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C-2, 5, 7 1611 C-3, 4, 6 2597 C-8, 11 572 C -9a, b. 5377 C-10 2780 C-12 580 C-13 C-14 4810 C-15 2560

C-16 2741 C-17 3871 C-18 568 C-19, 20 C-21 581 C-22, 23 2600

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Description 5397 5353 5357 5388 3904 5234 5233 5240 5232

R-3 2605 200 ohm /W.10% R-4. 5 624 1 Meg. W. R-6 598 200M 'A W. R-7 5332 500M Volume

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3463-10 1st IF Transformer 3463-4 2nd IF Transformer 5096 Oscillator Coil 5392 Antenna Coil 5390 Band Switch 5394 Tone Control Switch 5390 Band Switch 5394 Töne Control Switch 5422 AC -DC Switch

Button escutcheon Tuning Buttons Call Letter Sheets Speaker Knobs Phono Pick Up Turn Table Radio -Phono Switch Phono Motor

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ALINEMENT PROCEDURE MODELS 3,251,256. Connect a high impedance AC voltmeter across loud -speaker terminals. Volume

control should be set a few. degrees back of maximum volume position. Use a weak signal from generator, strong signals tend to cause improper adjustments.

I.F.: Connect the generator ground to receiver chassis. Using .1 mfd. condenser in series with high side of generator, apply 456 kc. signal to grid of 6D6 I.F. amplifier tube, and aline transformer No. 2. Connect generator to grid of 6A7 tube and aline transformer No. 1.

RF. (See above diagram for location of trimmers.)

Using a 200 MMF. condenser in series with the high side of the generator, turn band selector switch to left hand position and the tuning condenser to about 600 kc. Feed a 456 kc. signal to the antenna and adjust wave trap trimmer for minimum response. With the tuning condenser at minimum'capacity feed 1660 kc. signal to the antenna and adjust broadcast oscillator trimmer for top frequency. Set generator frequency at about 1400 kc. Adjust broadcast antenna trimmer. Set generator for 600 kc. tune receiver to signal and adjust the padder. The tuning condenser should be rocked back and forth through the signal while varying the padder in order to assure perfect alinement.

Using 400 ohm resistor in series with generator, set band selector in center position. set generator to 5400 kc and adjust oscillator trimmer for top frenquency. Set generator to .5000 kc, tunereceiver to signal and adjust antenna trimmer.

Turn band selector to extreme clockwise position. Using 400 ohm resistor in series with generator, set oscillator top frequency for 16.500 kc-screw trimmer down tight, then unscrew to second peak. Set generator to 15,000 kc, tune receiver to signal and adjust antenna trimmer-Screw trimmer down tight, then unscrew to first peak, rocking the tuning condenser back and forththrough the signal while the adjustment is being made. Above procedure for alinement at 15,000 kc must be followed exactly to insure proper tracking. A dead spot,at about 12,000 kc will result if antenna and oscillator circuits are not set in proper relation to each other.

Adjustment of Mechanical Automatic Tuning System Any of your favorite stations may be set up on any button, but it is recommended

that they be set up in the same sequence as they are received on the dial. Loosen one of the buttons by turning it to the LEFT. A slot is provided in the button into which .a coin may be inserted to facilitate turning. After turning the button a few turns to the LEFT, press it in as far as it will go-. While holding the button in this position, tune in the station desired very carefully in the usual manner with the, manual tuning knob. While still holding the button if, fix the adjustment by turning the button to the RIGHT until tight. Thereafter the station set up on this button will be received whenever this button is pressed in AS FAR AS IT WILL GO.

©John F. Rider, Publisher


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Symbol Part No. Description 5394 Tone Control Switch 5422 AC -DC Switch

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1)I:'l'KOI.A P,-1GN. 10-7

nN:TIt0i.1-1 CORP. TtDEL 267 Schematic ,Socket Tr inuners ,A 1 i gnment

5 -TUBE STORAGE BATTERY POWERED SUPERHETERODYNE

WARNING! DO NOT CONNECT A CHARGER TO THE BATTERY WHILE THE SET IS IN USE. DO NOT GROUND EITHER SIDE OF THE BATTERY.

cI

6 16

r

T , C. cis

M

T

6íV5

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Is es

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5685

Symbol

T

Part No.

I.F . 4c5 K.0

Description

CI 1611 3-35 mmf Trimmer C2. 7. 9 2597 1-10 mmf Trimmer C3, 14 572 .1-200 v.

C4. 5 5724 350 mmf Variable C6 2780 50 mmf Mica CS 2740 3850 mmf padder CIO 2560 350 mmf padder C11 565 .01-200 v.

C12 1285 100 mmf Mica C13, 15 I. F. Trimmers C16 4810 .0005-400 v. C17, 20 5273 16mf 150 v. C18, 19, 22 576 .02-400 v. C21 3003 .5-160 v. C23 5684 .03-1000 v. C24 580 .05-200 v.

C25 3190 1000 mmf Mica C26 4171 .2-160 v.

RI, 2 631 50 M 1/3 W

4

RF (Kelm

c22 if

6ZY5G

1 '

S.F. Cholet

0082

4

:o Cil

Cr4

Symbol Part No.

R3 R4. 5

609 624

R6 5690 control

R7, 8 630 R9. 13 603 R 1 0 615 R11 4474 R12 2881 R14 4475

3412 4457 5682 5333 5679 5678 5766 5680 4463

Description

15 M 1/3 W 1 Meg 1 /3 W 500 M Volume and switch 2 Meg 1 /3 W 100 M 1/3 W 500 M 1/3 W 35 ohm 1 W 400 ohm .1/3 W 200 ohm center tapped No. 1 IF Transformer No. 2 IF Transformer Power transformer Band switch Antenna Coil Oscillator Coil Vibrator Battery cable 6" Speaker

c

ALINEMENT PROCEDURE Connect a high impedance AC voltmeter across loud -speaker terminals. Volume

control should be set a few degrees back of maximum volume position. Use a weak signal from generator, strong signals tend to cause improper adjustments.

IF. Connect generator ground to receiver ground. Using .1 mfd condenser in series with "high" side of generator, apply 456 kc signal to g.id of 6S7G and adjust second IF transformer; same for first IF, applying signal to grid of 6D8G. (See above diagram for location of tubes and transformers.)

RF. (See circuit diagram for location of trimmers.) Using 200 mmf condenser in series with generator, feed 1725 kc signal to antenna lead and adjust oscillator top frequency. Set generator at 1400 kc. tune receiver to signal and adjust broadcast, antenna trimmer. Set generator to 600 kc. tune receiver and adjust padder. The tuning condenser should be rocked back and forth through the signal while the padder is being adjusted in order to obtain perfect alinement.

Using 400 ohm resistor in series with generator, set band selector in short wave (right) position, feed 15,600 kc signal to antenna and adjust oscillator trimmer-screw trimmer down tight and unscrew to SECOND peak. Set generator to 15,000 kc, tune receiver and adjust antenna trimmer-screw trimmer down tight and unscrew. to FIRST peak, rocking the condenser back and forth through the signal while the adjustment is being made. Above procedure for alinement at 15,000 kc must be followed exactly to insure proper tracking. A 'dead spot" at about 12,400 kc will result if antee su and oscillator are not set in proper relation to each other.

0

f

g 101

e 0 IMO

0 -ö

C

0q 0

MODEL

267

540 KC and 1725 KC 5.5 to 15.5 megacycles

á o

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C

o

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E o

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o

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PAGE 10-8 DETROLA

MODEL 270 !MEW 282,288 I,12DEL 286

ii a,

a

I

})})

L 1! SL

u

4000

Y0 re .1-, a,

a o 4 4

o

I)I+,'I'ROLA CORP.

4_ 4_ ' W

.

a di

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'INS INS ICS

6259 c wsin C.. nnwl

MODEL 282 4 TUBE POR 7ABL E

w.i..,..4 u..

0 d

2 ti

ñ

Ó QV

ro, 6000

i..i. re..... .

BATTERY INSTALLATION Remove the batteries from the shipping carton,

save the small piece of cardboard packing. Place the "B" pack in the cabinet as shown in the

j illustration. Then put in the "A" pack. Take the small piece of cardboard packing and fold to a size that will wedge the "A" pack between the shelf and bottom of case. (See illustration.) The packing is used to prevent the "A" pack

1. from bein oose i case. -

tfl .444.!

0.

z

r

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CO QJ

CO; N u

_o

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o b ov XN

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Ccnnect the "A" and "B" plugs as Shown in the illustration. It makes no difference which socket on the "B" pack. the three prong "B" p1uu3 are inserted. Ú c: ç ai V C v 2

ei ó e:

J SE«°a,,ñr°1,1É ge"w03

2g. LÁ ÿE `' >2-3» t0 7-

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DETROLA PAGE 10-9

Schematic s,Socket Trimmers ,Alignment I)}+.'l'HO1,r1 CORP.

z 6040-A l.c.

D -C -

/2ABET

.OS

o '001'

/270F

Model 274 /2K76T /1Q76T 33-L667-

02 a-

[JM

/03-125" 4,-oz 446

AC.

T

2071F

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,aBGr i

57407 /2 T /2076r

12A8GT 12K7GT

1 P 0006 II -0

/202

/.F 4551fC

PART NO 6744

/25761

Translator IF Amplifier

l¿K7GT -1_

3Sz4cr 55[sc1 uAacr /z07cr

L5761

12A8GT Translator 12K7GT IF Amplifier 12Q7GT Detector AVC

/2 A(767 -

J0

r:

/2NFIJ

os

/2K76T 1

+/I 5746 f ,J

1

r

-1 QºQQ.Q 7-

MODEL 274 MODEL 276U,Super Pee Wee

MODEL 2742

(j jjjjAAr/GW ON-A''F sWi rcN r' I S!'L£CTOR YOL!/M6 CONTRLO l I

u

LOOP

POWER CORD TERMINAL /OR SNORT ANTENNA

PART NO 6147

35L6GT Output 35Z4GT Rectifier

CONVENTIONAL ALIGNMENT

Super Pee -Wee Model 276-U SEE SPECIAL SECTION VOLUME V111

12Q7GT Detector AVC

12 07C o, jS 6T i

35L6GT Output 35Z4GT Rectifier

ANTENNA LEAD

oN- oFF Sw/rCNS v. L UNE Con.? '/.

STAT/ON SELECTO/7

MODEL 2742-A.C: D.C.-PUONOGRAPH

/2076T 35,66T 02 1

H M

,za

JSl{K /1.196r /f076

j ,..1 F

i Jn

4SS 5C

I N' <RrsrSl

nicrcu

QO(7QQr-

PART 6383

STAT/LW ON -4-f W/TGN SELECTOR d VOLME CONTROL

4AG JT

n

f'OYi'ER oRO

Jr 455 A®

2 /K7tiT,

35L 60r

LOOP

POvvtR GORD TEAM/MAI. FOR JNORT AN 1 -NA

PART NO 6/47 For phonograph operation turn the Radio Phono switch to the

Phono position. THE A.C.-D.C. SWITCH MUST BE SET IN THE This receiver is designed to operate on 105 to 125 volts, 60 cyele. PROPER POSITION. (This switch is on the phonograph panel.) The

alternating or direct current. Do not connect to any other source. radio volume control also serves as the phonograph volume control.

Jitar /25707'



PAGE 10-10 llETHOLA MDDEL 280,Jr.PeeZYee rdDDEL 283 r.íDDEL 284,Super Pee -Wee IAODEL 2741

MODEL 283 nn ,rArmw ¡¡¡ on-CKF SW/TCM 1 IJELCOTOR I I6VOLUME' CONTROL

POWER CORO LOOP PART"' 6327 DO NOT CONNECT A GROUND TO THIS RECEIVER. 35246T 3.2.467 /2A&ó7

6,97 606 6076 25L66 RKXT /637&r 1 l _Cr

9... C=514

' oil .

I¡ ON-OFF JW/T<NBVOC U,

Há Mo d

9 ó .'FíSSMC PRRT 6322 H H .-1 H

Part No, 6337 4 U This receiver is designed to operate on 105 to 125 volts, direct

64 GO or alternating current.

4 TUBE LOCATION CHART-MODEL ó a H i-1

l'il ON -Off SW/7YH3Y0LUMECr'NrRnt H rU

N. W , STAT/ON SELEC7O:t M

Ci) 3 ,..i ' W u,

804986 20ZJ s 6076

Ó no

o SCHEMATIC DIAGRAhí-MODEL 28C

Ñ CYFAHP OEGT p7sriT

a v ,2K7cr /zFscT 3SLccT A

O Q , 1 T 1 I °¡w

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E-1

Schematics,Socket Trimmers Alignment

MODEL 2741 PHONOGRAPH )TAT /ON ON -CFF .SW/TCN JEL£C TOR á VOLVNIZ CONTROL n

PART NO 6/47

PART 6-383



DN.IVAI.D PAGN, 10-1

Dr:«'ALll RADIO MFG. CORP.

This is a battery operated surerheterodyne receiver with full automatic

volume control. A self-contained loop in incorporated mhich makes the

use of an ortenna unnecessary. It is designed to function with an "A"

supply of 1.5 volts and a "B' supply of 90 volts. The broadcast range

coverage is 540-1600 kilocycles.

lf7G

3

lNS6

3Me9

J

/00 MMFD

100 MMFD

MODELS 406R,412 MODEL 406R Schematics

11155 íC36

00/

fo all A

I2K7GT -- 00, MFD

105 -125 V

AC - DC

25-60-

MODEL406R-4I2 When used ns LW mode( see 'A 6'

45

eMFD

IF PE4K 455 KC

hodeCf08R

I2F5GT 50L6GT 005 tiro

Sc?

365 MNFD D T11, I "`9

011410

ISOQ TzFD

PM Dynamic

12 f.561 12K76T 50166T

17 02 MFD

95ZSGT 570052

©John F. Rider, Publisher www.americanradiohistory.com

PAGE 10-2 DEWALD

ÌJDEL A Fhono.Converter DDDDEL 411 Phonosoope DEWALD RADIO MFG. CORP. Sohelt.tic Data

250 MMFD

iRF

10M S MMFD

_ 1268GT Áudv heg

1.01 MC

JON

SONIC

ó

32L7GT

57

,ö 16 = lees MME

Crystal,

Pickup

Phono Motor

100 MnFD

1

to 105-125V, AC 60- unless otherhue sheaf ter(

The "PH0:0SCOPd" is a combination audio and wireless playback. Disc recordings

may be played directly through this unit, or may be reproduced through a remote radio receiver. A microphone may also be used instead of disc recordings. The

unit has been designed to operate on 105-125 volts 60 cycles A.C. unless otherwise specified.

PHONOGRAPH The phonograph motor and unit is turned "on" by rotating the knob OPERATION on the right in a clockwise direction. Further rotation in this

direction increases the volume. Turn the knob on the left side to the clock-

wise position. Allow about a minute for the tubes to become sufficiently heated. Disc recordings may now be played through the speaker in the PHONOSCOPE.

MICROPHONE A high impedance magnetic or crystal microphone may be used in place OPEPATION of phonograph recordings. The two pin tips should be inserted in the microphone jack in the rear of the cabinet. The microphone may be used as

4 means of speaking or entertaining through the unit.

12586T 571L76T

n ten,,. rmt

2502

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MODEL 411 (PHONOSCOPE)

O

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l



DEWALD PAGE 10-3

.0/

a

6D6

DEWALD RADIO MFG. CORP.

Motor

Motor -Switch

6C6

i9

) T5

I00 000 - CRYSTAL

E_¡ PICK UP

0002

MODEL 531 Phono. MODELS 532,532LW Schematics

2326G

/Y%EL c5;5/l0'°442J

',S/ MAZOA 6C6 606 25L6G

25Z5

450n E[ o 1

_1_ i 16T

M--SSF Z°

KU- /1S AC -QC

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S/eC/F/ED

RANGES: 175 to 560 Meters 850 to 2000 Meters

606

Mag. Pick-up 2450-R-

)74

Motor

Fuse- Ampgç

ReGES: 175 to 560 Meters 850 to 2000 Meters

MODEL 532-532 L.W.

1481 1482 1488 2422 2423 2433 3420 6079 6080 7233

LIST

'57AI4ZM

O

251.66

6C6

23166

CHOKE

1425 FA

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50,000 50, 0 50000n 50,000

PRICES OF REPLACE' NT PARTS

antenna coil detector coil cent. tap choke 2 gang var. cond. comb, electrolytic 4.25 mfd. cond. comb.vol. cont. scale - crystal, speaker

.50 .50

1.50 2.00 1.00 2.00 1.00 .10 .25

3.50

8542 8777 8852 8854 9799 9914 9911

pilot lamp knob AC -DC switch pointer knob drum drive shaft pointer cabinet phono. vol. cont. phono. pickup phono. motor

2SL6G

4500. ico

MOTOA SWITCH 2W TOC PANEL

.15

.10

.75

.15

.15

.10

.10 12,50 1.00

11.50 17.50

MODEL 532- 532 L.W.

RADIO- PHONOGRAPH COMB/NATION

In model 532 L.W. [.1, Cl, L2 E C2 re in circuit.

In Model 53! 11. 12. Cl. F. C2 era canted.

TO CALIBRATE

Cenneet ertere.i O.eillator '. not lead to reel antenna of reeet.er.

C:21.112:7111::::1=0112:7212 onnect e.eillator cold lead in .erse. clin

.1 MIN epeee.ai to e Condor 050.1.. Set o.eillator .1 0500 RC and pact Variable Cund,0,er trimmer. for Maxlarae signal'witheom.n,er cat apprerteateU where 1500 cone. in on cale.



PAGE 10-4 D1r.«'ALD MODELS 537,537L'7,538, Dr.ALD RADIO MFG. CORP. 538L,5381;7,539, 539Lb' ScheLe.tic,I:otes

HOap I

CG

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w'nir:u)y'awo 10m wwrnO)orn H H H ri N N M d.

These models are five tube superheterodyne receivers with full automatic volume control. The range coverage of the model 538 is 1800 l.c. to 540 k.c. The model 538 L.W. has a long wove band added (150 k.c.-410 k.c.) They have been designed to operato on 105-125 volts, 40-60 cycles PC or DC unless otherwise specified.



I)L\t'AI.D PAGE 10-5

Q

Q

r r (M073)01

DF.WALD RADIO MFG. CORP. MODELS 655,655IN,

656,65GLZ"1

Schematic,Alignment 5114 line cord .30 6113 Dial Scale .85 6121 crystal escutcheon 1.00 O O tOt0 o O LO O LO 7230 speaker 4.00 tO LO N «) O LO C- O N

8916 pilot lamp .10 net ri H al r, H Ò

8918 pilot lamp assembly .25 8777 knob .10 9943 pointer .30 9944 drum 15

1

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V V V v v

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®John F. Rider, Publisher


PAGE 10-6 DEWALD

142.DEL 1102a3 Schematic , S oc ket, Tr immers Alignment

P/'04,0. MOOEL //oz

25 7.1

IF PEAK 456 KC zoo.,

MODEL 1102-3 71/7

6k1/ér /vn PAOPFe 600vr.c.

