, whichenables the unit to deliver a 15 to 30mile signal on any 6 of the 38 marineradio service channels. Manufacturingspecifications of the MT -15 call for a0.001% accuracy for the transmittedsignal. There are 12 channels in thereceiver which enable the operator tomonitor a group of frequencies onwhich he does not normally transmit.The weather receiver crystal and
transmit and receive crystals for theemergency channel (156.8MHz) andthe intership safety channel (156.3)are factory installed and included inthe transceiver's list price. The setmeasures 21/2 -in. by 51/2 -in. by 71/2 -in.and features a vinyl clad steel cabinet
al
complete with mobile mounting brack-et, built-in, waterproof speaker andpush -to -talk mike. The built-in powersupply operates on 13.6v dc with op-tional convertor for 32 or 28v sys-tems. The front panel features controlsfor transmit or receive channel selec-tion, power, volume and receivesquelch, plus a low -power switch forin -port transmissions. Price: $259.00.Regency Electronics Inc.
STEREO HEADPHONE 721
Frequency rangeis 20Hz to 20kHz
The Model 10R201 headphoneweighs only 12 oz and has a 10 ftcurled cable. Its frequency range is20Hz to 20kHz. As an added conve-nience, it offers individual VOLUME
controls on each speaker, and a heav-ily padded headband. Suggested retailprice is under $30.00. RCA Parts andAccessories.
MINIATURE SCREWDRIVER SETTorque -amplifier handle providesbetter grip, reach and torque 722
The mini -driver set M-60 containsfive drivers for slotted head screws,with tips ranging from 0.040 -in. to0.100 -in. in width. With an overalllength of 21/4 -in., each driver has ablade length of 7/8 -in. and a handlemeasuring 3/8 -in. by 11/2 -in., plus onesize 00 Phillips type driver and a pig-gyback torque -amplifier handle which
74 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
fits over the handles of any of the sixmini-drivers-providing better grip,reach and torque. The pouch for the
set has a separate pocket for thetorque -amplifier handle, a snap -closecompartment for the drivers and mea-sures about 31/2 -in. by 31/4 -in. Handlesof all mini -drivers are of clear, dura-ble, color -coded plastic for instantidentification. Xcelite, Inc.
CABLE JUMPERS 723
Used in attaching TV setsto MATV system tap -offs
Two new 6 ft. jumper cables de-signed for use in attaching TV sets to
6 FOOT
Coloraxial Cab,,.
11111111e14111111111mimmim
MATV system tap -offs are designatedby model numbers CAD-6MF andCAD-6FF. They use tightly shieldedcoaxial cable with low loss on all UHFand VHF channels. The CAD-6MFhas an auto -type plug and an F fittingend. Both jumper cables use whitepolyvinyl -chloride insulating jacketsand both come with male fittings fac-tory assembled. The CAD-6MF listsfor $3.50 and the CAD-6FF lists for$3.15. Jerrold Electronics Corp.
TWO-WAY CB RADIO 724
Provides over 60dBsideband suppression
The Sidetalk 23 is an all solid-statetwo-way radio with the maximum al-
lowed power of 15w PEP, plus fullcontrol of the 23 upper side bands, 23lower side bands or the 23 convention-al AM channels. The transceiver hasan adjustable SQUELCH plus a FINETUNING control of each channel, sothat any off channel crystal can be ad-justed right on frequency for both re-ceive and transmit. A noise blankercircuit with front control switch isuseful when heavy city traffic createshigher than normal noise interference.Features include a crystal -lattice filterthat provides proper bandpass withover 60dB suppression of unwantedsidebands. The AM receiver sectionuses dual conversion with ceramic fil-tering for better than 70dB image re-
jection. New high-powered, RF-outputtransistors are used for both final anddriver stages according to specifica-
tions, so that reliable operation can becounted on even under the most severeoperating conditions. The unit oper-ates from 12v dc for mobile use orwith a companion regulated powersupply for 117v ac base operation.Pathcom, Inc.
New RCAModule Caddy is
a take -everywhererepair shop.
