Service Manuals, User Guides, Schematic Diagrams or docs for : . Rare and Ancient Equipment POLYTONE Polytone_PA378B_sch
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POLYTONE POWER AMP
PA 373B
modified
C10
7300uF
+
R15 CR1 RED/ AC
C3 R3 100
.01 Q5
470 MJ 4502
RED/ AC
D6
Q2 C11
NSDU57 7300uF BLU/ CT
+
R7 C7 R11
Q3
NSDU07
100 100p 100
C8
D1 D3
100p R17
I NPUT .075
R1 C2 R8 5w
PT1583
+
Q1 +
1K 10uF 10K R18
.075 OUTPUT
25V 5w -
+ C6 + C9 D4
50uF D2
50uF
50V 50V R13
R4 5 47
R19 R22
3.3 220
4.7K 2.5K
C1 R12 Q4 1/ 2 W
.0033 R2 NSDU57
15K 2.2K
1/ 2 W R20 R21
BI AS .3 .3
C5 ADJ . R14 10w 10w
1uF R6 R9 R10 2.5K D7
R5 470 C12
4.7K 50V 470 470 1/ 2 W .1 R23
NP R16 Q6
100 MJ 802 220
1/ 2 W
C4 .01
Notes, unless specified:
1. Resistor Values in Ohms (1/4W 5%) Q1 = PT1583, replaced by 2 x 2N5210
2. Capacitor Values in uFD Q2, Q4 = NSDU57 = MPSU57, replaced by MJE172
3. Diodes D1 thru D7 are 1N4004 Q3 = NSDU07 = MPSU07, replaced by MJE182
4. D3, D4 must contact Q3, Q4 thermally Q4 = MJ4502
5 additional resistor on solder side Q5 = MJ802
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