3Feree

o

DET

03

DEWALD RADIO MFG. CORP.

6ABG LH7

e 75 6 G 6/17 LM1: 6.47 Z.TZS 8664 8663

//oz ., o Eo e)U U .25,4,40.25,4,40PorLws a

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L szs rsec rseó

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DUMONT PAGE 10-1

ALLEN B. DUMONT LABS., INC. MODELS 180,181,182,183 Circuit Date. ,Controls Trouble Char t

GENERAL FEATURES These receivers are classed as

"Electrostatic and Direct Vision." Electro- static indicates that the entire deflection system is electrostatic and since the picture is viewed direct, without the use of a mirror, lens or other device, it is referred to as Direct Vision. The latter ensures clarity, brilliance and the widest angle of vision. Steady, clear cut, black and white pictures that are large enough for all the family to enjoy at one time are secured by the use of a fourteen inch cathode-ray tube which furnishes a picture eight by ten inches. A separate high fidelity section brings superb reproduction of the sound channel which is associated with the picture. A single control tunes both the sight and the sound channels so the receiver is no more difficult to operate than an ordin- ary broadcast receiver. To the above features add its compact size, minimum number of controls and simple straight forward layout and you will have an idea of the first com- mercial television receiver which we believe you will find easy to install and service in spite of the apparent complexity of the subject Television.

CIRCUIT ARRANGEMENT A simple straight line layout is used in

these receivers that should prove extremely helpful to the serviceman. Viewed from the front the video receiver is on the left side of the chassis and the sound receiver is on the right. Fig. No. 1 shows the front controls and the sound receiver while Fig. No. 2 shows the rear adjustments and the video receiver. The top portion of the chassis contains both sweep circuits along with the modulating circuits of the cathode-ray tube. To prevent con- fusion each side is considered separately, half appearing in Fig. No. 1 and the remainder in Fig. No. 2. The seven auxiliary controls shown in Fig. No. 2 are provided for the use of the installer and serviceman. These controls are necessary to make the final alignment of picture size and positioning when the receiver is installed under the operating conditions imposed by the earth's magnetic field and the power supply line voltages -Once properly set these controls do not need ád juatment and since they were not provided for the owner's use we suggest that the dealer or serviceman seal the back of the cabinet as it is not possible to tamper with the controls when the back is in place. The use of the parts and tubes shown in Fig. No. 1

and Fig. No. 2 can be checked by comparing the "V" numbers, etc., with the schematic drawings Operating Controls of the Receiver (Front)

First, become familiar with the controls on the front of the receiver. Since the receiver has been tested before shipment, probably only a few minor adjustments will be necessary. Therefore before touching the adjustments in the rear attempt to operate the set according to the instruction sheet supplied the pur- chaser and make only the adjustments required. These instructions are repeated here to cover the possible loss of this sheet. Figure No. 1 shows the front of the receiver with the controls numbered and the use and the purpose of these controls is as follows.

1. Marked CONTRAST, ON and OFF This is a power switch for starting and

stopping a set. It also is the volume control of the picture signal. It should be adjusted in conjunction with the intensity control (No. 4) to produce a picture of pleasing contrast to the user. If the location is such that the signal received is very small, it may be necessary to use the full gain of this control, while in a good location it may have to be retarded considerably. If the picture is not satisfactory the rear controls must be adjusted as covered in a following section.

2. Marked SELECTOR This control is a four position switch pro-

vided for coveting four television channels.

3. Marked TUNING Only one control is necessary to properly

tune both the sight and sound channels. Simply adjust this control until the best reception of the sound is secured and at this point the picture signal will be correctly tuned.

4. Marked INTENSITY The intensity or brightness of the picture

is controlled by this knob. It should be adjusted in conjunction with Control No. 1 to get the best picture. Note: It is a good plan to retard (turn to the left) this control when starting the set. If about 15 seconds is al- lowed to elapse before advancing this control it will prevent a small bright spot from appearing on the screen which might eventually darken the screen.

5. Marked FOCUS This control is used to sharpen the indi-

vidual lines of the pattern and once set sel- dom requires further adjustment.

6. Marked VOLUME This volume control adjusts the audio vol-

ume and has no effect whatever upon the picture.

Rear Controls of the Receiver As previously stated, the adjustment of

these controls is necessary for the final alignment of picture size and positioning, as the earth's magnetic field and power supply line voltages vary with locations. The location of these controls is shown in Figure No. 2 and their use will be covered in numerical order. Proceed as follows: remove the wood screws holding in the back of the cabinet and pull out the back. The safety switch will open, turning the set off and since it is necessary to have the set in operation while making these adjustments the switch can be made temporarily inoperative. (A large battery clip is convenient for this purpose.) Do not reach into the set with the voltages on. (See Cau- tions and Warning.) There is one adjustment that cannot be made by these controls, that

FAULT

No picture.

No scanning.

No modulation.

Poor focus.

Uneven brilliance.

Distorted picture.

Unsteady picture or flickers.

Double image.

Cathode-rav tube controls effect the picture and scanning.

Superimposed pattern on the picture.

Streaks across picture.

of rotating the Cathode-ray tube to cause the picture to properly line up with the viewing opening. To remedy this, turn the set off, remove the elastic band that grips the rear support and rotate the tube by hand in the correct direction.

The function of the seven rear controls are as follows:

1. Vertical Frequency Control This controls the frequency of the vertical

sweep. If the picture is not steady and slips past at intervals, vertically, this control should be adjusted until a steady picture is secured.

2. Vertical Size Control If the picture is too narrow and out of

proportion vertically this control will remedy the trouble.

3. Vertical Positioning Control As its name indicates, this, control will

move the pattern vertically, allowing the picture to be placed directly in the center of the opening.

4. Astigmatic Posit oning Control This is adjusted in conjunction with Con-

trol No. 5 to give the best possible focus on the corners of the picture.

5. Horizontal Positioning Control This control positions the picture hori-

zontally. 6. Horizontal Size Control The width of the picture is adjusted by

this control. 7. Horizontal Frequency Control

It no picture can be secured but modulation (dark and light spaces) can be seen on the screen, the setting of the horizontal frequency control is probably incorrect. Adjust this control until the picture forms.

With the adjustment of these controls the installation should be satisfactory. However, if the signal is weak or if ghosts or noise is present, return to the dipole antenna and make changes as previously suggested until the best position for it is secured.

LOCATION OF TROUBLE POSSIBLE CAUSES

1. Power supply trouble in any or all three sources. 2. Too much bias on modulator electrode. 3. Defective cathode-ray tube.

1. Trouble in 1500 volt power source. 2. Poor connections to deflection plates. 3. Defective scanning circuits. 4. Defective cathode-ray tube.

1. Defective or shorted antenna. 2. Defect in video receiver. 3. Too much bias on modulator electrode. 9. Defective cathode-ray tube.

1. Improper voltages supplied cathode-ray tube. (check entire divider circuit)

2. Defective video receiver. 3. Poor adjustments. 4. Defective cathode-ray tube.

1. Hum from power source. 2. Defective scanning circuits. 3. Scanning picked up by modulator circuits. 4. Screen burnt or discolored.

1. Poor synchronizing (circuit or adjustment). 2. Overloading (contrast control advanced too far) 3. Defective video receiver. 4. A.C. hum. 5. External interference.

1. Poor synchronizing action. 2. Leakage. 3. Varying voltages to cathode-ray tube or receiver. 4. Unsteady receiver. 5. Antenna loose or shorting.

1. Scanning circuits incorrectly adjusted. 2. Ghost images due to reflection of signals.

1. Cathode-ray tube defective, probably leaking and going soft.

1. Oscillation probably in the receiver.

1. Usually local interference such as ignition or diathermy.

L ©John F. Rider, Publisher


PAGE 10-2 DUMONT

2IDDEIS 180,181, 182, 183 ALLEN B. DUMONT LABS., INC. Chassis Views

Figure I

TUBE COMPLEMENT Type Purpose 1853 R.F. Amplifier 6J5M R.F. Oscillator 1852 First Detector 1853 1st Video I.F. Amplifier 1852 2nd Video I.F. Amplifier 6H6M Video 2nd Detector 1851 1st Video Amplifier 6V6G Video Power Amplifier 6J7G 1st Sound I.F. Amplifier 6J7G 2nd Sound I.F. Amplifier 6Q7G Sound 2nd Detector and Amplifier 6V6G Sound Power Amplifier 6J7G Horizontal Synch Separator 6AD5G Horizontal Sweep Oscillator 6R6G Horizontal Sweep Amplifier 6J7G Vertical Synch Separator 6AD5G Vertical Sweep Oscillator 6R6G Vertical Sweep Amplifier 2Y2 4100 Volt Rectifier 5X3 1600 Volt Rectifier 5Z3 350 Volt Rectifier 114-9-T Cathode-ray Tube (14")

V.decal f'r.aa.ncT Control

°i Harbonal Frequency Control

o

d x Ñ 4

cn W .x V fY a eÌ 9e' Horizontal Sir. Control.77

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Hormonal Paueon Control

Vertical Sise Control

A.ti°matrc Poulton Control

VU- 5i$

VU-$71G

VII -$g1G

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Frequency Ranges- Four Television Channels provided, present alignment as follows:

AUDIO VIDEO STEP STATION SIDE BAND CARRIER CARRIER

A NBC Single 49.75 45.25 B C

CBS Single 55.75 51.25 o ,rI

D NBC Double 49.75 46.5 N

Figure 2

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DUMONT PAGE 10-3

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Early Production

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PAGE 10-4 DUMONT 1.DDELS 180,181,182,183 Separator and Sweep ALLEN B. DUMONT LABS., INC. Voltage Divider Schen.tics,Notes

EARLY PRODUCTION Models

I

CR49 069

d a Á tl

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0

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V22

VI

6J7G

6J 76 V.2

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180/ 181 182 183

27 52 T13 CADS

cz C 104

T 14 5228

1 C 74 7 RH

R59 7S R65

REAR

Early Production

RM 080

C79

N

R04

L

4- B2 .4 1500V C64

83

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Figure 5 - Schematic Diagram, Separator and Sweep Circuits

R 68

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} 1500V

- 4000 V

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+82 +15oo

2.5 VOLTS

Figure 6 - Schematic Diagram,

Voltage Divider and

Socket Connections

G



DUMONT PAGE 10-5

LDDDLS 180,181,182,183 ALLEN B. DUMONT LABS., INC. S.P.L. Scherlatic

Voltage,Notes

CAUTION AND WARNING Large cathode-ray tubes operate at high

voltages and hence are evacuated to a very

high degree of vacuum. Therefore the atmos- pheric pressure on the glass can run into tans depending on the size of the tube. A collapse

therefore is as bad as an explosion and all

cathode-ray tubes should be handled with care.

The Du Mont Laboratories have gone to great expense to provide a cathode-ray tube that is

safe for the home and the structural design

results in its ability to stand tests nearly

twice as severe as usually employed. The

serviceman, however, should observe the fol-

lowing rules as he will probably be the only

one to handle the average tube.

1. Be careful in handling the tube.

2. Watch the use of tools near the tube.

,i. Don't scratch the surface of the glass.

i. Don't stand the tube on a metal surface or in any other way cause certain parts to he quickly heated or cooled.

115V- 60

ai 5265 T 1

T17

41. 3266

3ANPFUSE bd

SAFTY

A

TERMINAL VOLTAGES

Using Weston Model 772 20,000 Ohms per Voltmeter

(with Televerter)

Tube V9 V10 V11 V12 V8 V1 V2 V3 V4 V6

Plate 240 240 190 275 115 140 190 180 170 170

of

Screen 150 155

Grid (Control) - 4.3 - 4.3 - 2.2

290 -11.5

Notes

Cathode to ground.

190 - 2. Contrast on full. 190 - 3.5 180 - 2.25 170 - 2.25 185 - 2.0 Cannot be measured at the grid

V6. Should read -4 volts at center tap of 5Z3 high voltage winding to ground.

V7 140 225 - 7.5

V17 5Z3 filament to ground = 310 volts V13 5X3 filament to ground = 1600 volts

(output after L7 = 1550) V14 2Y2 output = 3950 to 4200 (ground is positive)

(output after R83 = 3800 to 4100 volts) The above measurements

were taken with respect to ground, the following are point to point.

V21 From cathode to grid -60 to -160 From cathode to first anode +800 to +1600 From cathode to second anode +5000

L6

TO HEATERS 144-9-T

R83 TO C.R.T. NETWORK _4000V

C99

SWEEP OSC_ANDAMPLIFIER {TO PLATES. TOC.R_T.NETWORK,.

+1800V - TO AUDIO OUTPUT Twin

+ 93+300V C90 4JO ALL STAGES IN VIDEO AND SOUND CHANNELS EXCEPT OUTPUTS

SFIÉLÖ ßfá

RA7 r087

TO ALL HEATERS EXCEPT C.R.T.

6.3V

Figure 7 - Schematic Diagram, Power Supplies

+ 824 290V TO SEPARATOR PLATES TO SWEEP AMPLIFIERS SCREENS TO V_F_AMPLIFIER

AND OUTPUT

1



PAGE 10-6 DUMONT MDDELS 180,181,182,183 Service Data, Parts ALLEN B. DUMONT LABS., INC.

R Ohms Watt

49 10,000 r/2

50 10 meg rh

51 6,000 pot 52 1 meg r/2

53 200,000 2

54 80,000 20

55 100,000 2

56 100,000 2

57 500,000 pot 58 15,000 y2

59 6,000 pot 60 50,000 r/2

61 25 meg 1

62 1.5 meg 1

63 1.5 meg 1

64 200,000 2

65 1 meg pot 66 5 meg y+

67 5 meg r/2

68 5 meg r/2

69 5 meg r/._

70 2 meg pot 71 2 meg pot 72 2 meg pot 73 300,000 r/._

74 300,000 r/y

76 750,000 2

76 15,000 r/._

77 1 meg 2

78 1 meg pot 79 750,000 2

80 100,000 pot 81 10,000 y2

82 35,000 10 83 100,000 1

84 100,000 1

87 100,000 2

88 1 meg 2

89 1 meg r/3

90 50,000 r/2

94 250,000 pot 95 40,000 r/2

96 50,000 1/2

97 50,000 pot 99 3,000 r/2

100 200,000 rh

RESISTOR VALUES EARLY PRODUCTION

R - Regular S - Special W -Wire

Chrss R Ohms Watt Class

R 200 500,000 pot S

R 201 2,000150 potr RR

W 202 R 203 5,000 1 R

S 204 400 r/2 R W 205 3,000 r/2 R

S 206 3,000 r/2 R S 207 3,000 r/._, R S 208 3,000 r/+_ R

R 209 150 r/+. R W 210 5,000 1 R

R 212 3,000 r/º R

R 213 3,000 r/: R

R 214 5,000 1 R

R 215 5,000 1 R

S 216 150 1/2 R 5 217 150 r/2 R R 218 5,000 r/2 R

R 219 Ime rH R A 220 100,000 pot S

R 221 1,500 1 R

R 222 5,000 1 R

R 223 1 meg lb, R R 224 1,000 2 R

R 225 25,000 r/2 R

R 226 25,000 rh R R 227 400 r/3 R R 228 100,000 %R S 2294,000 % R

S 230 1,000 r/º R R 231 100,000 rh R

R 232 4,000 r/2 R

R 233 50,000 r/2 R W 234 1.5 meg rh

11

R 235 2,000 rh R

R 236 50,000 r/2 R

R 237 10000 r4 R

S 238 50,000 r/2 R R 239 250,000 r/2 R

R 240 160 1 R

S 291 30,000 1 R

R 245 10,000 r/x R R 246 10,000 r/2 R

R 257 20 1 R R 258 500,000 r/2 R

R

CONDENSER VALUES

C. Mfd. Volts C. Mfd. Volts

69 .1 400 214 .01 400

70 .05 400 215 .01 400

71 .000075 1500 216 .001 400

72 .0025 900 217 3-30 trimmer 73 .0025 400 218 3-30 trimmer 74 .005 500 219 3-30 trimmer 75 25. 50 220 3-30 trimmer 76 .04 1600 221 3-30 trimmer 77 .0005 1500 222 3-30 trimmer 78 .25 400 223 3-30 trimmer ?9 .01 - 1200 224 3-30 trimmer 80 .04 1600 225 L53 81 .1 400 226 L53 82 25 600 227 L53A 83 .1 1000 228 L53A 84 .1 1000 229 T-20 85 .05 4500 230 T12A 86 .0005 400 231 T12A 87 16. 450 232 T12 89 8. 450 233 112 90 8. 950 234 T11 91 16. 450 235 T11 93 16. 450 236 .04 400

95 4. 1500 237 8. 450

96 4. 1600 238 .04 400

97 .2 4000 239 .01 400

98 2 4000 240 .000050 400

99 .2 4000 241 .02 400 100 .2 4000 242 .10 400 104 .0003 400 243 .25 400

105 .02 400 244 .02 400

106 25. 50 245 .10 400

110 .0002 1500 246 .25 400

200 3-30 mmf. trimmer 247 .0002 400

201 3-30 mmf. trimmer 248 .000050 400 202 3-30 mmf. trimmer 249 .01 900

203 3-30 mmf, trimmer 250 25. 25

204 3-5 variable 251 4. 450 205 .0006 400 252 .0006 400 206 .0006 400 253 .1 400 207 .0006 400 254 50. 25 208 .01 400 256 .0005 430 209 3-30 mmf. trimmer 257 .01 900 210 .0006 400 258 .0006 400 211 .01 400 259 .0006 400

212 .01 400 260 .01 400

2.13 .01 400 265 25. 25

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DUMONT PAGE 10-7

MODELS 180,181,182,183 ALLEN B. DUMONT LABS., INC. Antenna Data




EMERSON PAGE 10-1

TI

EMERSON RADIO & PHONOGRAPH CORP. MADELS CD206,CD215 Chassis CD

Schematic ,Voltage Alignment , Par ts

A.C.-D.C. Long and Medium -Wave T.R.F. Receiver T2

6D6

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POSITION POSITION NO.1- LONG WAVE 4 VOLTS POSITION NO.2- BROADCAST ACROSS

PILOT LIGHT

6C6 6D6 251.66

HEATER CIRCUIT

c15= L55BG

KEY

Voltage rating 105 to 125 volts

Power consumption 45 watts

Frequency range 535 to 1650 kc 366 to 143 kC

U á

25Z5

VIEW LOOKING AT PINS OF TUBE. OVERALL VOLTAGE DROP ACROSS BALLAST TUBE (L5586) 55 VOLTS AT .3 AMPS.

MODEL CD -206 CD -215

CHASSIS MODEL CD

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PAGE 10-2 EMERSON

M)DELS BX208,BX209 Chassis BX Schematic ,Voltage Alignment

C3 . 001 NIF

EMERSON RADIO & PHONOGRAPH CORP.

TI T2

6D6

AC OR DC LINE

VIEW LOOKING AT PINS OF BALLAST TUBE, WHICH HAS AN OVERALL VOLTAGE DROP OF 55V. AT .3 AMP. VOLTAGE DROP ACROSS PILOT LIGHT IS 4 VOLTS.