Servicing most modular RCAcolor TV chassis is a snap vrthRCA's new Module Caddy. Itssturdy Royalite plastic carryingcase, packed with 11 modules(one of each module used inRCA XL -100 solid state colorsets), plus Home Service Hand-book, lets you bring your shopright to your customer's set. You.,ust find the defective module,snap it out and snap in a re-placement from the Module
Caddy. No wasted time and ef-fort on reschedules and call-backs. Makes servicing thosenew color sets a snap. See yourRCA Parts and Accessories dis-tributor, today. Or contact RCAParts and Accessories, Dept-ford, N.J. And get your owntake -everywhere color TV repairshop . . . RCA's new ModuleCaddy is a "must" for everyprofessional TV Railtechnician.
. for more details circle 142 on Reader Service Card
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 175
Clean low voltagecontacts with
CO CONTACT
CLEANER
COCONTACTCLEANER
It removes minuteparticles by evaporatingthem away. Perfect forwatt-hour meters,recording instruments,calibration. Great forcomputer heads,precision testequipment, relays,switches. High purity Leaves no residue Degreases Penetrates Harmless to plastic No flash or fire point.
FOR NAME OF YOURNEAREST AUTHORIZEDDISTRIBUTOR WRITE
CRC ChemicalsElectrical ProductsDresher, Pa. 19025
Division of C. J. Webb, Inc.
.. for more details circle 112 on Reader Service Card
Now in amobile unit...
DRC**DUAL RECEIVE CAPABILITY
ginat
orr7,........
New Messenger 323-MHottest CB idea since 23 -channeloperation! DRC lets operator workone channel while automatically mon-itoring another. 2 monitor channelsare switch selectable. Indicator lightflashes when call is received on moni-tored channel. Mode switch selectsindicator light only or automaticswitching to monitor channel audio.Separate squelch circuits, too.
You're going to hearmore from...
JOHNSONWaseca. Minnesota 56093
. . . for more details circle 127 on Reader Service Card
ANTENNAS . . .
continued from page 47quality coax can last 10 or 20 years-longer than the antenna.
Use standoffs to keep twinleadaway from all surfaces outdoors. Use31 -in. mast clamping standoffs and31/2 -in. wood -screw standoffs if thehouse is made of wood or brick. Forhouses with aluminum siding, 7 -in.standoffs are recommended to keepthe twinlead away from the metal.Also use 7 -in. standoffs to keeptwinlead away from metal guttersand drain pipes.
Indoors, you really should usestandoffs, too, but they are just toougly to be practical. Therefore, in -
TESTEQUIPMENT
atDiscount
PricesArifNC CDI=t
Equipment by OtherManufacturers also Available
Catalog & Priceson Request
FORDHAM Radio Supply Co., Inc..1104%, 265 E. 149 Street, Bronx, N.Y. 10451\'' Tel: (212) 585-0330 RCA
DISTRIBUTORS OF ELECTRONIC SUPPLIES
. for more details circle 121 on Reader Service Card
. .
Technicians, Earn Your Associate
DEGREEmostly by correspondence
Accredited by the Accdt. Comm. of Nation..1 limn(Study 0,1111(.11 f; I frill Approked Fo, , .f.,1t.gWr''' Dept. T
Grantham School of Engineering1505 N. Western, Hollywood, Calif. 90027
. for more details circle 123 on Reader Service Card
FREE ALARM CATA nck744 PAGES FILLED WITH 350 BURGLARAND FIRE ALARM PRODUCTS FOR :I AND ELECTRONICTECHNICIANS. INCLUDES RADAR. -.......,INFRARED, CONTROLS. HARD -TO -FIND PARTS, AND S PAGES OFAPPLICATION NOTES.
, a1mountain' west alarm --- -;% 4215 n. 16th st., phoenix, az. 85016
stallers generally staple the twinleadalong the baseboards. Use as fewstaples as possible, try to hide thetwinlead in closets and under rugs,and be sure that staples do not con-tact the conductors inside the twin -lead.
If you are using coaxial cable,fewer restrictions apply. You cantape coaxial cable directly to themast and staple it to the roof (usea staple gun with rounded crownstaples for speed). Staples should beinserted with enough depth to holdthe coax securely in place. (Fig. 5shows a typical coax installation.)
You can run coax anywhere,alongside wires, inside pipes, next tometal-anywhere. There are onlythree cautions: Do not crush coax. This causes amismatch, resulting in signal atten-uation and smears. Do not bend coax too sharply orit will collapse, causing the sametypes of problems as crushed coax. Terminate coaxial cable careful-ly. One loose strand in a connectorcan cause a short, ruining reception.
