KRAKAUER PAGE 8-2 MODEL Electone Piano Service Ilotes KRAKAUER BROS. AMPLIFIER CIRCUITS: The output transformer is especially designed and if it is placement is necessary. The tone

www.americanradiohistory.com

KRAKAUER PAGE 8-1

Schematics IDDEL Electone Piano Fick-up Connections KRAKAUER BROS. Preajli fier,Power Amplifier

USE GLASS TUBE ONLY FOR NIGH /N5ULAT/ON

TO PICKUP Í- SCREWS .1 MF .1 MF

ON PIANO

PRESET MAX. VOL: 70 AVOID

OVERLOAD

6K5G

3

USE ONLY BEST PARTS ANO SUSPECT - TH/S GROUP FOR CAUSING STAT/C LIKE NOISE - INSULATION MUST BE PERFECT - /00 MEGOHMS LEAKAGE - OR MORE

TO RAME O/V PIANO

FIL. -

MASTER VOL. CONTROL

SWELL PEDAL

6C5

SO M`." SO M`"'

8MF 450V. T

TONE CONTROL OMITTED

PREAMPLIFIER "ELECTONE " PIANO BU/LT BY DAVID BOGEN CO., /NC. 9-30-37

Ì d o

P

10

8MF Z 450V.

IrQ 0 p10 8"TAP

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PICKUP CONNECTIONS 'ELECTONE' PIANO

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2000" 2SIN

'00

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750-' 251Y

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TDUAL 8

POWER AMPLIFIER "ELECTONE" PIANO MADE BY DAV/D 50G5N CO., INC. 40 WATT INVERSE FEED BACK

FIXED B/AS 9-30-37

F/L.

EXTERNAL GRO UNO

/F NECESSARY

d

I/OV. AC

©John F. Rider, Publisher


KRAKAUER PAGE 8-2

MODEL Electone Piano Service Ilotes

KRAKAUER BROS.

AMPLIFIER CIRCUITS: The output transformer is especially designed and if it is

placement is necessary. The tone control is subject

Some forms depend on the cathode with exact value.

Use only glass tubes in the input, as the leakage is less,

the output, beoause of the possibility of a short to the shell.

damaged, an exact re-

to wide variations according to individual requirements by-pass for control; therefore, replace this component

and only glass tubes in

NOISE ELIMINATION: First suspect dirt on the pick-up screws. These are insulated with lacquer, but

this is not perfect. Clean with a vacuum -cleaner with blower attachment, which should be run for a few minutes so that the hose will be free from dirt. A thin strip of paper can be worked between the strings and the pick-up screws to remove stubborn particles of dirt.

Moisture may get into the wooden strip supporting the pick-up screws. This can be dried by placing in the bottom of the piano a 2 pint fruit jar which is 1/3 filled with calcium chloride. This should be renewed when it disintegrates. When the strip is dry it should be oiled with Nujol.

Another source of noise may be leakage in the input group (the two 10-megohm resis- tors and the .1-mf condenser). Replace with the best components obtainable. In severe. climates place these three components in a small cardboard pill -box and fill it with paraffine wax, bringing out the leads so they can be readily connected to their proper points.

HUM: Hum may be due to trouble in the filters, unmatched output tubes, or a poor bias

rectifier, if trouble is confined to the amplifier.

Electrostatic pick-up to screws is shielded by the back -board of the piano. This board must make good contact with the ground clamps. If proper contact can not be

established, cover the back -board with tin -foil shellaced in place and grounded.

REGULATING PICK-UP SCREWS: This must be done with the help or a professional piano tuner who must be a tone

regulator. The tuner should tone regulate the piano very soft, paying attention to eveness of tone and not eveness of volume. Then he oen strike the notes, telling the serviceman at the rear of the piano, if the pick-up screws need adjustment. Turn screws to right to make louder -- to the left to make sorter. Take care that screws are not turned too far to the right, so that the strings will touch screw when a very hard blow is struck on the key.

These screws should ordinarily need no attention during the life of the piano. Only in case of buckling of the mechanism or tampering need these be touched.

SETTING MASTER LEVEL CONTROL: The striking of the hammer on the strings sets up tremendous transients in the elec-

trical circuit which last a small fraction of a second. These tend to overload the amplifier and when the average output of the amplifier is 3 or 4 watts, the transients may be of the order of several hundred watts. Accordingly, a 40 watt amplifier is used for low average power. Do not set the screw -driver type volume control too high. The instrument is not supposed to sound much louder than an ordinary acoustic piano.