L55BG

C9 25L6G


25Z5 SPEAKER FIELD

D L_ r-roaa D (- 450 OHM S

C12 _C13 IG T16 MF MF

HEATER CIRCUIT

PILOT LIGHT 6.3V. -. 25 Avg'.

SCHEMATIC DIAGRAM 5 TUBE AC - DC RECEIVER

SCHEMATIC DIAGRAM FOR MODELS BX-208 and BX-209

The tube complement is as follows: 1-6D6, r -f amplifier. 1-6C6, biased detector. 1-25L6G, beam power output. 1-25Z5, dual half -wave rectifier. 1-L55BG, ballast tube.

TUBE DATA

Voltage rating 105 to 125 volts, a.c. or d.c. Power consumption 45 watts. Frequency range 540 to 1730 kc.

Note: Octal -base tubes may be replaced with either metal tubes or equivalent octal -base glass tubes.

VOLTAGE ANALYSIS Readings should be taken with a 1000 ohms -per -volt meter. Voltages listed below are from point indicated to ground (chassis) with volume control turned on full and no signal. The line voltage for these readings was 117.5 volts, 60 cycles, a.c. All readings except heaters and cathodes were taken on 250 volt scale.

Tube Plate Screen Cathode Fil. 6D6 100 100 2.3 6.3 6C6 20 15 2.1 6.3 25L6G 93 100 6.0 25.0

Voltage across speaker field -26 volts. 25Z5 cathode to ground -126 volts. Voltage across ballast tube (pins 3, 7)-55 volts. Voltage across pilot light section (pins 7, 8)-4 volts. The ballast resistor (L55BG on schematic) is in a special tube at the rear of the chassis. In normal operation this tube will become quite hot. For voltage drop specifications, see "Voltage Analysis" above.

ALIGNMENT PROCEDURE

An oscillator with a frequency of 1400 kc is required.

Use as weak a test signal as possible. An output meter should be used across the voice coil or output transformer for observing maximum response.

Rotate variable condenser to the maximum capacity position and set the pointer at the mixt calibration mark beyond 55. Then rotate the variable condenser until the pointer is at 140 and feed 1400 kc to the antenna through a .0001 mf mica condenser and adjust both trimmer condensers on the variable condenser for maximum response.



EMERSON PAGE 10-3

Schematic ,Voltage MOTELS CA208

Alignment ,Notes EMERSON RADIO & PHONOGRAPH CORP. CA209,CA234 Chassis CA

LI

A.C. - D.C., Superheterodyne Receiver, with Miracle Instamatic Tuning All tubes are replaceable with either metal

C19 or equivalent octal base glass tubes.

TI

C

C 195

Six Tubes, Including Ballast Tube

647

i D

061 C7

o V 1

RI

O

6D6 T4

Ce

O

C9

t,F. P EAKED AT 455 KC

C

C12

2 R O

R2 C13

-I13__

6Q7G I7 25L6G

TRANSFORMER

MW ON SPEAKER

R7

M

N

CIg 5

R4 R5

C16

R

Re

LINE SWITCH ON VOLUME CONTROL

SCHEMATIC DIAGRAM

C14

VIEW LOOKING AT PINS

OF BALLAST TUBE, WHICH HAS AN OVERALL VOLTAGE DROP OF 49V AT .3 AMP. VOLTAGE DROP ACROSS PILOT LIGHT IS 4 VOLTS.

KEY

25Z5

1 0

L49BG =c2o TC21

2525 25L6G 606 6A7 6076

HEATERS

PILOT LIGHT

MODELS CA -208. CA -209 and CA -234

GENERAL NOTES

1. If replacements are made or the wiring disturbed in the r -f section of the circuit, the receiver should be carefully realigned.

2. One side of the power line is directly grounded to the phassis base. Under no circumstances, therefore, should a

ground wire be permitted to come in contact with any metal part of the receiver.

8. In operating the receiver on d.c. it may be necessary to reverse the line plug for correct polarity.

4. The color coding of the i -f transformer leads is as follows: Grid-green Grid return-black B plus-red.

5. In congested areas where the installation of a large antenna is not desirable we recommend the use of the Emerson

Flexible Mast.Antenna, Model W-82. Instructions for the installation of this compact and efficient antenna are sup-

plied with each kit. Where the Flexible Mast is installed permanently, it is urgently recommended that the receiver antenna wire

be cut. Leave just enough of this wire to reach from the receiver to the window strip connector.

6. The wave -trap in the receiver has been adjusted for maximum signal rejection at 455 kc. If, however, persistent in-

terference is experienced from some particular telegraphic station, readjust the wave -trap trimmer until the response

from the interfering station is at a minimum.

ADJUSTMENTS

SPEAKER FIELD

ób00` 450 OHMS

CHASSIS MODEL C.1

An oscillator with frequencies of 456 and 1400 kc is required.

An output meter should be used across the voice coil or output transformer for observing maximum response.

Always use as weak a test signal as possible when aligning the receiver.

Location of Coils and Trimmer Adjustments

The two i -f transformers are in oblong coil cans located on top of the chassis deck. The first i -f transformer is the

one behind the variable condenser. The trimmers for these transformers are accessible through holes in the tops of the

cans. The trimmers for the antenna and oscillator coils are located on the variable condenser. The trimmer on the front

section is for the antenna coil. The 455 kc wave -trap is mounted on the same form as the antenna coil on the top of the chassis beside the variable

condenser. The trimmer for the 455 kc wave -trap is mounted on the coil and is accessible from the side of the chassis.

The oscillator coil is located underneath the chassis, beneath the first i -f transformer.

I -f and Wave -Trap Alignment

Swing the variable condenser to the minimum capacity position. Feed 455 kc to the grid cap of the 6A7 tube

through a .01 mf condenser and adjust the four i -f trimmers for maximum response. Feed 455 kc through a .0001 mf

condenser to the antenna lead and adjust the wave -trap for minimum response. (See General Notes, paragraph No. 6.)

R -f Alignment Set the dial pointer at 140. Feed 1400 kc through a .0001 mf condenser to the antenna lead and adjust first the

oscillator trimmer (on rear section of variable condenser) then the antenna trimmer (on front section of variable con-

denser) for maximum response.

A ô o > 0e o s> n .i

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tom

á



PAGE 10-4 EMERSON

EIDDELS CA208,CA209 CA234 Chassis C.A. EMERSON RADIO & PHONOGRAPH CORP. Tuner Data, Parts

REPLACEMENT PARTS *Item Part No.

UN Price .s Effective ee of

Sept. 15th. 1938 (subject te chante without notice)

DESCRIPTION PRICE Li, Tl 5YT-444 Antenna coil with adjustable 455 kc wave -trap $ .90

T2 4XT-433 Oscillator coil 86 T3 3RT-320C Double -tuned 455 kc first i -f transformer 1.10

T4 3RT-821C Double -tuned 455 kc second i -f transformer 1.10

Rl ZZR-196 30,000 ohm I watt carbon resistor .16

R2 KR -53 50,000 ohm I watt carbon resistor .16

R3 3FR-293 140 ohm % watt wire -wound resistor .16

R4 KR -57 1 megohm IA watt carbon resistor .16

R5 2NR-214F Volume control .25 megohm with line switch .90

R6 4XR-327 15 megohm I watt carbon resistor .16



149 -BG Ballast resistor tube. (Interchangeable with L -49B) .55

Cl, C2 6AC-407 Two -gang variable condenser 2.35

C8

f C4

tC5, C11

f C6, C7. C8, C9

NNC-199 0.001 mf, 600 volt tubular condenser Trimmer, part of wave -trap assembly. Trimmers, part of variable condenser.

Trimmers, part of i -f transformers.

.20

C10 BC -12 0.05 mf, 200 volt tubular condenser .20

C12 4XC-393A 0.00006 mf mica condenser .20

C13 AC -6 0.1 mf, 200 volt tubular condenser .20

C14 EEC -132 0.1 mf, 400 volt tubular condenser 20

C15, C18 5AC-384 0.0002 mf, 600 volt tubular or mica condenser .20

C16 3HC-274 0.002 mf, 600 volt tubular condenser .20

C17 LC -65 0.02 mf, 400 volt tubular condenser .20 C19 3FC-336 0.025 mf, 400 volt tubular condenser .20

C20, C21 4HC-348A Dual 20 mf, 150 volt dry electrolytic condenser 1.00 5BS-333 5" dynamic speaker 8.90

Coy o ó to o Ñ ó ó t1° o, 'Item number locates the article on the schematic diagr tThese condensers cannot be supplied separately.

ti o

*Z

to

When ordering

replacement parts

specify part number

I wirEK

FIG.2-op Loosen button by rotating court from ys to le turn. /_ )D Òim(f FIG.3 '

Tune in station with button pressed In firmly.

ojrj go. G

FIG.4 Press button in firmly while tighten- ing it with other hand.

STATION TAB

DUTTON 10 CELLULOID CAP

FIG.5 Insert station tab in button with celluloid cap over tab.

PREADJUSTMENT OF STATION BUTTONS Select four nearby stations desired for automatic tuning. Choose one of these stations and any button to be adjusted for it. Follow the procedure outlined below.

1. Loosen the push-button to be adjusted by rotating it counter -clockwise from IA to %2 turn. See Fig. 2.

2. Push the button in as far as it will go and, holding it in firmly, tune in the desired station by means of the selector knob. See Fig. 3.

8. Hold button in with finger of one hand and tighten securely with the other hand. Release the button and tighten it further if possible. See Fig. 4.

4. Remove the tab bearing the station call letters from one of the cards supplied in a separate envelope with the receiver. Insert the tab in the button, pressing it in firmly. Four celluloid caps are supplied in a separate envelope with the receiver. Snap one of these caps into the button over the station tab.

te- co d. Ot Ñ 010 u S co CO CCVV

O. L- t. Check the adjustment of the button by detuning the station by means of the selec- w m N

e N+

m yw tor knob and then pressing the push-button in as far as it will go. The station should come back in clearly and with maximum volume.



EMERSON PAGE 10-5

Schematic,Voltage 11DDELS AXLVP211

Alignment,Notes EMERSON RADIO & PHONOGRAPH CORP -212,-217,-235 -237,-238,-239 -257 *Chas .AXIR

4

Voltage rating C3 Power consumption ooess.F

TI 6A8GT

C6

WAVE BAND SWITCH SHOWN R2 IN BROADCAST POSITION

POSITION N0.1 BROADCAST NO.2 LONG WAVE . SOMr

00004 neF C23

131,

SION C24 _ b

105-126 volta 46 watts

IF PEAKED AT. 455 K.C.

T2/ 6K7GT 3

RII JC25 25Z6GT

AC OR DC UNE

LINE SWITCH ,),/ ON VOLUME CONTROL

CHASSIS MODEL ARLW

1so" 40-""

LINE CORD

g.s V .y5v

PILOT LIGHT

6Q7GT

,25 roce C16

Toot.

SPEAKER FIELD

0000 450 OHMS

C20 C2I =yo mF

00"O 1

cle

nu_

SOOM

HEATERS

Models AXLW-211, AXLW-212, AXLW-217, MCIW-235, AXLW-237, AXLW-238, AXLW-239 and AXLW-257

Y 0 0

MODEL AXLW 5 TUBE AC -DC RECEIVER

25L6GT C19 o o

sows Ed r

too -"- R3


Frequency range 640 to 1650 kc (666 to 183 meter) 167 to 370 kc (1910 to 310 meters)

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PAGE 10-6 EMERSON MODELS CJ211,CJ217,CJ235 CJ257 Chassis CJ EMERSON RADIO & PHONOGRAPH CORP.

TOQ0.156 Five -Tube, A.C. - D.C., Superheterodyne Receiver

03 MFTI

AC OR OC UNE

CI

LINE SWITCH ON VOLUME CONTROL ,/MA"

12A8GT

I.F PEAKED AT 455 K C. 71 MF T2% 12K7GT r3 12Q7GT

R9

Cp

PILOT LIGHT

35Z4GT SPEAKER

FIELD

006b` 450 OHMS

C20 TC21 T24HF 120MF

CI7

11

.024 MG

R7

HEATERS

VVVV o D v RIO _ a Á N

35L6GT

Alignment. Schematic,Voltage


SCHEMATIC DIAGRAM FOR MODELS CJ -211, CJ -217, CJ -235 AND CJ -257 CHASSIS MODEL CJ

The tube complement is as follows: 1-12A8 or 12A8GT, pentagrid oscillator modulator. 1-12K7 or 12K7GT, first i -f amplifier. 1-12Q7 or 12Q7GT, diode detector, a -f amplifier a.v.c. 1-35L6 or 35L6GT, beam power output. 1-35Z4 or 35Z4GT, half -wave rectifier.

The color coding of the i -f transformer leads is as follows: Grid-green Plate-blue Grid return-black B plus-red.

Location of Coils and Trimmer Adjustments The first i -f transformer is mounted on top of the chassis deck beside the speaker. The trimmers are accessible

through holes in the top of the can. The second i -f transformer is mounted underneath the chassis beneath the variable condenser. The trimmers are

accessible through holes in the top of the chassis directly beneath the variable condenser. The trimmers for the antenna and oscillator coils are located on the variable condenser. The trimmer on the front

section is for the antenna coil.

The 455 kc wave -trap is mounted on the same form as the antenna coil directly behind the speaker. The trimmer for the 455 kc wave -trap is mounted on the coil and is accessible from the rear of the chassis. The oscillator coil is located underneath the chassis, beneath the first i -f transformer. I -f and Wave -Trap Alignment

G o

IF PEAK 455 FC m É ÿ ÿ H os

4. Ú

U d OD s. y

Cf

O O f.

> a Ss.

Swing the variable condenser to the maximum capacity position. Feed 455 kc to the grid -cap of the 12A8 tube through a .01 mf condenser and adjust the four i -f trimmers for maximum response. Feed 455 kc through a .0001 mf condenser to the antenna lead and adjust the wave -trap for minimum response. (See General Notes) R -f Alignment

Set the dial pointer at 140. Feed 1400 kc through a .0001 mf condenser to the antenna lead and adjust first the oscillator trimmer (on rear section of variable condenser) then the antenna trimmer (on front section of variable condenser) for maximum response. VOLTAGE ANALYSIS

Readings should be taken with a 1000 ohms -per -volt meter. Voltages listed below are from point indicated to B minus with the volume control turned on full and no signal. Line voltage for these readings was 117.5 volts, 60 cycles, a.c. All readings except heaters and cathodes were taken on 250 volt scale. Measurements made with 117.5 volts d.c. will be lower than those given below.

Tube Plate Screen Cathode Ose. Plate Fil. 12A8 94 50 0 94 12 12K7 94 94 0 - 12 12Q7 40 - 0 - 12 36L6 87 94 5.2 - 35

Voltage at 35Z4 cathode ---121 volts. Voltage across pilot light section of ballast resistor (R9)-3.5. Voltage across speaker field -27 volts. Voltage drop across entire ballast resistor (R9 and R10)-13.5.



EMERSON PAGE 10-7

PRODUCTION CHANGES 1. Ballast resistor tube L -49B must be ordered for replacement in Models BJ-218 and BJ-220. 2. Condenser C27 is not used on Model BJ-220.

6A7 T2 606 T3 607G 74F 25L6G

WAVE BAND SWITCH SHOWN IN BROADCAST POSITION. POSITION NO.1 POLICE

NO.2 BROADCAST

.1

MF

So e CI3 C12

IF PEAKED AT 455 K.0

5 TUBE A.C., D.C. COMBINATION RADIO AND PHONOGRAPH

CRYSTAL PICKUP

MODELS BJ218,BJ220 EMERSON RADIO & PHONOGRAPH CORP. Chassis BJ

Schematic ,Voltage Changes ,Alignment

WIRING AND APPARATUS 2 ON MOTOR BOARD

R14 Re

I

RI7 I

.5 b

WEB

PHONO. RADIO SWITCH SHOWN

FEMALE IN RADIO POSITION

REC PTACLE TO AC OR D.0 LINE

C27 .O, AUTOMATIC HTO SP

r.

Location of Coils and Trimmer Adjustments The two i -f transformers are located on top of the chassis deck. The first i -f transformer is the one directly behind

the variable condenser. The trimmers for the two i -f transformers are available through holes in the tops of the cans. The trimmers for the antenna and oscillator are located on the variable condenser. The trimmer on the front

section is for the antenna. The 455 kc wave -trap is mounted on the front chassis wall beneath the variable condenser. The trimmer for the 455

kc wave -trap is mounted on the coil and is accessible from the bottom of the chassis. The color coding of the i -f transformer leads is as follows:

Grid-green Plate-blue Grid return-black B plus-red

1-f and Wave -trap Alignment Rotate the wave -band switch to the broadcast (clockwise) position. Set the variable condenser at the minimum

capacity position and feed 455 kc, through a 0.02 mf paper condenser, to the grid cap of the 6A7 tube (do not remove the grid clip from the tube). Adjust the four i -f trimmers for maximum response. Feed 455 kc to the antenna through a standard dummy antenna (a .0002 mf condenser may be used as a Substitute) and adjust the wave -trap trimmer for minimum response. (See General Note No. 7.)

RED

SHIELD

TO FEMALE

RE

4131 ACLE Jlw__/y

iCl4 1

MF LINE SWITCH ON L49BG VOLUME CONTROL

VIEW LOOKING AT PINS OF BALLAST TUBE, WHICH HAS AN OVERALL VOLTAGE DROP OF 49V. AT.3AMP VOLTAGE DROP ACROSS PILOT LIGHT IS 4 VOLTS.

2 5Z 5 R13

175-` C23 =MF

PIA SPEAKER

G- Z 30Co

OUTPUT MF í3 V TRANSPoRMERBj ON SPEAKER ,d á+4

Óce 0 1., 0,O "IKOÿá

Al ca

Ó1+?C owoo ,o w co

a.

wBeo 0w

C25

Y 25Z5 25L6G 6D6 6A7 607G

PILOT HEATERS

LIGHT El -7)d MODEL BJ-218

SCHEMATIC DIAGRAM

BJ-220

R -f Alignment With the wave -band switch in the broadcast position, clockwise, set the dial pointer at 140. Feed 1400 kc through a standard dummy antenna (a .0002 mf condenser may be used as a substitute) to the antenna lead and adjust first the oscillator trimmer (on rear section of variable condenser) then the antenna trimmer (on front section of variable con-

denser) for maximum response. The tube complement is as follows: The police band is self -tracking and does not require any adjustment. 1-6A7 pentagrid oscillator-modulatòr.

1-6D6 first i -f amplifier. 1-6 7G diode detector, a -f amplifier, a.v.c. NOTE: The Model BJ-200 should be aligned with the 1-25L6G beam power output. chassis bottom plate in place. 1-25Z5 dual half -wave rectifier.