Whichever lead-in wire you use,fasten it securely to the antenna.Use spade lugs to attach twinlead tothe antenna terminals. Tighten theterminals firmly and then spray withacrylic for weatherproofing. Be sureto take the twinlead through theantenna strain relief so that there isno pull on the antenna connection.
Coaxial cable requires a match-ing transformer. The matching trans-former generally slips right onto theantenna. Protect the connection withacrylic spray.
Before fastening the coax to thematching transformer, coat both themale and female connectors withsilicon grease. Then, use a weather -boot to keep moisture out. Thismakes a very solid, secure connec-tion, which you should point to withpride when you show the completedinstallation to your customer.
If the installation includes a rotor,be sure to leave enough slack in thedownlead to permit a full 360° turnof the rotor.
GroundingEvery antenna installation must
be grounded. According to the Na-tional Electrical Code, you musttake the mast and the mount directlyto ground with no splices or connec-
continued on page 78... for more details circle 132 on Reader Service Card
76 I ELECTRONIC TECHNICIAN/DEALER, MAY 1912
TEKLABcontinued from page 41
Chroma CircuitsThe chroma circuits are con-
tained on the PW700 chroma board.This board should help to reduceyour tube inventory because alltubes employed on the board aretype 6GH8's. There are also threetransistors employed-one in eachof the following circuits: ACC am-plifier, color killer, and tint modula-tor circuits. The RED, GREEN andBLUE SCREEN, COLOR KILLER andPICTURE TUBE BIAS controls are alsomounted on this board.
Deflection CircuitsThe PW500 deflection board con-
tains the vertical oscillator and out-put, transistorized sync separator,horizontal oscillator and reactancecircuits. The HORIZONTAL HOLD,VERTICAL LINEARITY and HEIGHTcontrols are also mounted on thisboard.
High -Voltage System
The high -voltage circuits are con-tained on board PW900, which in-cludes the focus board, P159. Withthe exception of the high -voltagemultiplier, which is bolted to themain chassis and connected withpush -on connectors, the completecircuit can be pulled for service.This chassis uses a fifth harmonichorizontal output circuit and a solid-state -high -voltage rectifier.
The relatively low impedance ofthe high -voltage circuitry eliminatesthe need for a regulator tube-it be-ing controlled with the use of varis-tor feedback. This system reportedlyhas high reliability without X-radia-tion and stabilizes the high voltageat greater brightness levels and witha lower beam current than third har-monic systems.
The high -voltage rectifier used inthis chassis is of solid-state design,incorporating a multiplier circuitconfiguration. Pulses from the hor-izontal output transformer (approx-imately 8.33kv) are coupled to themultiplier unit. These pulses causethe capacitors within the unit tocharge in such a manner that theirvoltage become "stacked" to pro-vide the tripling action, producingthe required 25kv. Essentially, thetripling action requires four or fivepulses to be completed.
Wading through reams of manufac-turers' references is the hard wayto find transistor replacements. Weknow, because we checked over40,000 types to find the "FunctionalFifty" that cover 99% of your func-tional needs.
Now we've put them on our newTransistor Application Slide -Rule sothat you can locate a replacementevery time - in seconds. All you haveto know is the transistor's function andpolarity.
You'll spend more time on profitableservicing, less time tracking down re-
placement numbers, special sourcesand waiting for deliveries.
You'll save money, too. You stockfewer types to do more jobs. Andwhen you buy ten IR premium qualitytransistors, you get 20% off net, notthe usJal 10% other brands allow.
GET YOUR FREE IR SLIDE RULE,plus our current "SemiconductorCross Reference and Transistor DataBook", by redeeming the coupon be-low at your nearest IR distributor.Switch to the "Functional Fifty". Giveyourself more room for profits to grow.
Can't find the righttransistor in
your references?
...try IR's ApplicationSlide -Rule, Free!
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I NTE Ft N ATI co NAL Ft ECTI FIE Ft IORSemiconductor Div.: 233 Kansas St., El Segundo, California 90245 (2 3) 678-6281
. for more details circle 126 on Reader Service Card
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 77
`No-Noise'ProductsWork Likeitlanie!
For Color" Or° v.and B/W 44 SUPER- LUBE
Concentrated formulafor heavy duty jobs.Foams away corrosion,dirt. oxidation andpolishes all tuners with-out drift or detuning.Avoid call-backs.
