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2
readings be recorded on the amplifier schematic a-
bove the typical voltages shown.
SERVICING
When servicing the amplifier, the following points
should be observed
1 The condition of the output stage measuring the
speaker bus voltage at the junction of R21 and
the collector of Q8
2 Circuit resistances should be measured only ai-,
ter removing the associated tlansistor or trans-
istors, to prevent damage due to ohmmeter bat-
tery voltage
3 DO NOT
remove
01
insert tlansistors
with the
pov.,.cr
ON
4 DO NOT probe the printed board with a metal
probc with the power ON
5
Cilcuit
voltages
are rev€lsed
from
standard va-
cuum tube practice, as is the polarity of all
electrolytic capacitOls
6
The location of the positive end of each elec-
trolytic capacitOl is indicated by the white dot
marked on the top of the circuit board
PARTS LIST
Symbol No
Gales Stock No
Description
Cl, C2, C3,
C4, C9
C5
C6
522 0242 000 Cap., 25 mfd, 25 V
506 0005 000 Cap, 1 mfd., 200 V
522 0178 000 Cap, 25 mfd , 6 V.
B-
-37VDC-
(Tl)tNPUT-
(Tl)lNPUT-
VOl,
CONT .. ARM-
VOL. CONi. TOP -
II+&GND" ItETUaN-
OUTPUT-
L
n
Symbol No
C7,
C8
C12
C13
C14
Q1
Q6
Q2,
Q3. Q4, Q5
Q7, Q8
Rl
R2, R3
R4
R5
R6
R7,
R8
R9, R19, R20
R10, R14
Rll
R12, R18
R13
RI5
R16
R23
R24
R21, R22
R25
R17
T1
XDl,XD2
XQl,XQ2,
XQ3,XQ4,
XQ5,XQ6
XQ7,XQ8
Gates Stock No
516 0054 000
522 0256 000
5220246 000
506 0006 000
506 0004 000
380 0115 000
380 0011 000
380 0112 000
3800014 000
3800012000
5400081 000
5400071 000
5400076000
5400075000
5400057000
540 0036 000
540 0045 000
540 0041 000
540 0073 000
540 0085 000
5400039 000
540 0098 (JOO
540 0049 000
5400070 000
540 0017 000
540 0023 000
540 0005 (JOO
5400845 000
540 0025 000
4780285 000
404 0227 000
4040066000
404 0149 000
. Description
Cap, OOlmfd, 1KV, 10%
Cap, 20 mfd., 50 V
Cap, 100 mid, 25 V
Cap, 25 mfd, 200 \
Cap, .05 mid., 200 \
TlansistoL
2~:)O88
Transistor~ 2..~214
Transistor,
2X5087
Transistor,2N1414
Transistor, 2L'l1l83
Res, 22K ohm, 1/2 IV, 5%
Res., 8200 ohm, 1/2 IV ,5%
Res, 13K ohm, 1/2 IV ,5%
Res., 12K ohm, l!2IV ,5%
Res., 2200 ohm, 1/2 IV , 5%
Res, 3000hm, 112 W., 5%
Res., 680 ohm, 1/2 W., 5%
Res, 470 ohm, 1/2 W ,5%
Res, 10K ohm, 1/2
W.,
10%
Res, 33K ohm, 1/2 W., 5%
Res , 390 ohm, 112 IV. , 5%
Res, lI0K ohm, li2W., 5%
Res, 1K ohm, 112 IV" 5%
Res, 7500 ohm, 1/2W., 5%
Res . . ,47 ohm, l!2W., 5%
Res, 82 ohm, 1I2W, 5%
Res, 15 ohm, l!2W" 5%
Res,6 8 ohm, 1I2W ,5%
Res, 100 ohm, 1 / 21V . . , 5%
Tr ansfcnmer, Input
Dissipator
Socket
Socket
...
"
--v>N'--
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