VOLTAGE ANALYSIS 1-L -49B

Readings should be taken with a 1000 ohms -per -volt meter. Voltages listed below are from point indicated to ground (chassis) with the volume control turned on full and no signal. Line voltage for these readings was 117.6 volts, 60 cycles, a.c. All readings except cathodes and heaters were taken on 250 volt scale.

MODELS BJ-218 and 220

Plate Screen Cathode Osc. Plate Heaters 84 46 2.0 84 6.3 Voltage at 25Z5 cathode -130 volts. 84 84 2.8 - 6.3 Voltage across speaker field (Models RJ-200, 210 and 214)--28 volts. 35 - 1.0 - 6.3 Voltage drop across ballast tube L-49BG (pins nos. 3, 7)-49 volts.

115 84 5.5 - 25 Voltage drop across pilot light section (pins nos. 7, 8)-4 volts.



PAGE 10-8 EMERSON

8,BL22Ô Chassis BL Schematic ,Voltage

1. In receivers used in phonograph combinations: R2 is 40,000 ohms 1 watt, part No. 2NR-217

2. Receivers bearing serial numbers below 1,802,875 used a 0.00006 mf mica condenser, part No. 4XC-393A, at C12.

3. Receivers bearing serial numbers below 1,800,200 used dial drive shaft and pulley, part No. 5JZ-822.

N.

EMERSON RADIO & PHONOGRAPH CORP. Changes,Alignmemt

PRODUCTION CHANGES

Frequency ranges

TI

CRYSTAL PICKUP

MOTOR

-CIo Taos

MF

606 T3

C6 q ,o 7 C25

I RED

YELLOW

GROUND TO CHASSIS

540 to 1580 kc. and 1580 to 4200 kc.

6Q7G CIA 41

Mf

RB 1/\./\/V

/0 MEG.

1

I IF PEAKED AT 455 KC I -

LINE SWITCH ON VOLUME CONTROL

PHONO RADIO SWITCH SHOWN IN RADIO POSITION

TO AC LINE j

FEMALE RECEPTACLE J

WIRING AND APPARATUS ON MOTOR BOARD

WAVE BAND SWITCH SHOWN IN BROADCAST POSITION

POSITION NO.1 POLICE NO.2 BROADCAST

The color coding of the leads of the i -f transformers, is as follows: Grid-green Plate-blue Grid return-black B plus-red

The color coding of the power transformer leads is as follows: Primary-two black leads 6.3 v. sec.-two heavy green leads High voltage sec.-two red leads 5 v. sec.-two heavy yellow leads High voltage sec. center tap-red and yellow lead

With a few exceptions, the color coding of the general wiring is as follows: Plate-blue A.v.c. and cathode-white or yellow B plus-red Grid-green Screen-brown Filament and ground-black


TO FECEPTACMALE - RELE

T5

P.M. SPEAKER

.00la 4. MF 0 P OUTPUT TRANSFORMER ON SPEAKER

Joao -'t

8MF

6A7 6D6 6076 WI

HEATER CIRCUIT

MODELS BL -218, BL -220 5 TUBE A.C. COMBINATION RADIO AND PHONOGRAPH

PILOT - LIGHT

4) se 3 ÿ ,ç Y

A

at

43

2

The two i -f transformers are located on top of the chassis deck. The first i -f transformer is the one directly behind á u Y

the variable condenser. The trimmers for the two i -f transformers are available through holes in the tops of the cans."`":::,

The trimmers for the antenna and oscillator are located on the variable condenser. The trimmer on the front a c section is for the antenna. A>:'"''.-3'

The 455 kc wave -trap is mounted on the front chassis wall beneath the variable condenser. The trimmer for the 455 ti kc wave -trap is mounted on the coil and is accessible from the bottom of the chassis. °" o ;;

l -f and Wave -trap Alignment Y

Rotate the wave -band switch to the broadcast (clockwise) position. Set the variable condenser at the minimum., ,g,-5,11 capacity position and feed 455 kc, through a 0.02 mf paper condenser, to the grid cap of the 6A7 tube (do not remove ÿ;., a)

the grid clip from the tube). Adjust the four i -f trimmers for maximum response. Feed 455 kc to the antenna through N ú-c> Sr

a standard dummy antenna (a .0002 mf condenser may be used as a substitute) and adjust the wave -trap trimmer for ,->'"4 m c

minimum response. (See General Note No. 1.) t Nd.", c a

R -f Alignment c>.,.,.=..,., Ñ ÿ

With the wave -band switch in the broadcast position, clockwise, set the dial pointer at 140. Feed 1400 kc through a c dx standard dummy antenna (a .0002 mf condenser may be used as a substitute) to the antenna lead and adjust first the ova h oscillator trimmer (on rear section of variable condenser) then the antenna trimmer (on front section of variable con- S °a, ,. denser) for maximum response.

o a á.- A cn E-4 0

The police band is self -tracking and does not require any adjustment. VOLTAGE ANALYSIS S 2.c x Readings should be taken with a 1000 ohms -per -volt meter. Voltages listed below are from point indicated to ground á N " 2

ce d (chassis) with the volume control turned on full and no signal. Line voltage for these readings was 117.5 volts, 60 E g, 3

cycles, a.c. All readings except heaters were taken on 250 volt scale. ° Tube Plate Screen Cathode Ose. Plate Fil. 6A7 182 70 0 182 6.3 a.c. 6D6 182 70 0 - 6.3 a.c. 6Q7 87 - 0 - 6.3 a.c. 41 *165 182 0 - 6.3 a.c.

bU a.^,

p vÿ ° o CLYo

a t H 841 t gy

Voltage across speaker field (Models 200, 210 and 214)-70 volts. B plus at 80 tube filament (Models 200, 210 and 214)-18 Voltage from B minus to chassis (Models 200, 210 and 214)-80 v B plus at 80 tube filament (Models 218 and 220)-232 volts

Voltage from B minus to chassis (Models 218 and 220)-54 volts. *Voltage at 41 tube plate in Models 218 and 220 is 220 vol

2v ta


EMERSON PAGE- 10-9

NDDELS Aä221 AC

Chassis AX EMERSON RADIO & PHONOGRAPH CORP. A_X221 AC DC Schentics, Voltage ,Changes AX222,AX232 AC ,

y IF PEAK 455KC 6

AX232 AC DC 06

TI

6A2 a 6K7 TD 607 d 25L6 r+ caF cl CS C7 CB C9 Cº Ó 3

,

a ¡- aQ o -4- ____?;

RANSEDRMER O ,7 ON SPEAKER }}

-$ R7

_CO 1

<<//

,0,... b

RI"% RIB X. RJ a ri .-I

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RE Dy I Fb /ELLDW;

iH

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011 G2r 1

C w O' C1 ó R. «,t,. ß- " O ~,

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S SAOD SWITCHONG PUDIC/ I#IPI1050.

R12

CRTSTAL 11RWffU ACpC MpIORI C2 RCKUP PART NQ AC -SA

J

CI+ W 25Z6 7 =

iP ITO LINE

R9

1

0

LINE CORO

C21

SCHEMATIC DIAGRAM W -.R .ProTDR w 6 TUBE AUTOMATIC RECORD CHAMBER COMBINATION

LINE SWITCH

R6

0 =C2D

2526 251_6 607 6AB 607

PILOT NEATENS LIGHT

MODELS AX -232 AC and AC -232 AC -DC

FOR RECORD CHANGER DATA SEE INDEX CHASSIS MODEL AX

CO

IF PEAK 455 KC

6A6 n 6K7 TO

1 C6

á ó 6

I P PEAKED AT 163 RC

C

CO

C12

2

607

vVv`6Q R6

RS

TD16

C16

-11 25L6

GROUND 70 CI.1At6

MON) RADIO SWITCH SHOWN IN PRO.IO POSITION

UBE WRN AC -OC MOTOR, PART NO. 369WI101 ÁK22

SCHEMATIC DIAGRAM 6 TUSE COMSINATIOII

C2

C21

MELD

RIZ R17

CRYSTAL PICKUP

MOTOR

CIA

J

p

CIº f r

TO UNE R9 RIO

LINE CONO

MOTOR LINE SWITCH

OUTUSIT 1 ON SPEIIR

514

C20 C26

2526t261_6 667 RAB 6O7

PILOT (CATERS LIGHT

MODELS AX -221 AC, AX221 AC -DC and AX -222 CHASSIS MODEL AX

Tube Data The tube complement is as follows:

1-6A8 or 6A8GT, pentagrid oscillator modulator. 1-6K7 or 6K7GT, first i -f amplifier. 1-6Q7 or 6Q7GT, diode detector, a -f amplifier, a.v.c. 1-25L6 or 25L6GT, beam power output. 1-25Z6 or 25Z6GT, dual half -wave rectifier.

All tubes are replaceable with either metal or equivalent bantam glass tubes. PRODUCTION CHANGES

AX -221 and AX -222 chasses bearing serial numbers below 1,890,976 do not have R16, 100,000 ohm resistor, connected in series with the yellow lead to phono -radio switch. AX -221 and AX -222 chasses bearing serial numbers below 1,914,451 do not contain resistor R17. On model !LX -222 a 0.01 mf, 400 volt condenser is connected from B plus to the speaker frame. Another 0.01 mf condenser is connected from the motor mounting plate to ground. AX -221 and AX -222 chasses below serial number 1,921,165 have a 210 ohm, i/2 watt wire -wound resistor at R15.

Fcd Á H ó O d

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-)l

ó



PAGE 10-10 EMERSON MODELS AX221 AC

AX221 AC -DC EMERSON RADIO AX222,AX232 AC

AX232 AC DC

C O

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num Part No. Ll, T1 4XT-432 Antenna coil with adjustable 455 kc wave -trap E .90 T2 4XT-434 Double -tuned 456 kc first i -f transformer 1.10

¿i TS 4XT-435 Double -tuned 465 kc second i -f transformer 86 s T4 4XT-433 Oscillator coil .86 E Rl 2CR-193 30,000 ohm 'A watt carbon resistor .16 2 R2 KR -63 50,000 ohm 14 watt carbon resistor .16 c R3 3FR-293 140 ohm 54 watt wire -wound resistor .16

R4, R17 KR -57 1 megohm %4 watt carbon resistor .16 R6 4XR-335 Volume control .25 megohm with line switch .90 a R6 4XR-327 16 megohm %4 watt carbon resistor .16

.)- R7 KR -66 260,000 ohm R8 KR -b6 500,000 ohm

%watt carbon resistor - .16 watt carbon resistor .16

u R9, R10 4XW-112 Resistance line cord with pilot light ballast section. R9-160 ohms; ß1O-40 ohms 86 R13 4LR312B Tone control .6 megohm with motor line switch 1.05 R14 4XR-334 2,500 ohm 1 watt carbon resistor .16 R16 4ZR-325 175 ohm 1 watt metallized resistor. (See prod. change No. 4.) .16 R16 KR -54 100,000 ohm % watt carbon resistor. (See prod. change Na 1.) .16 R18 4XR-342 Tone control .5 megohm .70 Cl, C2 4XC-391A Two -gang variable condenser (for 219 and 221) 2.40 Cl, C2 4XC-412 Two -gang variable condenser (for 222 and 232) 2.75

e C3 4XC-401 0.00055 mf mica condenser .20 to fC4 Trimmer, part of wave -trap assembly.

u fC5, C11 Trimmers, part of variable condenser. tC6, Cl, C8, C9 Trimmers, part of i -f transformers.

a 5 C10 BC -12 0.05 mf, 200 volt tubular condenser .20 C12 4XC-393A 0.00006 mf mica condenser .20

:5: C13 AC -6 0.1 mf, 200 volt tubular condenser .20

c C14 EEC -132 0.1 mf, 400 volt C15, C18 XC394A 0.00022 mf

tubular condenser mica condenser

.20

as m

C16 3HC-274 0.002 mf, 600 valt tubular condenser .20

Ñ Cl? LC -66 0.02 mf, 400 volt tubular condenser .20 13

a C19 3FC-336 0.026 mf, 400 volt tubular condenser .20

c C20, C21 4HC-348B Dual 20 mf, 160 volt dry electrolytic condenser .90

s 2 C22 IC -47A 0.0005 mf mica condenser .20

C23 4XC-404 20 mf, 136 volt dry electrolytic condenser .65

3 m C24 3LC-297A 0.01 mf, 400 volt molded condenser (used only with ac -dc motors) .20

C25 HC -34 0.006 mf, 600 volt tubular condenser .20 4VC-371A 0.0008 mf mica condenser .206

TTS-111S Phono -radio switch 4BL-94 Pilot light, 6.3 volt, .25 amp., Mazda No. 44 .20 4YZ-772 Drive cord .02 6JZ-824 Drive cord spring .06 4X2 -811A Drive shaft .06 4XZ-816 Dial face fasteners .01 3LM-268 Needle cup (for 219 and 221) .20 3GM-251 Needle cup (for 222) 75 4MZ-588B Dial pointer (for 221, 222 and 282) .20

4XE-3 Dial crystal (for 221, 222 and 232) .20

4XD-61 Dial face (for 221, 222 and 232) .66 4PS-303A 6',4 permanent magnet dynamic speaker (used on 221, 222 and 282) 6.70

GENERAL NOTES 1. If replacements are made or the wiring disturbed in the r -f section of the circuit, the receiver should be carefully

realigned. 2. One side of the power line is directly grounded to the chassis base. Under no circumstances, therefore, should a

ground wire be permitted to come in contact with any metal part of the receiver. 3. The filament dropping resistor (R -9 -see schematic) is a resistance wire in the special line cord. The cord will, there-

fore, become warm under normal operating conditions. To insure good heat radiation stretch out the line cord to ill full length. Do not attempt to shorten it by cutting..

4. In operating the a.c.-d.c. combinations on d.c. it may be necessary to reverse the line plug for correct polarity. 5. The color coding of the i -f transformer leads is as follows:

Grid -green Plate -blue Grid return -black B plus -red.

6. In congested areas where the installation of a large antenna is not desirable we recommend the use of the Emerson Flexible Mast Antenna, Model W-82. Instructions for the installation of this compact and efficient antenna are supplied with each kit.

Where the Flexible Mast is installed permanently, it is urgently recommended that the receiver antenna wire be cut. Leave just enough of this wire to reach from the receiver to the window strip connector.

7. The wave -trap in the receiver has been adjusted for maximum signal rejection at 455 kc. If, however, persistent interference is experienced from some particular telegraphic station, readjust the wave -trap trimmer until the response from the interfering station is at a minimum.

8. The receivers in these combinations are of the a.c.-d.c. type. The motors, however, in models 219, 221AC and 282AC are of the AC ONLY type and will be damaged if the combination is used on direct current.

9. To remove the 6A8 tube from its socket, push up on its center pin from beneath the chassis.

ADJUSTMENTS

á

e)O ea. 0 "+O.Dm

á

coc d 00 .-INO Oa 2}7}]b°41W°4 aaN %NNN g4éwvvxvvév

,-1 a

N

d 9'12

x,,qer

N N

N

Ne

w

O

q

eááfi ááx.

N N

N

Chassis AX & PHONOGRAPH CORP. Alignment,Notes

Parts REPLACEMENT PARTS

A.2.2`2.12

i:... .rd.. . d 1H

iaubkc' 'o da.-w,hup. o ú.tn u'«)

DESCRIPTION PRICE

An oscillator with frequencies of 466 and 1400 kc is required.

An output meter should be used across the voice coil or output transformer for observing maximum response.

Always use as weak a teat signal as possible when aligning the receiver.


The first i -f transformer is mounted on top of the chassis deck beside the speaker. The trimmers are accessible through holes in the top of the can.

The second i -f transformer is mounted underneath the chassis beneath the variable condenser. The trimmers are accessible through holes in the top of the chassis directly beneath the variable condenser.

The trimmers for the antenna and oscillator coils are located on the variable condenser. The trimmer on the front section is for the antenna coil.

The 455 kc wave -trap is mounted on the same from as the antenna coil directly behind the speaker. The trimmer for the 455 kc wave -trap is mounted on the coil and is accessible from the rear of the chassis. The oscillator coil is located underneath the chassis, beneath the first i -f transformer.

l -f and Wave -Trap Alignment

Swing the variable condenser to the maximum capacity position. Feed 455 kc to the grid -cap of the 6A8 tube through a .01 mf condenser and adjust the four i -f trimmers for maximum response. Feed 466 kc through a .0001 mf condenser to the antenna lead and adjust the wave -trap for minimum response. (See General Notes, paragraph No. 7.)

R -f Alignment

Set the dial pointer at 140. Feed 1400 kc through a .0001 mf condenser to the antenna lead and adjust first the oscillator trimmer (on rear section of variable condenser) then the antenna trimmer (on front section of variable condenser) for maximum response.



EMERSON PAGE 10-11

LIDDEL BQ223 EMERSON RADIO & PHONOGRAPH CORP Chassis BQ

Schenatic,Voltage Changes ,Alignment

AUTOMATIC STOP AND SWITCH

WAVE BAND SWITCH SHOWN IN BROADCAST POSITION POSITION NO.I BROADCAST

NO.2 SHORT WAVE

FOUR POSITION TONE CONTROL SHOWN IN MAX. BASS POSITION VIEW OF SWITCH LOOKING AT REAR

vi ú ß

á

l w

b á

(p ggM

8 y O /i 7á P Mf

W o p

Voltage rating 105-125 volts, 80 Cycle, e.C. ¡¡, o wq

Power consumption 66 watts. P`l, ó ó ` á 5at Frequency ranges 640 to 1780 kc and 6.8 to 18,Sg ám uá ° G

TRANSFORMER

WU ?1!1g óa

i

FIELD 2 a F aóü °OU

o 5111711 ANCNORAGE

(1)vim SPEAKER PLUG LOOKING AT PINS. SEE ENCIRCLED NUMBERS ON SCHEMATIC FOR CONNECTIONS.



PAGE 10-12 EMERSON MODELS BR224 BR224A.Ch.BR Voltage Alignment

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EMERSON PAGE 10-13

MDNIS BR224 EMERSON RADIO & PHONOGRAPH CORP. BR224A

Chassis BR Schematic ,Notes

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Voltage rating 105-125 volts, 60 cycles, a.c. Power consumption 135 watts at 117.5 volts.

20 watts for phonograph motor. Frequency ranges 540 to 1800 kc, 1800 to 6,250 kc

and 5.8 to 22.0 megacycles.

1-6K7, R -f amplifier (behind right-hand section of variable condenser). 1-6K8, Triode-hexode, oscillator -modulator (behind left-hand section of variable condenser). 1-6K7, I -f amplifier (between the two i -f transformers). 1-6Q7, Diode detector, audio amplifier, a.v.c. (left rear corner of chassis). 1-6J5, Phase inverter (left side of chassis, third from rear). 2-6J5, Second audio amplifiers (left side of chassis, second from. rear, and right side of chassis beside

ectrolytic condensers). 4-6AC5G, Dynamic coupled, power output (two are in front of power transformer; other two are alongside

power transformer near variable condenser). 2-80, Rectifiers (beside power transformer, at rear of chassis).