"No -Noise"products are
guaranteed non-flammable.no carbon
let, non-toxic, safe
for plastics.
suraiwir
VolumeControl &Contact NOM.'
Restorer liumECONTROL
Cleans, lubricates. re- 1"0:30..stores volume controls. CONTACTpush button assemblies, RESTORER
band switches, relays '1"e02081. Ip. and other electri-Alii,cal contacts.
Manufacturers of These OtherFamous "NO -NOISE- Products:
Tuner -Tonic EC -44 Super Spray BathFrigid -Air Tape-Reco Head Cleaner
Often imitated but never duplicatedELECTRONIC CHEMICAL CORP.813 Communipaw Avenue Jersey City, N. J 07304
. . for more details circle 117 on Reader Service Card
ANTENNAS._continued from page 76
tions along the way. Also, groundwires must be heavy copper, alumi-num or copper clad steel. Generallyspeaking, aluminum is favored bymost installers because it is light, in-expensive, corrosion resistant andeasy to handle.
You can use either a cold waterpipe (hot water pipes will not do)or a ground rod as a ground elec-trode. In practice, installers almostalways use ground rods, whichshould be driven at least 3 ft intothe ground.
If you are using coaxial cable, allyou really have to do is connect themast to the ground rod. If it is atwinlead installation, you shouldalso ground the twinlead, using alightning arrestor, as shown in Fig.2, 3 and 4.
If you plan ahead and work in-telligently, you can make excellentinstallations in a remarkably shorttime. Invest in good tools and goodmaterials and you will soon estab-lish a reputation as the antenna ex-pert in your area.
rNEW ENDECO
Desolderi ngKits
All you need to handlealmost any desolderingand resoldering job!
MODEL
300K
KIT
SHOWN
Kit 300K includes the famous Endecopencil desoldering iron Model 300, sixdifferent size tips (.038 to .090) for anyjob, tip cleaning tool, and metal standfor iron ... all in a handy lifetime steelstorage box. S19.90 net. Model 300K-3with a 3 -wire cord $20.90. Also a similarkit for military users. Kit 100K with largeEndeco iron (Model 100A) is $27.40, and3 -wire Kit 100AD-3 $28.40.
SEE YOUR DISTRIBUTOR OR WRITE
ENDECO
ENTERPRISEDEVELOPMENTCORPORATION
5127 East 65th St., Indianapolis, Ind. 46320... for more details circle 119 on Reader Service Card
PARTNERcontinued from page 57
in our industry before we sign thepartnership papers.
Such a check-up can often revealinformation concerning an individ-ual about which we were not evenaware at the time-information thatcan be of such a nature as to pre-clude the advisability of taking thisman under consideration as a part-ner. It is far better to discover thesethings before the papers are signedthan afterwards.
His past reputation in the communityshould be investigated very thor-oughly for we must bear in mindthat the reputation of our firm willbe no better than that of this partnerin the future. A man who is knownfor sharp practices, cutting corners,underhanded techniques, etc., car-ries that reputation with him evenwhen he enters into partnership witha businessman who is the direct op-posite. And he drags down the goodbusiness reputation of his partner nomatter how forceful an individualthe latter may be.
The fine reputation that we buildup over many years will mean littleto our customers if we enter into a
partnership with a man devoid ofsuch a reputation. Our customersimmediately assume that they havebeen wrong about us and that wewere that type of businessman allalong or have decided to becomeone, otherwise we would have neverentered into partnership with suchan individual.
Each of the foregoing factorsshould be checked as carefully asthe business ability of the man thatwe are considering as a businesspartner. They can make or breakthat partnership and do so before wewill be able to realize what is hap-pening.
LETTERS...continued from page 26
1X2B, and 6BK4C for 6BK4. Themanufacturer's tube fact sheet or re-ceiver tube replacement manual mayprovide this information for the tech-nician.
Technicians should also be carefulto replace the picture tubes, when nec-essary, with tubes having radiation rat-ings equal or better than the originalpicture tube.
The high -voltage metal shieldingshould always be secured properly af-ter servicing the high -voltage section.
We believe these suggestions will al-low a technician to properly assureminimal x-radiation emission fromolder receivers.
ROBERT L. ELDER, Sc.DFOR DIRECTOR
DIVISION OF ELECTRONIC PRODUCTS
BUREAU OF RADIOLOGICAL HEALTH
0\-IV SfKVitE)
SERV/CCM/4MVVANTE-p
"I hear you need a good servicemanI've been in the service 14 years."