Overload causes rattling similar to speaker cone rattles. Do not blame the speaker until you are sure.

SWELL PEDAL ADJUSTMENT: The mechanical connection from the swell pedal to its control should be set so

that with the pedal completely depressed, the sound from the speaker is just not notice- able.

NOTE: Special parts and further service information may be obtained from Krakauer Brothers,

191 Cypress Ave . , New York City.



LAFAYETTE PAGE 8-1

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D John F. Rider, Publisher


AGE 8-2 LAFAI ETTE

1 0EL EB8 MODEL EB9 Schematics Socket, Parts

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LAFAYETTE PAGE 8-3

MOTE. SON[ 110003 HAWK 350,l R'E} IMCORN RAT (0 IM Va.. COMT.

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PAGE 8-4 LAFAYETTE MODEL A18 MODEL C25 Schematics

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®John F. Rider, Publisher


LAFAYETTE PAGE 8-5

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PAGE 8-6 LAFAYETTE MODELS D30,D31 YODEL .M31(1935) Schematics

a

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PILOT L/E/1

I.AFAITF:'I'T}K RADIO M FG. CO.

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LAFAYETTE PAGE 8-7


ICB

1.7.;TZ SW/ 'ON

(CCoSeo) FOR RAO/O. 'OFF"(OPON) FOR PHONOGRAPH

SW.2 ([OSSO) FOR PNONO6RAPN OPEN) FOR ROO/O i

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30

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Type 050

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PAGE 8-8 LAFAYETTE

NODEL C40 MODEL SL45 Schematics

Alignment

4.1

- -: -


LAFAYETTE MODEL C40 ------

G Q

E -' -

-

:lab ill

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V1--58 Tube V2 -1-.A7 Tube V3-57 Tube V4 -2A5 Tube V5-80 Tube V6-2.5 V. Pilot Light C1-2-365 Mmfd. Var. Cond. C3-175 B.C. oscillator section C4-.00025 Mfd. C5-6-14-.05 Mfd. 1'78-ll--l0 Mfd. C9-.01 Mfd.

LAFAYETTE MODEL SL45

C10-.006 Mfd. C12-6 MM. C15-.0005 Mfd. LI-Antennae Coil L2-R.F. Coil L3-Oscillator Coil L4-I.F. 175 K.C. Coil R1 -4M Vol. con. 190 -Ohm min. with

switch R2 -50M Resistor R3 -10M Resistor 114-50M Resistor

11

QQ00,_ QL

leve/ ..., CO... AC

R5 -10M Resistor R6 -250M Resistor 117-250 M Resistor 118-410 Ohms Resistor PH.-Phono TC.-Tone Control TI-Power Trans. T2-Audio Trans. CHI-Speaker Field SW-Switch on Vol. Control SS.-Speaker Socket SP.-Speaker Plug

To align receiver-Short C3-apply 175 ii.('-. to grid of VS and adjust L4 with RI fully on-remove short -Tune in 1500 K.C. signal and adjust Trimmer on C3 to 11.5 on dial-adjust trimmers on Cl and C2.

on C3



LAFAI"I:TTE PAGE 8-9

CE

200

Ri

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SWITCH ON VOL. CONTROL

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®John F. Rider, Publisher


PAGE 840 LAFAYETTE

MODELS B97-98 Socket,Trimnrs Coils, Phono

5Z4 M. REST

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BACK OF CHASSIS

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ANTENNA R.F. TRANS. TI IST INTERSTAGE R.F. TRANS. T2 2ND INTERSTAGE R. F. TRANS. T3

í510E TOWARD FRONT OF CHASSIS`

NOTE : RESISTANCES OF WINDINGS LESS THAN .1 11. ARE NOT SHOWN.

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GI, 1600 KC ON FRONT PANEL

POWER TRANS.

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CII 2ND INT. RANGER CH) 2ND INT. RANGE G

IST I.F. TRANS. 4 IST.TLC26 . I.F.

Fig. 3 --Location of Trimmers



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KRAKAUER PAGE 8-2 MODEL Electone Piano Service Ilotes KRAKAUER BROS. AMPLIFIER CIRCUITS: The output transformer is especially designed and if it is placement is necessary. The tone