PAGE 10-14 EMERSON

LflDEL BR224A EMERSON RADIO & PHONOGRAPH CORP. 2DDELS AX232 AC,AX232 AC DC Record Changer Data

MODEL AX -232, A.C. Five -tube A.C. Portable Combination

Part No. 4XPM- 18A used with

MODEL AX -232, A.C.-D.C. Five -tube A.C.-D.C. Portable Combination

Part No. 4XPM-18 used with

MODEL BR -224A Thirteen -tube A.C. Radio -Phonograph Combination

AUTOMATIC OPERATION I. Turn the receiver "on" in the usual way.

2. Rotate the phono -radio switch knob counter -clockwise to the phonograph position. Wait about a half -minute for the tubes in the receiver to warm up.

3. See that the pick-up is over the needle gauge plate with needle properly in place. If not, complete a cycle as follows: Throw the turntable switch "on." The turntable will start to revolve and the cycle of motion on the pick-up arm will follow through. When the pick-up arm comes down (and it can be moved by hand) the cycle is completed. Turn off the turntable switch.

4. The Index and Record Reject Lever are located near the right front corner of the motor board. With this lever at "Manual" position place the records on the record holder shelves. The records should be arranged in the desired order with the desired selection face up and the last selection on top. The first record to be played will rest directly on the shelves. The turntable should be empty.

5. Throw the turntable switch to the "on" position. The turntable should start to revolve.

6. While the turntable is revolving, push the Index and Record Reject Lever to the "Reject" position and let go. When the lever is released, after it has been pushed to "Reject," it will return automatically to the "10" position. If all the records to be played are 12 inch, return the lever to the "12" position. The changer will then begin to go through its cycle and the first record will drop on the turntable. The entire series of records will then be played automatically in sequence.

7. Adjust to the desired volume by means of the regular receiver volume control.

8. Close the cabinet lid to eliminate normal mechanical noises due to needle vibration.

The whole series of records will now play without further attention, and the last record will repeat until the turntable switch is turned off. Allow the record -changing mechanism to complete its cycle before the turntable is stopped. Then lift the pick-up, swing the arm to the right beyond the edge of the record and lower it onto the pick-up rest with pick-up over needle gauge plate. The record player is then ready for reloading, or for manual operation.

MANUAL OPERATION 1. Proceed as in steps 1, 2 and 3 under Automatic Operation.

2. Place record on turntable with desired selection upwards.

3. Set Index and Record Reject Lever to "Manual" position. The lever should be kept in this position when not actually playing records automatically.

4. Throw the turntable switch on and when turntable has attained speed, lift pick-up and gently lower onto the record, so that the needle point enters the outside groove.

5. Proceed as in steps 7 and 8 under Automatic Operation.

SPECIAL PRECAUTIONS 1. This instrument is not recommended for playing 10 inch and 12 inch records in mixed sequence. If the user desires

this service he must be positive that all records are perfectly flat and free from warp. The Index and Record Reject Lever must be set at "10" and after playing the last selection the pick-up will come down in position for a 10 inch record and repeat the playing of the record on a 10 inch diameter unless the turntable switch is turned off. Any jamming of the mechanism under these conditions indicates that the records used are not perfectly flat or that their edges are not sufficiently smooth to permit normal operation of the separators in dropping each record in sequence onto the turntable.

2. Do not handle or move manually the pick-up or any part of the mechanism while it is going through the record - changing operation.

3. Do not use force in handling the mechanism at any time.

4. Warped or thick records should not be used for automatic operation.

5. Do not leave records on record holder posts except when needed for immediate operation, as they will warp and sag if left in this manner for a long period of time. Records can be straightened, however, by placing them on a flat surface and resting heavy flat articles, such as books, over them.

6. During automatic operation, the needle is fed automatically into the starting groove of the next record. If the needle fails to ester the starting groove, this is an indication th -t the cabinet is not level. Raise the right hand side of the cabinet, by inserting several thin spacers beneath it on t hat side. If the needle slides over a few grooves, raise the left hand side of the cabinet in a similar manner.

7. Never leave pick-up with needle resting on a record or on the turntable. When finished playing, be sure that the turntable has stopped and the pick-up is in the rest position over needle gauge plate.

Replacements should be made with genuine Emerson parts for best results.



EMERSON PAGE 10-15

Rec d Changer EMERSON IIADIO & PI

Automatic Record Changer

GENERAL INFORMATION Before servicing the automatic record changer, inspect the

assembly to see that all levers, parts, gears, springs, etc. are in good order and are correctly assembled.

A bind or jam in the mechanism can usually be relieved by rotating the turntable in the reverse direction.

The changer can be conveniently rotated through its change cycle by pushing the index lever to "Reject" and revolving the turntable by hand. Six turntable revolutions are required for one change cycle.

The turntable, spindle, and pinion gear are assembled by means of a 3/32 inch straight pin. This pin may be removed by gently driving with a standard pin punch.

If the record changer or cabinet is not perfectly level, normal operation is likely to be affected.

The 10 and 12 inch records must be absolutely flat for smooth operation when using a mixture of the two sizes.

ADJUSTMENTS A. Main Lever.-This lever is basically important in that

it interlinks the various individual mechanisms which control needle landing, tripping, record separation, etc. One adjustment is provided for the main lever. Rotate the turntable until the changer is outofcycle; and adjust rubber bumper bracket (A) so that the roller clears the nose of the cam plate by 1/16 inch

B. Friction Clutch.-The motion of the tone arm toward the center of the record is transmitted to the trip pawl "22" by the trip lever "7" through a friction clutch "5." If the motion of the pickup is abruptly accelerated or becomes irregular due to swinging in the eccentric groove, the trip finger "7" moves the trip pawl "22" into engagement with the pawl on the main gear, and the change cycle is started. Proper adjustment of the friction clutch "5" occurs when movement of t'he tone arm causes positive movement of the trip pawl "22" without tendency of the clutch to slip. The friction should be just enough to prevent slippage, and is adjustable by means of screw "B." If adjustment is too tight, the needle will repeat grooves; if too loose, tripping will not occur at the end of the record.

C. Pickup Lift Cable Screw.-During the record change cycle, lever "16" is actuated by the main lever "15" so as to raise the tone arm clear of the record by means of the pickup lift cable. To adjust pickup for proper elevation, stop the changer "incycle" at the point where pickup is raised to the maximum height above turntable plate, and has not moved outward; at this point 'adjust locknuts "C" to obtain 1 inch spacing between needle point and turntable top surface.

D. & E. Needle Landing on Record.- The relation of coupling between the tone arm vertical shaft and lever "20" determines the landing position of the needle on a 10 inch record. Position of eccentric stud "E" governs the landing of the needle on a 12 inch record; this, however, is dependent on the proper 10 inch adjustment.

To adjust for needle landing, place 10 inch record on turntable; push index lever to reject position and return to the 10 inch position; see that pickup locating lever "17" is tilted fully toward turntable; rotate mechanism through cycle until needle is just ready to land on the record; then see that pin "V" on lever "14" is in contact with "Step T" on lever "17." The correct point of landing is 4.11/16 inches from the nearest side of the turntable spindle; loosen the two screws "D" and adjust horizontal position of tone arm to proper dimension, being careful not to disturb levers "14" and "17". Leave approximately 1/32 inch end play between hub of lever "20" and pickup base bearing, and tighten the blunt nose screw "D"; run mechanism through several cycles as a check, then tighten cone pointed screw "'D".

After adjusting for needle landing on a 10 inch record, place 12 inch record on turntable; push index lever to reject and return to 12 inch position; rotate mechanism through cycle until needle is just ready to land on the .ecord; the correct point of landing is 5-11/16 inches from nearest side of spindle. if the landing is incorrect, turn stud "E" until the eccentric end adjusts lever "14" to give correct needle landing The eccentric end of the stud must always be toward the rear of the motor board, otherwise incorrect land ing may occur with 10 inch records.

F. & G. Record Separating Knife.- The upper plate (knife) "25- on each of the record posts serves to separate the lower record from the stack and to support the remaining records during the change cycle. It is essential that the spacing between the knife and the rotating record shelf "27- be accurately maintained The spacing for the 10 inch record is nominally .055 inch, and for the 12 inch record is .075 inch.

To adjust, rotate the knife to the point of minimum

//DEL BR224A. TONOGRAPII CORPLVDELS AX232 AC,

AX 232 AC -DC

vertical separation from the record shelf and turn screw and locknut "F" to give .052-..058 inch separation. Screw "G" must not be depressed during this adjustment. After setting screw "F" adjust screw "G" so that when its tip is depressed flush with top of record shelf, the vertical spacing between the knife, in its lowest rotational position, and the shelf, is .072-.078 inch.

H. Record Support Shelf.-The record shelf revolves during the change cycle to allow the lower record to drop onto the turntable. Both posts are rotated simultaneously by a gear and rack coupled to the main lever "15," and it is

necessary that adjustments be such that the record is released from both shelves at the same instant. To adjust, place a 12

inch record on the turntable, rotate mechanism into cycle to the point where tone arm is at maximum distance outward from turntable; lift record upward until it is in contact with both separating knives, then loosen screws "H" and shift record shelves so that the curved inner edges of the shelves are uniformly spaced at least 1/16 inch from record edge. Tighten the blunt nose screw "H," run mechanism through cycle several times to check action, then tighten cone pointed screw "H".

!f record shelves or knives are bent, or not perfectly horizontal, improper operation and jamming of mechanism will occur.

J. Tone Arm Rest Support (not shown).-When the changer is outofcycle, the front lower edge of the pickup head should be 5/16 inch above surface of motor board. This may be adjusted by bending the tone arm support bracket, which is associated with the tone arm mounting base,

in the required direction. K. Trip Pawl Stop Pin.-The position of the trip pawl

stop pin "K" in relation to the main lever "15" governs the point at which the roller enters the cam. By bending the pin support either toward or away from trip pawl bearing stud, the roller can be made to enter the cam later or earlier, respectively. This adjustment should be made so that the roller definitely clears the cam outer guide as well as the nose of the cam plate,

Lubrication.-Petrolatum or petroleum jelly should be applied to cam, main gear, spindle pinion gear, and gears of record posts.

Light machine oil should be used in the tone arm vertical bearing, record post bearings, and all other bearings of various levers on underside of motor board.

The felt washer between the turntable and spindle bearing should be soaked in light engine oil whenever the turntable is removed, or as required for proper operation.

Do not allow oil or grease to come in contact with, rubber mounting of tone arm base, rubber bumper, or flexible coupling of drive motor.

MISCELLANEOUS SERVICE HINTS Incorrect adjustment of a particular mechanism of the

changer is generally exhibited in a specific mode of improper operation. The following relations between effects on operation and the usual misadjustments will enable ready adjustment in most cases.

1. For any irregularity of operation, the adjustment of the main lever "15" should be checked first as in "A".

2. Needle does not land properly on both 10 and 12 inch records-Make complete adjustments "D" and "E".

3. Needle does not land properly on 12 inch record but correct on 10 inch-Effect adjustment "E".

4. Failure to trip at end of record-Increase clutch "5" friction by means of screw "B". Also, see that levers "7" and "12" are free to move without touching each other.

5. Pickup strikes lower record of stack or drags across top record on turntable-Adjust lift cable per adjustment

6. Needle does not track after landing-Friction clutch "5" adjustment "B" may be too tight; bind in tone arm vertical bearing; levers "7" and "12" fouled; or pickup output cable twisted.

7 Cycle commences before record is complete-Record is defective, or adjustment "B" of friction clutch "'5" is too tight.

8. Wow in record reproduction-Record is defective; flexible coupling between motor and changer mechanism not correctly assembled; or instrument is not being operated at normal room temperature (65° F)

9 Record knives strike edge of records-Records warped; record edges are rough; or knife adjustments "F" and "G" are incorrect.

10 Record not released properly --Adjust record shelf as- semblies i respect to shaft by means of adjustment

11 Needle lands in 10 inch position on 12 inch record or misses record when playing both types mixed-Increase tension of pickup locating lever spring "30"



PAGE 10-16 EMERSON

MJDEL BR224A EMERSON RADIO & PHONOGRAPH CORP. MODELS AX232 AC,AX232 AC-DC Record Changer ,Diagrams ,Notes

Bottom View of Automatic Record Changer

AUTOMATIC RECORD CHANGER

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EMERSON PAGE 10-17 rrIJDEL AX240

0005s C3MF

TI

EMERSON RADIO & PHONOGRAPH CORP.

Five -Tube, A.C. - D.C., Superheterodyne Receiver

I.F. PEAKED AT 455 KC

CI

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Chassis AX Schematic,Voltage Alignment,Changos

Voltage rating 105-125 volts Power consumption 45 watts Frequency range 540 to 1730 kc.

6A8 ., 6K7 6Q7

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PRODUCTION CHANGE

HEATERS

5 TUBE AC -DC RECEIVER

SCHEMATIC DIAGRAM FOR MODEL AX -240 (See Production Change, No. 1)

VOLTAGE ANALYSIS

Location of Coils and Trimmer Adjustments The first i-! transformer is mounted on top of the chassis deck beside the speaker. The trimmers are accessible

through holes in the top of the can.



The 455 kc wave -trap is mounted on the same form as the antenna coil directly behind the speaker. The trimmer for the 455 kc wave -trap is mounted on the coil and is accessible from the rear of the chassis. The oscillator coil is lo

cai underneath the chassis, beneath the first i -f transformer.

u -f and Wave -Trap Alignment Swing the variable condenser to the maximum capacity position. Feed 455 kc to the grid -cap of the 6A8 tube

through a .01 mf condenser and adjust the four i -f trimmers for maximum response. Feed 455 kc through a .0001 mf

condenser to the antenna lead and adjust the wave -trap for minimum response. (See General Notes, paragraph No. 7.)

R -f Alignment Set the dial pointer at 140. Feed 1400 kc through a .0001 mf condenser to the antenna lead sand adjust first the

oscillator trimmer (on rear section of variable condenser) then the antenna trimmer (on front section of variable con-

denser) for maximum response.



PAGE 10-18 EMERSON 1tUDEIS CH243,CH246,CH256 Chassis CH EMERSON RADIO & PHONOGRAPH CORP. Schematic ,Voltage Alignment

YoaDsc Five -Tube, A.C. - D.C., Superheterodyne Receiver

M F CI8 00022

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FIELD

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MODELS CH -243, CH -246 and CH -256

.02.5 25L6GT 191F


IF PEAK 455 AC

CHASSIS MODEL ,CH

Voltage rating 105-125 volts, a.c. or d.c. Power consumption 45 watts Frequency range 540 to 1780 kc.

VOLTAGE ANALYSIS

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Voltage at 25Z6 cathode -125 volts. Voltage across speaker field -28 volta. ÿ e C.

ADJUSTMENTS ;71 g

An oscillator with frequencies of 455 and 1400 kc is required. á An output meter should be used across the voice coil or output transformer for observing maximum response. y y



The first i -f transformer is mounted on top of the chassis deck beside the speaker. The trimmers are accessible through holes in the top of the can.

Thé second i -f transformer is mounted underneath the chassis beneath the variable condenser. The trimmers are accessible through holes in the top of the chassis directly beneath the variable condenser.


The 455 kc wave -trap is mounted on the same form as the antenna coil directly behind the speaker. The trimmer for the 455 kc wave -trap is mounted on the coil and is accessible from the rear of the'chassis. The oscillator coil is located underneath the chassis, beneath the first i -f transformer.

1-f and Wave -Trap Alignment

Swing the variable condenser to the maximum capacity position. Feed 455 kc to the grid -cap of the 6A8 tube through a .01 mf condenser and adjust the four i -f trimmers for maximum response. Feed 455 kc through a .0001 mf condenser to the antenna lead and adjust the wave -trap for minimum response. (See General Notes, paragraph No. 7.)

R -f Alignment

Set the dial pointer at 140. Feed 1400 kc through a .0001 mf condenser to the antenna lead and adjust first the oscillator trimmer (on rear section of variable condenser) then the antenna trimmer (on front section of variable condenser) for maximum response.

.a

I I III ÿ 0

©John F. Rider. Publisher


EMERSON PAGE 10-19

6K7

ce

TC7

(,F PEAKED AT 455 KF.

WAVE BAND SWITCH SHOWN IN BROADCAST POSITION. POSITION NO.1 SNORT WAVE

NO2 POLICE NO.3 BROADCAST

SCHEMATIC DIAGRAM

MODEL CB243 EMERSON RADIO & PHONOGRAPH CORPchassis CB

Sohematio,Voltage Notes

TO A.0 LINE

WAVE BAND INDICATOR

RIO

DIAL LWHT

Voltage rating

GENERAL NOTES

1. The receiver should never be turned on with either the speaker plug or the 6AC5G tube out of their respective sock-

ets, since the rapid rise in rectifier voltage will damage the electrolytic condenser.

2. When replacing the chassis in the cabinet take precautions to keep any part of the dial and condenser assembly from

touching the cabinet, otherwise microphonism will result.

3. The color coding of the i'f transformers is se follows: Grid-green Grid return-black B plus-red Plate-blue.

4. The color coding of the power transformer is as follows: Primary-two black leads High -voltage secondary-two red leads High -voltage secondary center tap-red and yellow lead 6.3 volt secondary-two green leads 6 volt secondary-two yellow leads.

5. The adjustable padding condensers for the broadcast and police bands are mounted on the rear chassis wall with the

screw adjustment accessible through holes in the rear of the chassis. The short-wave band has a fixed padder, C10

on schematic. When replacing this fixed padder be careful to use s condenser which has a capacity within 2% of the

specified value, otherwise the short-wave coils may not track.

6. An efficient antenna system is necessary to enable a full realization of the merits of the receiver. For reduction of

roise and achievement of high.efficiency on all frequency ranges the Emerson All -Wave High -Fidelity Antenna, Model

W-78, and the Emerson All -Wave Antenna System, Model W-80, are recommended. Instructions for the installation

of these antennas are supplied with each kit. In congested areas where the installation of a large antenna is not desirable we recommend the use of the

Emerson Flexible Mast Antenna, Model W-82. Instructions for the installation of this compact and efficient antenna

are supplied with each kit.

6K7 Ts - 6Q7G

R7 SHORTING] RIO LINK

TO ALL HEATERS

SERIAL NOS

76 SACS O 0321 T


FOUR POSITION TONE CONTROL SHOWN IN MAK. BASS POSITION.

VIEW OF SWITCH LOOKING AT REAR.

SPEAKER FIELD

T MOO mi C3R

1R RI7

IB

C39

TRANSFORMER FIEL

ANCHORAGE COLE

SPEAKER PLUG LOOKING AT

PINS. SEE ENCIRCLED NUMBERS ON SCHEMATIC FOR CONNECTIONS.

MODEL CB -243

105-125 volta, 60 cycle, a.c. (unless otherwise specified) Power consumption 60 watts Frequency ranges 640 to 1800 ke, 1800 to 6250 kc

and 5.8 to 22 megacycles

VOLTAGE ANALYSIS Readings should be taken with a 1000 ohms -per -volt meter. Voltages listed below are from point indicated to ground

(chassis) with the volume control turned on full and no signal. Line voltage for these readings was 110 volts, 60 cycles, a.c. All readings except B plus at rectifier, heaters, and cathode voltages were taken on 250 volt scale.