78 I ELECTRONIC TECHNICIAN/DEALER, MAY 1972
TECHNICALLITERATURE
Cross -Reference and TransistorData Book
The Semiconductor Cross Referenceand Transistor Data Book is a 64 -pagevolume which has been revised andlists information on diodes, zeners, ca-pacitors, rectifiers and SCRs. It in-cludes more than 4000 new transistorlistings. Complete specifications, elec-trical characteristics and outline draw-ings are given for the line of siliconand germanium transistors. An appli-cations -oriented table permits the userto locate the description which fits hisrequirements, and determine the prop-er transistor. A removable wall chartlists products by applications, includingAF stages. RF stages. TV deflection
1972 New Orleansconvention theme
Come join us for four great conven-tions at the Jung Hotel in NewOrleans, La. on August 9.13, 1972.Contact Nolar Boone, 5522 West12th, Little Rock, Ark. 72204 (501-666.1686) concerning the NationalAlliance of Television ServiceAssociations; Roger Drost, 502 PecanSt., Sulphur, La. 70663 (318.527-9041) concerning the ElectronicTechnicians Association ofLousiana; and Dick Glass, 1309West Market, Indianapolis, Ind.46222 (317.632-2469) concerningboth the National ElectronicAssociations and the InternationalSociety of Certified ElectronicTechnicians. Besides these con-ventions, there is the ElectronicIndustry Council, the NationalService Conference, service trainingseminars, and business courses.
stages, and three other categories. Eachmajor heading is divided into sub-headings to facilitate use. Semicon-ductor Div., International RectifierCorp.: 233 Kansas St., El Segundo,Calif. 90245.
Coil Cross -Reference DirectoryReplacement Guide No. 172 is a
comprehensive and authoritative coilreplacement guide for all known do-mestic and foreign color- and B/W -TVsets, home and car radios. Over 22,000replacement coils for 327 manufac-turers names are listed. J. W. MillerCo., 19070 S. Reyes Ave., Compton,Calif. 90221.
Tape Editing BookletA new 24 -page booklet, entitled
Tape Editing, covers such topics as thelatest tape splicing materials, where tocut the tape, establishing a tape -mark-ing point, sound recognition, cuttingwithin sound, the Editall tape repairand splicing system and other areasinvolved in the techniques of tape edit-ing. Price is $1.00 per copy. ElpaMarketing Industries, Inc., New HydePark, New York, N.Y. 11040.
Electronic Chemicals CatalogProducts described in this catalog of
Electronic Chemicals include: tunersprays, circuit coolers, insulatingsprays, contact and control sprays,lubricants, tape head and record clean-ers/accessories, cartridge tape headcleaners and conditioners, electronicglues and cements, solder and spraypaints. This I2 -page catalog has com-plete descriptions, general and unusualapplications, illustrations, tables andpricing for all products. Chemtronics,Inc., 1260 Ralph Ave., Brooklyn, N.Y.11236.
Digital V -O -M Bulletin
A 2 -page, 2 -color data sheet de-scribes a small, lightweight portable23,i digital V -O -M, Model 6028.which is said to feature 100% over -range, out -of -range and reverse po-larity indications. The sheet gives thecomplete dc volts, ac volts, resistancedc current, and ac current ranges.and indicates price and accessoriesavailable. Triplett Corp., MarketingDept., Bluffton, Ohio, 45817.
NE
FOR
THE
MONEY Discounted to provide you with ahigher profit margin.
Proven quality for better customersatisfaction.
A complete range of service typesfor radio, TV, hi-fi, foreign andindustrial electronics.
In every important way, InternationalServicemaster is number one.For complete details, contact yourInternational representative today,or International Electronics SalesCorporation, 10 Daniel Street,Farmingdale. New York 11735,(516) 293-1500.
InternationalInternational Electronics Sales Corp.div.of International ComponentsCorp.
. for more details circle 125 on Reader Service Card
MAY 1972, ELECTRONIC TECHNICIAN/DEALER 79
0
0
FOR TIGHT
SPOTS!
18.
WorkingArc
POSTPAID
Midget RATCHET SETplus ADAPTERS
Seventeen different interchangeable adapt.ers with a screwdriver attachment andextension, plus the world's mightiestMIDGET RATCHET in a compact 4" x 6"steel case. The strength of this twentytooth stainless steel ratchet far exceedstorque standards set by military specifi-cations. Requiring only an 18° workingarc. reverse action is obtained by simplyturning the ratchet over. Kit includes 12Allen Hex Adapters from .050" to 3fr,",2 popular Philips sizes (#1 and #2), 2Slotted Head sizes (%" and 3/8"), plus a1.," Square Drive for use with standardsockets.
Only $12.95Send Check\ or Money Order
POCKET SIZENO. 6320 KIT
Send Check THE CHAPMAN MANUFACTURING COMPANYOr Money Order to ... DURHAM, CONNECTICUT 06422 Dept. ETDS
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COMMERCIAL AUDIO...continued front page 54
When working with these arrangements, you may findit more convenient to "see" the groups as symmetricalequivalent circuits. They may look less confusing. Asshown in Fig. 15, there are 14 speakers represented intwo groups: six 1611 and eight 811 speakers. The totalimpedance comes out to exactly 9.611. Each speaker inthe 1611 group can run at 4w-a total of 24w. And eachspeaker in the 811 group can run at 4.5w-a total of36w. Hence, a 60w amplifier would be in order.
It is possible to work out almost any speaker com-bination to match a transformerless amplifier's outputimpedance and fit a desired installation-except possi-bly where a very large number of speakers running atdifferent wattage levels are employed (usually beyonda total of 18 or 20 speakers). Once again, the manufac-turer of high -quality audio products can and is usuallyglad to help you. Available literature has various speak-er combinations worked out in advance. Chances arc,you will find onethat fits the installation you have inmind-with only slight variations necessary.
MOVING?Be sure to let us know your new address.Please enclose a complete address labelfrom one of your recent issues.
READERS SERVICE INDEX
ADVERTISER'S INDEX101 Advanced Applied Electronics Co. 72102 Amperex Electronic Corp. ... 31103 B&K Div., Dynascan Corp. .. 48104 Blonder -Tongue Laboratories, Inc. 35-38105 Book Club-Schematics . 69106 Book Club-Tab Books . 62-65141 Castle TV Tuner Service 30107 Centralab Distributor Products 24108 Chapman Manufacturing 80109 Chemtronics, Inc. 56110 Cooper Industries, Inc.
Weller Division 22111 Cornell Electronics Company 73112 CRC -Electrical Products 76113 Delta-Benco, Ltd. 43114 Delta Products, Inc. 26115 Dictaphone 30116 Eico Electronic Instruments 68117 Electronic Chemical Corporation 78118 Elpa Marketing Industries, Inc. 28119 Enterprise Development Corp. 78120 Finney Co., The 58121 Fordham Radio Supply Co., Inc. 76122 Ford Marketing Corporation 42
General Electric CompanyTube Products Division 49
123 Grantham School of Engineering 76GTE Sylvania, Electronic Components 29, 55
124 Heath Company, The 67125 International Components Corp. 79126 International Rectifier Corp.
CPD Division 77127 E. F. Johnson Company 76128 Leader Instruments Corporation 3rd Cover129 LPS Research Labs 68130 Mallory Distributor Products Co. 21131 J. W. Miller Company 71132 Mountain West Alarm Supply Co. 76133 Precision Tuner Service 19134 Raytheon Company 32
RCA Consumer Electronics 59142 RCA Parts & Accessories . 75
RCA Picture Tubes 4th CoverRCA Semiconductor Distributor Products 27