Tube Plate Screen Cathode Ose. Plate Fil. 6K7 (r -f) 170 85 0 6.3 a.c. 6K8 206 85 0 77 6.3 a.c. áK7 (i -f) 206 85 0 - 6.3 a.c. 6Q70 100 - o - 6.3 a.c. 76 206 - 10.3 - 6.3 a.c. 6AC5G 195 - 0 - 6.3 a.c.

Voltage at 80 filament to B minus (center tap on high voltage winding) -300 volts. Voltage across speaker field -86 volts. The grid bias for all tubes is developed across resistors R17 and R18. This voltage should measure 10.8 volts.

p4WA4qc7dPó

Y FF mm



'AGE 10-20 EMERSON btIDEL CB243 Alignment,Socket EMERSON RADIO & PHONOGRAPH CORP. Trimmers ,Parts

Item Peet No. DESCRIPTION

T1 4BT-396 Three -band antenna coil T2 4BT-397 Three -band interatage coil T3 5RT-447 Three -band oscillator coil T4 42T -425A 455 kc first i -f transformer T6 3RT-321C 455 kc second i -f transformer T6 65T-451 Rl LR -64 R2 LR -60 113, R5, R21 KR -63 R4, R14 KR -67 R6, R8 3LR-266 R7 3BR-246 R9, R12 HR -42 R10 3XR-277 R11, R18 KR -66 R16 GR -31 R16 4ZR-326 R17 6BR-344 R18 4CR-320 R19 3RR-276 R20 6BR-346

LEN P.s<, Ó.. Ratcd. r eI 8229222222 tÿ, Oct. 16th, 1938 .

Power transformer, 117.5 V, 60-60 cycle (See note below) 6000 ohm I/ watt carbon resistor 20,000 ohm I/ watt carbon resistor -

50,000 ohm I4 watt carbon resistor 1 megohm %4 watt carbon resistor 40,000 ohm %2 watt carbon resistor 10,000 ohm 2 watt carbon resistor 2 megohm IA watt carbon resistor Volume control 500,000 ohm, with line switch 260,000 ohm 1 watt carbon resistor 20,000 ohm i watt carbon resistor 3 ohm %2 watt wire wound resistor 146 ohm 1 watt metallized resistor 35 ohm I/o watt wire wound resistor 10 megohm % watt carbon resistor 5000 ohm % watt carbon resistor

IOCATION OF TRIMMFRS FIGURES SNOW FREQUENCIES AT W1101 EACH BAND IS ALIGNED. READ 'ALIGNMENT PROCEDURE.

SHORT WAVE -DO MC

POLICE- 6 MC---- BROADCAST -1600 KC.

VEW LOOKING AT TOP OF CITASSI$ BLUE qy

VEW LOOKING BLA

AT BACK OF CHASSIS" SHORTWAVE -20 MC.

POLICE - 6 NC. BROADCAST -1600 KC

VARIABLE

IST 1F.

-- SHORT WAVE - 20 MC SHORT WAVE '6 M

BROADCAST - 1600 KC

INSTABE COIL 76

o 2N0. IF

TRANSFORMER

BO

OSCILLATOR COIL

BROADCAST KC

E B POLK B MC

PHONOGRAPH TERMINAL

SERIAL NO .S

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EMERSON PAGE 10-21

-3 Ti

MOEL BT245 EMERSON RADIO & PHONOGRAPH CORPChassis BT

Sehemßtic,Voltage Alignment,Pleuets

Voltage rating 106-126 volts, a.c. or d.e. Frègseecy range 610 to 1960 Iq Power coneomptlon 45 watt..

IF PEAKED AT 455 K.0 l F1

6A7 T3 606 T4 6Q7G X17 25L6G

MODEL RT -245 CHASSIS MODEL BT

CI

AC DC LWE üJ---e UNE SWITCH ON

VOLUME CONTROL

VIEW LOOKING AT PINS Oc BALLAST RESISTOR, WHICH HAS AN

OLTAAG ME

OVERALL

TUBE DATA AT DROP 19V. AT.3 VOLTAGE DROP ACROSS PILOT `fer LIGHT IS 4 VOLTS. tr;'7- _ HEATERS

The tube complement ó u follow.: KEY

1-6A7. pestagri oaefla6timoduLóc. 1-6DI ut 1-f amples. 1 Gr

lodiode detector, u -f ampli-, s.v.e.

1-267.66, beam power output 1-2626, dual h.Y-wave rectifier.

All octal -base tuba are replaceable with either metal or equivalent octal -base glass tobee. The letter "G" at the end of the tube number indicator that the tube has a glue envelope. In all other respect. it is exactly the same se the metal tube bearing the same number without the "G..

CIB

m . e

ß s ; 2 i

Si

i

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I $b j$ R a

W .°.

Z. 1 3I , 'D 8 9 7

_e ` â N y . .á ñ v. ]3 i 33 > ë

8é vt 6 90 3 ° 3 i Z É, 3 . y =

Ti W ó e ' .i. : ` 2 9 ..

w p,N á_ 9é $

s 39 a P ' $ °p

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S i" .

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E e p m

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gó

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Fl .4 w m J çS Y fi

TC21

25Z5 25L6G 608 617 6070

PILOT LIGHT CHASSIS MODEL BT


9, OUTPUT

TRAN6FORMER ON SPEAKER

gp

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1

9B

$ 88ti a8111 1ib+

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1. > E

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11 "ó.,

; % $B m é "É9

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34 1'3 s t e á » »

REPLACEMENT PARTS LIST

IL me r: y .i. ir. .. - J B P R foot. r rm. .mar~muv/

2I E e$ Tas Pre No. DESCRIPTION Prim

Ya Ll, Tl 6YT444 Antenna coil with adjuteble 455 ke wave -trap 6.90 $$ , T2 4XT-458 Oscillator coil .35

e fi g

Tt. ITT -463 Double -tuned 455 kc lret i -f transformer .90

s¡ 9ÿ T4 CET -486A Double -tuned 455 ke second i -f transformer .60 Ni ß rxUP $y B1 ZZR-196 30,000 ohm %watt carbon reaLtor .16 G

° 362 KR -OS 50,000 ohm V. watt carbon resister .16

ia6 yy

i' RS 8 %FR-298 140 ohm watt wire -wound resistor 16 3 id 5

B R4 ER -57 1 megohm V. watt carbon resistor .16

2 il. J Él

Rb 2NR-214 Volume control .26 megohm with line switch 1.20

e E E RB 4X36.827 16 megohm % watt carbon reamtor 16

.0 B . R7 KR -I6 250,000 ohm I watt carbon resistor .16

w 9 É e: RA KR -66 500,000 ohm %4 watt carbon resóór 10

. II L49BG Plug-in ballast resistor. (Interchangeable with L -49B) .55

e- °i

° variable E: Cl, CZ 6TC423 Two -gang condenser 2.40 '1 'de CS 4XC-401 0.00066 mf mica eonduer 20

iRi 9 C4 Trimmer, part of wave -trap amicably.

ea CI, C11 Trimmers, part of vaitable condenser.

S..§ t.1 CO, Cl. C8, C9 Trimmer., part of l -f traneformen.

E c Cil BC -12 0.06 caf, 200 volt tubular condenser. .20

.M ° É ° C13 AC -6 0.1 mf, 200 volt tubular condenser .20

q j7 C12, C14 LC -64 0.05 mf, 400 volt tubular condenser .20

3`C g °s

C15, CIS 4XC-394A 0.00022 caf mica condenar .20

$ a o

C16 SHC-274 0.002 mf, 600 volt tubular condenser... .20 . ¡Ill C17 LC -66 0.02 mf, 400 volt tubular eondoneer. _ 20

J:1 $ g C19 3FC-MS 0.025 ont, 400 volt tubular condenser .20

çg

8 C20, C21 4HC-3481) Dual 20 caf, 160 volt dry electrolytic condenar .90

83 ó .,S

3S2678 5" dynamic speaker gg

Q- 4.45

$ C 9oÄ 4DS-264A Tone control .witch .25

8'4' $ p 4BL-94 Pilot light, 6.3 volt, .25 amp., Maeda No. 44 .20

-.ell y áóy = ' E 6 STD -68 Dial face .20

8.y 3b.. 3X2484 Delve nod AL

m ' i °°g2

` R ' 362-519 Drive cord spring .02

l 4UZ-700A Dial pointer .16

OX 4UZ-842 Dial crystal .10



PAGE 10-22 EMERSON NADELS CL246,CL253 CL256 Chassis CL Schematic,Voltage Alignment,Data PRODUCTION CHANGE

yCL chassis which use oscillator coil 6JT-466 or 4XT-458 may use 6JT-466A for replacement. nections see illustration,

C3.00055mF C18 OOO TI I

MFF PEAKED AT 455 K.D. F 12A8GT T2 I2K7GT T3 12Q7GT CIT 35L6GT

AC UNE

.OR Ifh DC L

LINE SWITCH ° ON VOLUME C12 CONTROL

.1

R9

PILOT LIGHT

ViEW LOOKING AT BOTTOM OF CHASSIS SHOWING LEADS TO OSCILLATOR COILS

VARIABLE CONDENSER +

r- (D

I- o -D tEt LO äw

k uni V 0180 a01V-n0 so 1

o u 801'21-110S0

Location of Coils and Trimmer Adjustments The first i -f transformer is mounted on top of the chassis

through holes in the top of the can.

35Z4GT

70 "- \AAw

RIO

SPEAKER FIELD

MOUNTING FOOT IS GROUND CONNECTION FOR ALL COILS

Pá QJ ja J

ó

.5;

+ m

a3SN3ON00 31BVINVA

For correct lug con

.o:Y MF el

-a M

o o d

O W

TRANSFORMER á XI ON SPEAKER o

M

o r. r. °000

Cxcv4N CV N CV CO L` ti ti CO M

deck beside the speaker. The trimmers are accessible



The 455 kc wave -trap is mounted on the same form as the antenna coil directly behind the speaker. The trimmer for the 455 kc wave -trap is mounted on the .coil and is accessible from the rear of the chassis. The oscillator coil is located underneath the chassis, beneath the first i -f transformer. l -f and Wave -Trap Alignment

Swing the variable condenser to the maximum capacity position. Feed 455 ice to the grid -cap of the 12A8 tube through a .01 mf conde ser and adjust the four i -f trimmers for maximum response. Feed 455 kc through a .0001 mf condenser to the antenna lead and adjust the wave -trap for minimum response. (See General Notes, paragraph No. 5.)

R -f Alignment

Set the dial pointer at 140. Feed 1400 kc through a .0001 mf condenser to the antenna lead and adjust first the oscillator trimmer (on rear section of variable condenser) then the antenna trimmer (on front section of variable condenser) for maximum response. VOLTAGE ANALYSIS

Readings should be taken with a 1000 ohms -per -volt meter. Voltages listed below are from point indicated to B minus with the volume control turned on full and no signal. Line voltage for these readings was 117.5 volts, 60 cycles, a.c. All readings except heaters and cathodes were taken on 250 volt scale. Measurements made with 117.6 volts d.c. will be lower than those given below.

Tube Plate Screen Cathode Oec. Plate Fil. 12A8 94 50 0 94 12 12K7 94 94 0 - 12 12Q7 40 - 0 12 35L6 87 94 5.2 85

Voltage at 35Z4 cathode -121 volts. Voltage across speaker field -27 volts.

Voltage across pilot light section of ballast resistor (R9)-S.5. Voltage drop across entire ballast resistor (R9 and R10)-13.5.



EMERSON PAGE 10-23 NADEL CF255

YDS

EMERSON RADIO .0 PHONOGRAPH CORP. r -f amplifier and grid leak detector

I2B8GT

CI

RI

MVyVVV\,is

TO A.C. OR O.C. UNE

2

z

á

s

II 17

2 C9

R4

beam power single half -wave

32L7GT

R3

R

Chassis CF

output and Scherls.tio,Voltage rectifier A l i gnment, Par ts

ar _o ' V

ail, f, ao° T9 3

-

.°{

> aá

to 0 co

w .g

R8 - In a o ó Ito

` I2

R7 R8

LINE CORD

MODEL CF -255 CHASSIS MODEL CF

32176T I2B8GT

HEATERS

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PILOT UGHT

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PAGE 10-24 EMERSON IDDELS CM260,C14266 C1267 Early,Late EMERSON RADIO Chassis CM.

Above and Below Serial 2690200

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PRODUCTION CHANGES

Schematics PHONOGRAPH CORP. voltage

Alignment,Changes Parts list

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I. Chasaia bearing serial numbers below 2,690,200 use R7-260,000 ohm % watt carbon resistor.

2. Resistor R9-RI0, part no. 6JR-353, is not used on chassie bearing serial numbers above 2,690,200.

a r Voltage rating ... 106126 volta, a .c. or d.e.

Power consumption .. 80 watts. Per

F Frequency range .... 640 W 1600 he. .

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EMERSON PAGE 10-2.5

Schematic ,Voltage Batt.Viiring,Changes EMERSON RADIO & PHONOGRAPH CORP.

01 Eul L2

ANTENNA

6

RMINAL STRIP FOR OUTSIDE ANTENNA LE. PEAKED AT 455 K.C.

=C7 M//V

RU

THREE BATTERY PLUGS

IN5G T4

C12 q

DOUBLE POLE BATTERYQ SWITCH ON VOLUME CONTROL

II -15G

ALL FILAMENTS

TUBE DATA ...1 ""°°"°º5°IP° w GE ,) --

The tube complement is as follows:

1-1A7G, oscillator -modulator 1-1N5G, 1st i -f amplifier 1-1N5G, 2nd i -f amplifier 1-1H5G, 2nd detector, a.v.c., a -f amplifier 1-1C5G, pentode output

Five -Tube Battery- Operated Superheterodyne

-TO `B" BATTERIES

MODELS CE -259 and CE -260 CHASSIS MODEL CE

Current drain .... "A" battery -0.3 amps. "B" battery -0.010 amps. with no signal

Frequency range 540 to 1730 kc on early Model CE -259 530 to 1600 kc on all Model CE -260

and later Model CE -259

z

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TO BATTERY

UD 00 0G te IG CT;

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Cl O CV Un N . 000-00GVN a

CIS

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MODELS CE259,CE260 Chassis CE

C19

I PM

SPEAKER

Ó

OUTPUT TRANSFORMER

ON SPEAKER

RN B WIIIN AAA BAN SOWN Inds IN O I. IONN Me eu FP..4M.

C20

1F; roro SWITCH

BLUE

COMBINE BATTERY PLUG A-1.5 VOLTS VIEW LOOKING AT B-90 VOLTS m..á ,n CE ºsa

Le b

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()John F. Rider, Publisher


PAGE 10-26 EMERSON MDDEIS CE259,CE260 Chassis CE EMERSON RADIO & PHONOGRAPH CORI'. Socket, Tr inner s Alignment, Parts

MODELS CE -259 AND CE -260

GENERAL NOTES

1. Batteries: The Models CE -269 and CE -260 are designed to house the complete set of batteries within the cabinet. N2' The battery complement should be as follows:

°' 1

00

FOR MODEL CE -259 (Portable) "'

Type Battery No. Req. Eveready Part No. Rayo -vas Part No. Z6

PA volt "A' 1 742 (plug-in type) P -94A (plug-in type) 46 volt "B" 2 762 (plug-in type) P-6303 (plug-in type)

FOR MODEL CE -260 c

m Combined (Aleo Burgess "A" and "B" Pack 1 748 (plug-in type) AB82 (plug-in type) No. 17G -D60) ó z

2. The color coding of the i -f transformer leads is as follows:

Grid-green Plate-blue Grid return-black B plus-red

°

W

t c

F

s c

B. The color coding of the battery cable is as follows:

Red-B plus, 90 volts Yellow-A plus, 1.6 volte N

só

Blue-B minus Black-A minus G C W

8 E

4. If replacements are made in the r -f section of the circuit, the receiver should be carefully re -aligned. S

6. Models CE -259 and CE -260 have self-contained antennas and do not require additional antenna or ground connections. c 5 3. 0 For permanent home installations of either model, however, if it is desired to improve rece tioni of weak stations, u .0 .o an additional outdoor antenna should be used. For this purpose a terminal strip ls provided in the cabinet for ° E antenna and ground connections. (See diagram on next page.)

.9. c 2 'C

6. The self-contained Imp antenna operates at maximum efficiency when its position is at right angles to the broadcast- ÿ á, é ó ing source. It is important, therefore, once the station is tuned in rotate the cabinet back and forth through a

m N v quarter of a circle (90 degrees), leaving it at the position where the station is received with maximum volume. This c - procedure is not necessary for receivers with outside antennas.

ADJUSTMENTS

An oscillator with frequencies of 465 and 1400 kc is required. An output meter should be used across the voice coil or output transformer for observing maximum response.



The oscillator coil is located beneath the chassis. The trimmer for the oscillator is on the rear section of the variable condenser.

The loop antenna acts as the antenna coil. The trimmer fer the loop, when provided, is on the front section of the variable condenser.

(See Production Change No. 3)

l -f Alignment Model CE -269 (below serial number 2,319,-

650). Swing variable condenser to maximum capacity position.

Model CE -259 (above serial number 2,319,- 650) and CE -260. Swing variable condenser to minimum capacity position.

Feed 455 he to the grid of the 1A7G tube through a 0.01 mf condenser. Adjust the four i -f trimmers for maximum response.

R -f Alignment Set the dial pointer at 140. Feed 1400 kc

through a .0001 mf condenser to the antenna connection and adjust first the oscillator trimmer (on rear section of variable condenser) then the antenna trimmer (on front section of variable condenser) for maximum response.

Battery Installation for Model CE -259 (See diagram on inside page)

To install and connect the batteries in the portable cabinet observe the following procedure: 1. Open the end side of the cabinet (side with

speaker grille) by removing the two wood screws in the top corners of the panel. The panel is hinged at the bottom. Open the panel by pulling the small leather tab at the top edge.

2. A small wood cleat is fastened te the bottom of the cabinet directly below the two large wood rails. Remove this cleat by tak- ing out the small wood screws.

3. The three -prong plugs on the battery cable from the receiver should be plugged into the two "B" batteries. 4. Slide the "B" batteries, one at a time, in an upright position between the two wood rails in the cabinet, as indicated

in the diagram. 6. Replace the small wood cleat in front of the second battery and fasten it securely with the wood screws.

6. The small two -prong plug in the battery cable should be plugged into the "A" battery. Place the "A" battery in the front corner of the cabinet, as shown in the diagram.

7. Be eure that all of the cable wires are free and clear of the receiver. Care should be taken also to keep the wires from jamming between the wood rails and the batteries.

8. Close the end panel and replace the wood 'crews, fastening them securely.

Battery Installation for Model CE -260

The cabinet for this model is designed to house completely the combined "A" and "B" pack. Place the battery pack in the cabinet at the rear of the receiver and insert the four -prong plug of the battery cable into the socket on the top of the battery.