143 RCA Test Equipment 33135 RMS Electronics, Inc. 71136 Sprague Products Company 25137 Telematic Div., UXL Corporation 73138 Triplett Corporation 2nd Cover139 Workman Electronic Products, Inc. 72140 Xcelite, Inc. 70
Zenith Radio Corporation 61
NEW PRODUCTS700 Amplifiers 34701 Wireless Microphone 34702 Home Burglar Alarm Kit 34703 Plug -In Bridge Rectifier 70704 Dual Trace Scope 70705 Plug -In Fuseholder 70706 Switches and Relays 70707 Trans-Verter 71708 Coaxial -Cable Stripper 71709 Mixer/Power Amplifier 71710 Cleaner 72711 Line Drop Taps 72712 Blue Lateral and Purity Assembly 72713 Solid -Tube 72714 Electronic Service Tool Set 72715 Panel Meter 73716 Mounting Pads 73717 Solid -State Inverter 74718 Loudspeaker 74719 8 -Track Tape Deck 74720 VHF/FM Marine Transceiver 74721 Stereo Headphone 74722 Miniature Screwdriver Set 74723 Cable Jumpers 75724 Two -Way CB Radio 75
TEST INSTRUMENT900 B & K's Model 1465 Triggered -Sweep Scope with Cali -Brain 60
80 ELECTRONIC TECHNICIAN/DEALER, MAY 1972
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Now Just 3 RCA Hi-Lite"V"Type Color
Picture Tubes Replace 185 Types
Replaces 9819" types
Replaces 2221" types
Replaces 7525" types
18VABP22 19HCP22/ 490ASB22 19VABP22 21FJP22A/ 23EGP22 25ABP22 25BP22A/18VACP22 19HKP22 490ASB22A 19VACP22 21GVP22 23EGP22A 25ADP22 25YP2218VADP22 19HFP22 490BAB22 21AXP22 21FKP22 23VABP22 25AEP22 25BRP2218VAHP22 19HJP22 490BCB22 21AXP22A 21GUP22 23VACP22 25AFP22 25BSP2218VAJP22 19HKP22 490BDB22 21AXP22A/ 21GUP22/ 23VADP22 25AGP22 25BVP2218VAQP22 19HQP22 490BGB22 21AXP22 21FBP22A 23VAHP22 25AJP22 25BWP2218VARP22 19HRP22 490BHB22 21CYP22 21GVP22 23VALP22 25ANP22 25BXP2218VASP22 19HXP22 490BRB22 21CYP22A 21GVP22/ 23VAMP22 25AP22 25BZP2218VATP22 19JBP22 490CAB22 21FBP22 21FJP22A 23VANP22 25AP22A 25CBP2218VBAP22 19JDP22 490CB22 21FBP22A 21GXP22 23VAQP22 25AP22A/ 25CP2218VBCP22 19JHP22 490CHB22 21FBP22A/ 21GYP22 23VABP22 25XP22 25CP22A18VBHP22 19JKP22 490CUB22 21GUP22 21GZP22 23VASP22 25AQP22 25FP2219EXP22 19JNP22 490DB22 21FJP22 21HAP22 23VATP22 25ASP22 25FP22A19EXP22/ 19JQP22 490DB22A 21FJP22A 23VAUP22 25AWP22 25GP22
19GVP22 19JYP22 490EB22 23VAWP22 25AXP22 25GP22A19EYP22 19JZP22 490EB22A 23VAXP22 25AZP22 25RP2219EYP22/ 19KEP22 490FB22 23VAYP22 25BAP22 25SP22
19GWP22 19KFP22 490GB22 23VAZP22 25BCP22 25VP2219FMP22 490AB22 490HB22 23VBAP22 25BDP22 25WP2219FXP22 490ACB22 490JB22 23VBCP22 25BFP22 25XP2219GLP22 490ADB22 490JB22A 23VBDP22 25BGP22 25XP22/19GSP22 490AEB22 490KB22 23VBEP22 25BHP22 25AP22A19GVP22 490AFB22 490KB22A 23VBGP22 25BJP22 25YP2219GVP22/ 490AGB22 490LB22 23VBHP22 25BMP22 25YP22/19EXP22 490AHB22 490MB22 23VBJP22 25BP22 25BP22A
19GWP22 490AHB22A 490NB22 23VBRP22 25BP22A 25ZP2219GWP22/ 490AJB22 490RB22 23VBTP2219EYP22 490AJB22A 490SB22
19GXP22 490AKB22 490TB2219GYP22 490AKP22A 490UB2219GZP22 490ALB22 490VB2219HBP22 490AMB22 490WB2219HCP22 490AMB22A 490XB22
490ANB22 490Y B22 Stock these three RCA Hi-Lite color picture tubes and have im-490ARB22 490ZB22 mediate replacements for the fastest moving industry types -195 of them.
It's the way to save yourself time, give your customers faster service,improve profits.
RCA Hi-Lite types are all new, made to OEM specifications andcontain the newest RCA manufacturing technology, including Perma-Chrome and the latest X-ray attenuating glass.
Order these three RCA Hi-Lite tubes, and other types you mayneed, from your RCA Distributor. He also has the complete RCA Inter-changeability Guide, available free of charge.
RCAIElectronic ComponentslHarrison, N.J. 07029
IILCIElectronicP Components