If it is desired to use separate "A" and "B" plug-in type batteries, a special cable harness is available for connect- ing the batteries together. The receiver battery cable then may be plugged into the socket on the special cable harness.

When ordering replacemént parts specify part numbers.

é w

ió $

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PRIMA e c,e olooE I r

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MODEL CE 259 (Qom z,;lº,s

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LOCATION OF TUBES AND TRIMMING CONDENSERS

MODELS CE -269 AND CE -260

(See Production Change No. 3)

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EMERSON PAGE 10-27

MODELS CR261,CR262

TR'rynE 12A8GT

T'_.(1

EMERSON RA1)IO & PHONOGRAPH CORP. CR274 Chassis CR Schematic,Voltage Notes,Alignment

oozy 5OL6GT Yao

If PEAKED AT 455 K.C.

T2f/ 12K7GT T3

Iào , o a

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LINE SWITC ON VOLUME CONTROL

NQIa

.//yF 1 2 00 .

II --1

35Z5GT

:OSMf HEATERS yoo v.

SPEAKER FIELD

bó0r, 450 OHMS

`9owss T /SW E[s'CrT

IF PEAK 455 KC

4 PILOT LIGHT

MODELS CR -261, CR -262 and CR -274 CHASSIS MODEL CR

ALIGNMENT AND LOCATION OF TRIMMERS IF. 455ko through .01 mf. cord. to grid of 12A8G

let IF, top of chassis right of speakerj2rd IF under chassis beneath variable, holes provided it

top of ohaesis.-Variable max. cap. Adjust trimmers to max. reeponse. Wave Trap(,see GENERAT, NOTES) Feed 455kc through .0001 mf. oond. to ant, lead. Adjust for minimum

response. RF. Dial at 140. Feed 1400kc through .0001 mf. cond.

to ant. lead. Adjust oso. trimmer(rear section of

variable), then ant. trimmer (front section of var-

iable) for maximum response.


Voltage rating 105-125 volts, a.c. or d.c. Power consumption 30 watts. Frequency range 540 to 1730 kc.

GENERAL NOTES

NO.2B

6JT-467A 6RT-476

OSCILLATOR VARIABLE PLATE CONDENSER

p Mounting toot

CHASSIS CHASSIS

MOUNTING FOOT IS GROUND CONNECTION FOR BOTH COLS

CR chassis may use either oscillator coil

VIEW LOOKING AT LUG END OF COILS SHOWING LEADS TO OSCILLATOR COILS

1. If replacements are made or the wiring disturbed in the r -f section of the circuit, the receiver should be carefully re -aligned.

2. In operating the receiver on d.c. it may be necessary to reverse the line plug for correct polarity.

3. The colo^ coding of the i -f transformer leads is as follows: Grid-green Plate-blue Grid return-black B plus-red

4. The wave -trap in the receiver has been adjusted for maximum signal rejection at 455 kc. If, however, persistent interference is experienced from some particular telegraphic station, readjust the wave -trap trimmer until. the response from the interfering station is at a minimum.

VOLTAGE ANALYSIS

Readings should be taken with a 1000 ohms -per -volt meter. Voltages listed below are from point indicated to B minus (switch) with the volume control turned on full and no signal. Line voltage for these readings was 117.5 volts, 60 cycles, a.c. All readings except heaters and cathodes were taken on 250 volt scale. Measurements made with 117.5 volts d.c. will be lower than those given below.

Tube Plate Screen Cathode Ose. Plate Fil. 12A8GT 88 45 0 88 12 12K7GT 88 88 0 - 12

12SQ7GT 40 - 0 - 12 50L6GT 82 88 5.7 - 50

Voltage at 35Z5 cathode -115 volts. Voltage across speaker field -27 volts. Voltage across pilot light -4.5 volts.



l'AGE 10-28 EMERSON IIDDEL CT275 Chassis CT Schen.tic,Voltage Alignment

TERMINALS FOR OUTSIDE ANTENNA

o.,

LOOP ANTENNA

= .05 MF

EMERSON RADIO & PIIONOGRAPII CORP. Current drain ..

Frequency range

"A" battery -0.3 amps. "B" battery -0.010 amps. with no signal 530 to 1600 kc

I.F PEAKED AT 455 K.C.

IA7G 13/ IN50 Ur' O lo

o) (:3- of !OM

R2

.02 = MF

/00/A7 -a- OTp$ MF

1A7G, oscillator -modulator. 1N5G, 1st i -f amplifier. 1N5G, 2nd i -f amplifier. 1H5G, 2nd detector, a.v.c., a -f amplifier 1Q5G, beam power output.

Batteries: The Model CT -275 is design The battery complement should be as

Type Battery 1h volt "A" 45 volt "B"

No. Reg. 1

2

The color coding of the i -f transformer Grid-green Grid return-black

The color coding of the battery cable is as follows: Red-B plus, 90 volts Yellow-A plus, Blue-B minus Black-A minus

0002 ' CIA AlF IN5G

O2 NF \T4 IHSG ¡¡ IQ50

C12 0 L13

;EAG _

RII

2MEG tV /Vk/

04 DOUBLE POLE BATTERY SWITCH ON VOLUME CONTROL

THREE BATTERY PWGS YI.. No1N, or row,

ALL FILAMENTS X

/ TO'A' TO 'le BATTERIES (BATTERY

Thee -prong plugs Inserted in two 'B'butterles.

-RKTENNA

e e

VIEW LOOKING AT BACK, SHOWING EXTERNAL ANTENNA

.ANO GROUND CONNECTIONS. (with bock in place)

MODEL CT -275 CUT -AWAY VIEW SHOWNG BATTERY LOCATIONS AND WRE CONNECTIONS

ed to house the complete set of batteries within the cabinet. follows:

Eveready Part No.

741 (plu

762ype) (plug-in type)

leads is as follows:

Rayovac Burger Part No. Patt No.

8F (plug-in type)

P-5303 B30 -P1 (plug-in type) (plug-in type)

Plate-blue B plus-red

Oo3 MF

OUTPUT rRAMSrt1nMER

ON SIMMER

á o > NOoNWC - d oOmt,00NL

» 0.

! td

d

m o E1Ii ÿ G t;

:D o U

N 2

> 1.5 volts Location of Coils and Trimmer Adjustments

The i -f transformers are located in cans mounted on top of the chassis. The first i -f transformer is the one between the speaker and the variable condenser. The diode i -f transformer is the one behind the speaker. The trimming condensers for both transformers can be reached through holes in the tops of the cans.

The oscillator coil is located beneath the chassis. The trimmer for the oscillator is on the rear section of the variable condenser. l -f Alignment

Swing variable condenser to minimum capacity position.

Feed 455 kc to the grid of the 1A7G tube through a 0.01 mf condenser. Adjust the four i -f trimmers for maximum response.

R -f Alignment Set the dial pointer at 140. Feed 1400 kc through a .0001 mf condenser to the antenna connection and adjust the oscillator trimmer (on rear section of variable condenser) for maximum response. No alignment necessary on antenna circuit



FADA PAGE 10-1

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FADA RADIO & ELECTRIC CO

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)John F. Rider, Publisher


FADA PAGE 10-3

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PAGE 10-4 FADA MODEL 6A65 Schematic ,Voltage Alignment,Socket Trimmers


THESE RF6ADINGS TAKEN WITH LINE VQ.TAGS 120 A. C.

Plate Screen C..thode Anode

GA8G 258 70 4. 150 696 258 70 2. 6Q7G 150 - 1.9 6V6G 250 258 11.4 80 630 A.C.PLATE TO PLATE -330 D.C.F11to Ground 76 250 - 19.

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PAGE 10-6 FADA

MODEL 6A80 Alignit nt MODELS 366,366PT Flash-O-Liatic Data


FADA FLASH-O-MATIC SIX

INTRODUCTION: FADA Flash-o-Matic Six is an electrical type automatic tuning system that, once adjusted, will automatically "tune in" any one of six local broadcast stations operating between 540 and 1500 kilocycles (K. C.). While the Flash-o-Matic is not confined to local reception, it should be adjusted for stations affording the best reception and most frequently "tuned in."

U,11:\I\t: PRIM:Etti lIE: It is advisable that the receiver remain in

operation for fifteen minutes or more before attempting any adjustments. Now that the receiver has reached constant temperature the following adjustments are to be made +o the trimmer condenser set screws located on the Flash-o-Matic tuning panel a+ the rear of the receiver.

(a) Select six local broadcast stations whose programs are preferred; then,

detach the station call letters from the station call letter tab sheets,

which are supplied with each receiver.

(b) The six Hash-o-Matic positions are numbered and arranged according to frequency limits.

There are number tabs (I to 6) in the Flash-o-Matic escutcheon as shipped from the factory. These tabs show the relation between the Flash-o-Matic escutcheon and the Hash-o-Matic tuning panel positions and are to be removed, one at a time (with the aid of a pin) when inserting the station call letters.

The sii call letter tabs corresponding to the six broadcast stations which have been chosen, must be arranged in the Flash-o-Matic escutcheon so

that the frequency in kilocycles of each station will fall within the frequency limits of the proper group. If one of the chosen stations has an operating frequency of 550 K.C., it should be placed in the No. I (530 to 710 K.C.) group, a station of 600 K.C. should be placed in the No. 2 group, etc.

Each group has considerable overlap to allow for the selection of six

stations which may have frequency assignments comparatively close together.

Having inserted the call letter tabs, cover each tab with a celluloid disc furnished with your receiver.

(c) Two trimmer condenser set screws are provided for each one of the six

station positions and are accessible at the rear of the receiver. All trimmer condenser set screw adjustments are marked as to their group number and frequency range coverage.

(d) Tune in the station in the usual manner, using manual tuning, and determine the program.

(e) Turn the wave band switch completely to the right (clockwise).

(f) Turn the Flash-o-Matic selector switch to the position that corresponds to the group in which the desired station falls. This can be readily deter- mined, for as the Flash-o-Matic selector switch is turned the various call letters will light up.

(g) The toggle switch (SEE ILLUSTRATION) near the center of the Flesh-o-Matic tuning panel should be thrown to the "UP" position during the following adjustments.

(h) With the aid of a screwdriver adjust (by turning clockwise or counter -clockwise) the OSC. trimmer condenser set screw (SEE ILLUSTR.4T)ON) corresponding to the proper station, until the same station that was tuned in manually is heard. Turn the volume control down so that any variation in sound output can be noted and readjust set screw for maximum sound output. T.4KE PARTICULAR CARE WHILE MAKING THIS ADJUSTMENT THAT THE SAME STATION IS HEARD .4ND NOT A NETWORK STATION BROADCASTING THE S.4ME PROGRAM.

(i) Now adjust the ANT. trimmer condenser set screw (SEE IJ.LUSTR.4- TION) having the same position number, for maximum sound output.

(J) Repeat the same procedure as outlined above for each of the remaining five stations.

(k) To insure accurate adjustment, it may be found advisable to replat the operations outlined in paragraphs (h), (i) and (J).

1

530 To 710 KC.

OSC. ANT.

e

2 U 530 To. 710 KC.

O0) 3

700 ro 1010 KC. ñnu W

WHEN SETTING

f[ASH.44N4T/C THIS SWITCH

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OSC. ANT.

5 e

e 1000 To 1500 KC.

e 6

AFTER e

SETTINGS AREREMADEE 1000 To 1500 KC.

RECEIVER ST BE OPERATED ITH SWITCH IN OWN POSITION

(I) Having completed the adjustments for the desired stations throw the

toggle switch (SEE I/.L('..S'I'R IT/ON ) to "DOWN" position. The

receiver is now ready for Flash-o-Iv1atic operation and any one of the six stations fo which the Flash-o-Matic has been adjusted, may be instantly "tuned in" by merely rotating the Flash-o-Matic selector knob to the desired station position.

(m) In order to reset one or more positions of the Flash-o-Matic tuning to other stations, it is merely necessary to follow the instructions outlined above; additional celluloid discs are supplied for this purpose.

OPERATING PROCEDURE: For Flash-o-Metic tuning turn the wave band switch completely to the right (clockwise): this will reduce the illumina- tion of the station selector dial. Then, turn the Flash-o-Matic selector switch until the Call letters of the desired station are illuminated. To return to standard or manual tuning simply turn the wave band selector switch toward the left (counter -clockwise) to the desired wave band.

ALIGPIASENT MODRL 6A80

Tuning ranges 533-1730 K.C., 1.71-5.7 M.C. and 5.67 and 18.1 M.C. Tubes 3-6K7G-6Á8G-6E5-6V6G-80. Remove chassis and connect output meter across voice coil of speaker. Set dial pointer at 1000 K.C. Turn volume control to maximum. Tone switch to high end. Band switch to broadcast. Connect modulated oscillator to grid of 6A8G in series with a .1 condenser and adjust trimmers 1-2-3-4-5-6 for maximum output at 456 K.C. reducing input signal of oscillator as required. Cheok pointer with condenser fully meshed. Turn pointer to 1500 R.C. Connect osoillator to antenna lead using a .0002 condenser as dummy antenna. With a 1500 signal adjust trimmers 7-8-9 for maximum output, reducing input signal as required. Turn pointer to 600 K.C. Shift oscillator to 600 R.C. and adjust padder 16 for maximum whi'e rocking gang condenser. Check alignment at 1000 R.C. Turn band switch to position. 2- turn pointer to 5 M.C. flee a 400 ohm carbon resistor for dummy antenna. Adjust trimmers 10-11-12 for maximum output. Check output at .8 and 2.4. Make sure 5 M.C. was aligned or fundamental and rot image. Turn band switch to position 3 - turn pointer to 15 M.C. Adjust trimmers 13-14-15 for maximum. Check image at 14.1. Check sensitivity at 6 M.C.



FADA PAGE 10-7

Ali;_,n^l.er_ t,-To.ltage Socket,Trimÿlers FADA RADIO & ELECTRIC CO

MDDEL 451 (TAKEN WITH LINE VOLTAGE

1,10DELS 20,20A, 203,20T (L,ate )

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120 A.C.) MODELS 20,20A,20B,20T. VOLTAGE DATA

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PAGE 10-8 FADA

14SJDEL 30 Late LLDEL 31 Late Schematics

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FADA PAGE 10-9

N AN T. COIL

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PAGE 10-10 FADA

MDEL S46 Schematic Voltage Alignment, Tr imr.iers Socket,Coils

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ALIGNMENT LAYOUT

FADA RADIO MODEL 346 - 115 VOLTS AC -DC - Tuning Range 540-1720 K.C. - 6 Tube Super- heterodyne. Tubes required - 6A8C-8S7-84%7G-25L6G-2525.,115.41.

Alignment Instructions* Do not attempt to align receiver until all other causes of trouble are checked then proceed as follows: ---Remove chassis from caso and connect output metor across voico coil of speaker. Set dial pointer at 1000 KO. and turn volume control to maximum position. Connect modulated oscillator to grid of 6A80 tubo in serios with a.l condenser. Adjust trimmers 1-2-3-4 for maximum roading at 456 K.C. roducing input signal of oscillator as roquirod. Chock pointer with condensor fully meshed. Turn pointer to 1500 K.C. Connect oscillator to antonna load using a .0002 condenser r.s dummy antonna. With a 1500 K.C. signal adjust trimmers 5 & 6 to give maximum output. Check sensitivity at 1000 and 600 K.C. with .n .gic wand.

75.207 50.45 35.3 35.114 35.72 35,115 25.92A

***USE ONLY

Dial Assonbly Volume Control i.ntonna Coil Oscill-.tor Coil

Input,I.F. Cutput I.F. Variable Condenser

GENUINE FACTORY REPLACEMENT PARTS ***

List 1.75 20.79 .80 105.110 .60 120.27 .45 140.37

1.00 .90 7L'.245

2.15

Electrolytic Condonser Spenkor

Pilot Light Socket Knobs (walnut)

(ivory )

Crystal

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FADA PAGE 10-11

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PAGE 10-12 FADA

UDDEIS 54,6154,554

Schematic,Voltage FADA RADIO & ELECTRIC CO Alignment, Trimmers Socket

3s.lzz

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I FADA RADIO & ELECTRIC COL

FADA RADIO MODEL 54 - 115 VOLTS - 50-60 CYCLES A.C. - Tuning Range 540-1720 end

1550-4000 K.C. - 5 Tube Superheterodyne. Tubes required -6A7-6D6-6Q7O_6Y6G-80.

Alignment Instructions: Do not attempt to align receiver until all other causes

of trouble are cheoked, then proceed as follows: ---Remove chassis and connect out-

put meter across voice coil of speaker. Set dial pointer at 1000 K.C. and turn volume control to maximum position. Band switch in broadcast position. Connect

modulated oscillator to grid of 617 tube in series with a .1 condensor. Adjust

trimmers 1-2-3-4 for maximum reading at 456 K.C. reducing input signal of oscil-

lator as required. Check pointer with condensor fully meshed. Turn pointer to

1500 K.C. Connect oscillator to antenna lead using a .0002 condensor as dummy

antenna. With a 1500. R.C. signal adjust trimmers 5 & 6 to give maximum output.

Check sensitivity at 1000 and 600 R.C. using magic wand. Set band switch in

police band position and chock sensitivity at 2800 K.C. Do not disturb trimmers

for this operation.

Frio« embjoot to ohmage without nottee.

50.47A Volume Control 45.44 Band Switch 75.229 Vernier Drive

35.122 Antenna Coil 35.132 Oscillator Coil 35.72 Input I.F.

35.73 Output I.F. 40.72A Power Transformer

List .85 .50

.25

.75 .60

1.00 1,25 3.25

List

25.3051 Variable Condenser 2.10 20.81A Eloctrolytic " 1.35 75.267 Pulley .20

75.290 Dial Plato .20

75.223 Dial Pointer .15

75,291 Dial Sca e .15

105.114 Speaker 4.25 75.230 Crystal .40

THESE READINGS TAKEN WITH LINE VOLTAGE 120 A.C.

Plato Scroon Cathode Anodo

6A7 112 62 2.7

6D6 112 62 2.7

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FADA PAGE 10-17

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FAIR. -MORSE PAGE 10-1

FAIRBANKS, MORSE & CO. MDDEL 7A Schematic,Socket Tr innner s

SCHEMATIC WIRING DIAGRAM OF THE MODEL 7A CHASSIS.

FRONT, SIDE, AND TOP VIEWS OF THE CHASSIS SHOWING TRIMMER LOCATIONS, TUBE LOCATIONS AND COMPONENT PARTS

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PAGE 10-2 FAIR. -MORSE

NODE L 7A Alignment, Voltage Tuner,Phono

The model 7A chassis la an AC operated superheterodyne with automatic

volume control, audio inverse feedback, permeability push button tun-

ing and tuning eye. It -incorporates three wave bands, broadcast, p6 -

lice -amateur and short wave. It is also equipped with a phono connec-

tion which permits the use of an external phonograph pickup.

THE PUSH BUTTON TUNER

It will be noted that only one operation le required for the setting

of each push button. This simplicity of operation le made possible

by the use of permeability tuned coils which have been accurately tracked at the factory so that it is not necessary to adjust external

trimmer condensers. in order to 'set' a station. Tracking is adcom- )lished by the careful spacing of the Iron core: on their common shaft

3o that for all settings of the adjusting screws the coils are in per-

fect alignment. The capacitance in the oscillator circuit is fixed

Yid may not be adjusted. This condenser (corresponding to the tun-

ing condenser in a manually tuned receiver) is sham as number 42 on the schematic diagram and has a value of 150 micro-microfarads. The

capacitance in the antenna circuit consists of two condensers, number

io and number 43. Condenser number 20 :met be adjusted when the Inf.-

:Sal alignment is made, but does not have to be touched at the time

:he buttons are 'set' for their individual stations. Its use is cov-

ared in the alignment instructions Instructions for

' setting -up' the push bu..tons are covered in detail in the instruc-

tion book which accompanies each receiver.

THE AUDIO CIRCUIT

the audio circuit is of conventional design with the exception of the

inverse feedback circuit consisting of resistors number 58 and num-

ber 57 and condenser number 38. Dy means of this network a certain

amount of the voltage present at the plate of the 81/80 tube is fed

back to the grid circuit of that tube. This voltage is, of course,

out of phase with the input voltage and degeneration is the result.

Any audio amplifier employing a loud speaker as the load will have a

certain amount of distortion introduced due to the fact that the im-

pedance varies with the audio frequency changes in the plate circuit of the output tube. This condition is more pronounced in amplifie using an output tube of the high impedance type such as the beam pe iodes. Inverse feedback effectively reduces the plate impedance

the tube and helps to smooth out these variations thus reducing di

tortion to a marked degree.

The subject cannot be treated more fully 'here due to space limitatlo

and has been mentioned merely to give the serviceman a brief expían

tion of the feedback circuit.

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ALL READINGS FROM SPECIFIED POINT TO GROUND (CHASSIS FAN) WITH VOLUME AND TONE CONTROL ADVANCED TO MAXIMUM. VOLUME NATURALIZER "IN", RANGE SWITCH ON BC POSITION, GANG CONDENSOR IN FULL MESH, NO ANTENNA AND CHASSIS GROUNDED.

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SCHEMATIC WIRING DIAGRAM OF THE MODEL 12B CHASSIS. VALUES OE COMPONENT PARTS MAY BE DETER- MINED BY COMPARING THE REFERENCE NUMBERS SHOWN ON THE DIAGRAM WITH THE REFERENCE NUMBERS

SHOWN ON THE PARTS LIST.

I I.

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FAIR. -MORSE PAGE 10-7 l'AGE 10-8 FAIR. -MORSE bADEL 12B FAIRBANKS, MORSE & CO. Alignment

should be heard at 20 megacycles minus .910 megacycle or 19.1

ALIGNMENT PROCEDURE megacycles approximately.

Alignment procedure is given Sn diagrammatic and chart form (see After setting the oscillator trimmer, increase the input from figure 3 and 4). Hake adjustments in the order given. Any re- the signal generator and make sure that the Image comes Sn at

liable low range AC voltmeter, preferably about 0-5 volts may the proper point. When you can hear one signal at the frequency be used as an output meter. It should be connected across the to which your generator is set, and one at about 1 megacycle speaker voice coil for best results. The volume control should below it, you are ready to finish the alignment. Go back to be set at maximum during the` alignment and -the output from the the fundamental frequency and start peaking the RF trimmer, signal generator should be decreased as the meter pointer tends rocking the tuning condenser slightly as you do so. When you to go off scale. If too strong a signal is used and the volume reach a peak, compare the strength of the fundamental signal control'is used to keep the pointer on scale, the AVC will op- and the image. If the image is the stronger, you have the wrong erate and inaccurate alignment will result, peak on the RF trimmer. Find the other peak and again compare

the two'signals. You will probably find it necessary to increase When aligning the police and short wavebands, care must be the generator output greatly In order even to hear the image taken to see that the trimmers are set on the proper frequency when you have found the right peak. and net on the image. The Image falls 910 kilocycles below the

fundamental signal on the dial, so at 20 megacycles the image Repeat this operation for the antenna trimmer.

Volume Step Connect Signal Geuentuor Dummy AntennaRange Dial Section

Adjusting Peak Nat -R -I. No. Generator To Frequrnc,, Switch Position Setting Screw No. For Switch

1 6K8 Grid 455 KC .1 Mfd. Condenser Broadcast (A) 540 KC 3rd IF Trans. 11 Maximum Off

2 6K8 Grid 455 KC .1 Mfd. Condenser Broadcast (A) 540 KC 3rd IF Trans. 12 Maximum off

3 6K8 Grid 455 KC .1 Mfd. Condenser Broadcast (A) 540 -KC 2nd IF Trans. 13 Maximum Off

4 6K8 Grid 455 KC .1 Mfd. Condenser Broadcast (A) 540 KC 2nd IF Trans. 14 Maximum Off

5 6K8 Grid 455 KC .1 Mfd.-Condenser Broadcast (A) 540 KC 1st IF Trans. 15 Maximum Off

6 6K8 Grid 455 KC .1 Mfd. Condenser Broadcast (A) 540 KC 1st IF Trans. 16 Maximus Off

7 Antenna 1500 KC 200 Mmfd.Condenser Broadcast (A) 1500 KC B.C. Osc. 17 Maximum Off

8 Antenna 1500 KC 200 Mmfd.Condenser Broadcast (A) 1500 KC B.C. R.F. 18 Maximum Off

9 Antenna 1500 KC 200 Mmfd.Condenser Broadcast (A) 1500 KC B.C. Antenna 19 Maximum Off

10 Antenna 600 KC 200 Mmfd.Condenser Broadcast (A) 600 KC B.Ç. Padder 20 Maximum (1) (2)

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12 Antenna 1500 KC 200 Mmfd.Condenser Broadcast (A) Depress Instant 21 Maximum (3) Off

#9 Button Electric Tuning

13 Antenna 1500 KC 200 Mmfd.Condenser Broadcast (A) Depress Instant 22 Maximum (3) Off

19 Button Electric Tuning

14 Antenna 6.0 MC 400 Ohm Resistor Police Ama- teur (B)

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6.0 MC Police RF 24 Maximum (3) Off


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2.5 MC Police Padder

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16 Antenna 20.0 MC 400 Ohm Resistor Short Wave 20.0 MC Short Wave 26 Maximum (5) Off

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(C) RF


(C) Antenna

21 Antenna 8.0 MC 400 Ohm Resistor Short Wave 8.0 MC Short Wave (7) Off

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(1 While rocking. Repeat 7, 8,.9 and 10 until no change is noted.

(2 To check volume naturalizer operation, turn to "On" or "In" position. If functioning normally, volume level

will drop quite noticeably, under normal output volume.

(3) The performance obtained with this adjustment when push button tuning is employed is suitable, as a rule, only

when a conventional antenna system is used. The use of extremely long or short antennae, may necessitate a

minor change i.n this adjustment per best results.

(4) Check calibration at 2.5 MC. Padder is fixed.

(5) Check for image at 19.1 MC on dial approximately. Figure 4

(6) Check for image response.

(7) Check calibration at 8,0 M.C. Padder is fixed. ALIGNMENT PROCEDURE CHART

WDEL 12B Tuner Data,Parts Naturalizer Notes

IA'AIRI3ANhS, MORSF. & CO.

TRE PUSN BUTTON TUNER

It will be noted that only one operation Is required for the setting óf each push button. This simplicity of operation le

made possible by the use of permeability tuned coils which have been accurately tracked at the factory so that It Is not noose- eary to ádjuet external trimmer condensers in order to 'eat' a

station. Tracking is accomplished by the careful spacing of the

Icon cores on their common shaft so that for all settings oI the adjusting screws the coils are in perfect alignment. The capacitance in the oscillator circuit Is fixed and may not be adjusted. This condenser (corresponding to the tuning condenser in amanually tuned receiver) le shown as number ll on the schematic diagram and has a value of 140 micro-microfarade. The capacitance in the antenna and RF circuits consists in each case of two condensers, number 19 and 20 for the antenna, and number 21 and 22 for the RF. Condensera 19 and 21 must be adjusted when the initial alignment is made, but do not have to be touched at the time the buttons ara 'set' for their individual stations. Their use is covered in the alignment instructions 1n Figure 4. Instructions for setting -up the push buttons are covered In detail In the Instruction book which accompanies each receiver.

TRE AUDIO CIRCUIT

The audio circuit is of conventional design with the exception of the inverse feedback circuit consisting of resistors number 114 and 115, and condensers 116 and 122. By means of this network a certain amount of the voltage present at the plate of

each BUBO tube Is fed back to the grid circuit of that tube.

This voltage Is, of course, out of phase with the Input voltage and degeneration Is the result.

Any audio amplifier employing a loud speaker as the load will have a certain amount of distortion Introduced due to the fact that the impedance varies with the audio frequency changes In

the plate circuit of the output tube or tubes. This condition is more pronounced in amplifiers using an output tube of the hfgh impedance type such as the beam pentodes. Inverse feedback effectively reduces the plate impedance of the tube and helps to smooth out these variations thus reducing distortion to a marked degree.

The subject cannot be treated more fully here due to space .11m1 - Cations and has been mentioned merely to give the serviceman a

brief explanation of the feedback circuit.

PURPOSE AND OPERATION OF VOLUME NATURALIZER

In most transmitting stations, the operators attempt to keep the modulation percentage high at all times in order to increase

the area in which acceptable reception of their programs is pos-

sible. In so doing, a considerable portion of the volume range present in the studio program may be lost due to the fact that the lower volume portions of the program are raised to maintain coverage and thue require that the higher volume portions be

relatively attenuated to prevent over -modulation of the transmitter.

The volume gaturallzer is designed to compensate, in part, for this evil that often exists under present broadcasting conditions but should not be used indiscriminately. In general, its use is not justified on Oral programs although occasionally a

listener may prefer It. On some popular musical selections, the volume range Is so restricted that no appreciable difference will be noticed except as the frequency response Is Influenced by the naturalizer circuit. Of course the volume control should be reset, each time the naturalizer is switched in and out, to keep the reference volume approximately the name for more accurate comparison. This will not be necessary at relatively high volume, because the volume will not change appreciably as the naturalizer Is switched In or out, under these conditions.

On modern phonograph records, Its use 1s not often desirable as the volume range is generally acceptable. On older records, no definite recommendation can be made because great variations will be found, especially between recordings by different manu- facturers.

The method by which the volume naturalizer operates, can be simply described as controlled degeneration, whereby a portion oI the audio signal from the plate circuit of the 4I5 first audio tube, Is used to vary the bias voltage of preceding end interconnected tubes, in such a manner as to Increase the volume level on signals that were originally, suppressed at the transmitting station, and to decrease the volume level on signals that were Increased In intensity at the transmitter, thus re- storing In part, the original volume range present, for example, during a symphonic orchestra broadcast.

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FIRESTONE PAGE 10-1.

Sohematic,Voltage Socket,Trimmers FIRESTONE TIRE & RUBBER CO Chassis ,A1 ignment

NOTE : VOLTAGE READING TAKEN FROM TUBE SOCKET CONTACTS TO GROUND WITH A D.C. VOLTMETER HAYING A RESISTANCE OP 1000 OHMS PER VOLT. À BATTERY 4 yours. CURRENT DRAIN= 7.4 AMPERES

PADDEL 7407-3 Chassis 536

ANTENNA CIRCUIT: The antenna circuit is directly coupled to the antenna in contrast with the capacity coupled 'circuit used in some previous Firestone auto receivers. A small adjustable condenser is provided for adjusting the antenna circuit to the antenna. This adjustment is made near the high frequency end of the dial (1400 %.C.) instead of at the low frequency end, as with the capacity coupled sets. There are two taps provided on the antenna coil. One for use with whip or low capacity type antenna, and the other for running board or high capacity type antenna. The antenna coil is set at the low capacity tap at the factory and must be changed (by means of the small tip jack located in the receiver at the antenna coil) if a high capacity antenna is used. This is done by merely removing the small tip jack from its present tap on the antenna coil and inserting the jack in the other receptacle Erovided.

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I1DDEL S7407-5 Schematic,Voltage, Socket,Trir.mers,

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TUBE SOCKET ARE VIEWED FROM UNDER SIDE OF CHASSIS. VOLTAGE

READINGS SHOWN AT SOCKET PRONGS ARE TO CHASSIS, AND ARE TAKEN

WITH NO SIGNAL. WHERE NO READING IS GIVEN, THE VOLTAGE IS ZERO

OR TOO LOW TO READ.

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LOCATIONS OF TUBES & TRIMMERS- BOTTOM COVER REMOVED

SETTING UP THE MONOMATIG TUNING MECHANISM:

Remove the plate that covers the Monomatic tuning adjustments onthe receiver -case.

Operate the Monomatic button (marked "Push") until the dial becomes illuminated, indicating that the receiver Is adjusted for Dial Tuning. Then tune in your 41 station, using the Station Selector knob.

Operate the Monomatic button until the #1 station indicator (furthest

left of the five indicators) becomes illuminated.

Turn the 41 station screw marked "OSC" (see Fig. 3) until your 41 station is tuned in. Other stations may be heard during this operation. If in doubt whether you have your, desired 41 station, compare it with the original station by operating the Monomatic button until the Dial Tuning position le reached.

T2

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LOCATIONS OF TRIMMERS

ACE_ -.lusting the "OSC" screw as carefully as poseible,adjust the "ANT" screw for maximum volume and best reproduction. After having done so, it is advisable to re -check the adjustment of the "OSC" screw and then the "ANT" one again to insure greatest accuracy.

Tune in your 42 station and operate the Monomatic button until the #2 indicator. becomes illuminated. Then proceed to adjust the two screws for this station in the same manner as was just done for the #1 station. Always adjust the "OSC" screw before adjusting the "ANT" one, and then repeat the adjustments for greater accuracy.

- TOP COVER REMOVED

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ADJUSTMENTS FOR

STATION N I

ADJUSTMENTS STATION .2

ADJUSTMENTS STATION .3

ADJUSTMENTS

STATION M 4

ADJUSTMENTS STATION .A 5

Then replace the cover in the receiver case. Insert the proper call let tern, cut from the sheets supplied, in the indicator button slots. Fig. 3

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PAGE 10-4 FIRESTONE MODELS S7425 -4,S7425 -5,S7426-5 Allrnment SCher,etiCS,SOCket,TrimmerS FIRh.S1'O\'14: 'ITIRh. & lt1'1-3131+.R CO.

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G-17 GANG CONDENSER S-300 SPEAKER

TUNING CONTROL

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The clock will keep correct time only when connected to a 60 cycle, 110 to 120 volt A.C. power supply. Never plug into a direct current circuit.

4 Tube AC Tuned Radio Frequency Receiver With Electric Clock

fLEft: TO DIAGRAM OF MODEL S-7425-4 (ABOVE)

"4 ANT 1400 KC

"8" R.F 1400 KC

ONO NO DESCRIPTION ÑÓ Pa? DESCRIPTION

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SPEAKER I L-110 ANTENNA COIL S-300 :-25 GANG CONDENSER 2 L -III RF CO11.

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4, 4 TUBE TR.F

POWER SUPPLY. This receiver is designed to operate on any alternating current supply (A.C.) ranging from 110 to 120 volts,

50 to 60 cycles; or on any direct current supply 07.C.) ranging from 110 to 120 volts.



FIRESTONE PAGE 10-5

Schematic s,Socket Trimmers ,Alignment FIRESTONE 'l'IRE & RUBBER CO. Voltage

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ground. Align all four I.F. trimmers to peak or maximum reading on :he output meter. BROADCAST BAND ALIGNMENT. Connect the antenna terminal to the generator through a 200 MMF dummy and the ground terminal to the generator ground. Set the dial and generator at 1720 KO (gang at minimum capacity). Align the BC oscillator trimmer for maximum output. Set the test oscillator at 1400 KC and tune in the signal with the dial and adjust the antenna trimmer for maximum output. Check the sensitivity at 600 to determine if the gang or the coils have been damaged.



FIRESTONE PAGE 10-7

Schematics ,Socket ,Triaunera 3'DDEL S7426-7( Mar .1939) Alignment ,Voltage FIRESTON>i: 'l'IRE & RUBBER CO. IMEL S7428-2

BEFORE ALIGNING, PLACE LOOP ANTENNA AND THE "A" AND "B" BATTERIES IN THE SAME APPROXIMATE POSITION IN THE BACK OF CHASSIS THAT THEY WILL BE IN WHEN THE SET IS IN THE CABINET AND THE CABINET BACK CLOSED.

When adjusting 1730 kilocycle oscillator trimmer and 1400 kilocycle antenna trimmer, do not connect test oscillator to terminals on bottom of cabinet back.

Couple test oscillator to receiver loop by: a) Make a loop consisting of five to ten turns of No. 20 to 30 size wire wound on a three inch

form and attach across output of test oscillator. b) Place test oscillator loop near set loop-BE SURE THAT NEITHER MOVES WHILE ALIGNING.

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PAGE 10-8 FIRESTONE

I1á.)DEL S7426-9 Schematic,Socket Tr il>ºner s ,Al ignment Voltage

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BEFORE ALIGNING, PLACE LOOP ANTENNA AND THE "A" AND "B" BA1-i7:HY-PACK IN THE SAME APPROXIMATE

POSITION IN THE BACK OF CHASSIS THAT THEY WILL BE IN WHEN THE SET IS IN THE CABINET AND THE CABINET

BACK CLOSED. When adjusting 1650 kilocycle oscillator trimmer and 1400 kilocycle antenna trimmer, do not connect test oscillator to ter-

minals on bottom of cabinet back. Couple test oscillator to receiver loop by:

d) Make a loop consisting of five to ten turns of No. 20 to 30 size wire wound on a three inch form and attach across output of test oscillator.

b) Place test oscillator loop near set loop-BE SURE THAT NEITHER MOVES WHILE ALIGNING.



FIRESTONE PAGE 10-9

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GENERAL DATA. The alignment of this receiver requires the use of a test oscillator that will cover the frequencies of 456, 600 and 1400 KC. and an output meter to be connected across the primary or secondary of the output transformers. If possible, all alignments should be made with the volume control on maximum and the test oscillator output as low as possible, to prevent the AVC from operating and giving false readings.

CORRECT ALIGNMENT PROCEDURE. The intermediate frequency (I.F.) stage should be aligned properly as the first step. After the I.F. transformers have been properly adjusted and peaked, the Broadcast Band should be aligned.

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BROADCAST BAND ALIGNMENT. Connect the antenna to the generator through a 200 MMF dummy and set the dial and generator at 1400 KC. Align the BC oscillator trimmer and BC antenna trimmer. Set the generator at 600 KC and tune in the signal to check sensitivity at this point to determine if coils or gang condenser have not been damaged.



Documents

a, 4.-----' · DETROLA PAGE 10-1 1 MODELS 251,256 Alignment Tuner r Édrast lrvreqw .yurrv.ave Aver 5.591 IF `'a No orders for parts will be accepted unless PART NUMBER, DESCRIPTION