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McIntosh Manuals
Amplifier
MC301
Service manual
McIntosh MC301 Service Manual page 12
Quad balanced power amplifier
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(20 pages)
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3 MAIN
751627 SCH 3 of 4
+57V
J5:9
4
+57V L
-57V
J5:6
4
-57V L
D R V +
J5:8
4
L DRV +
AM P
J5:7
4
D R V -
J5:5
4
L DRV -
PTC
J5:4
4
L PTC
GN D
J5:10
4
L OU T 2
J5:1
L OU T 2
5
L OU T 8
J5:2
L OU T 8
5
L C OM
J5:3
L C OM
5
GP2
6-32
19
L A MP
.0047µF
C36
R57
R60
430
4.99k
R59
10k
FE ED BAC K N ETW OR K
R61
22.1k
R63
475
C39
C38
220µF
220µF
C40
.47µF
R62
475
R58
C37
33.2k
10µF
1
Q5
-14V
PG
1
ATTE N U ATOR
Q4
D R IVER
C41
R70
R72
47µF
1k
1k
L INP
R68
C42
2.21k
1000pF
R66
2.21M
R67
2.21M
G D
3
C43
-18V
MUTE
Q7
1000pF
S
AM P M U TI N G
PG LIGH T
D R IVER
R64
2.21k
1
Q6
PG D ETE C TOR
R69
332k
6
R65
475
7
U9:2
5
C44
R71
332k
1pF
A GN D
A GN D
R75
47
+57V L
C45
R77
10µF
3.32k
1
Q11
POS
D IFFE R EN TI AL
AM P
1
1
Q9
Q17
R83
R78
221
221
G D
3
Q8
S
C47
100pF
1
Q12
1
Q15
R79
1k
POS
C U R R EN T
SOU R C E
LB -
LB -
LB +
LB +
N EG
C U R R EN T
SOU R C E
R80
1k
1
Q16
1
Q13
C48
100pF
R81
R84
221
221
1
1
Q10
Q18
N EG
D IFFER EN TI AL
AM P
R73
47.5k
1
R74
Q14
47.5k
R82
3.32k
-57V L
R76
47
C46
10µF
LPGN D
20
LB +
R89
332
D4
1
Q21
POS
VOL TA GE
AM P
D5
3
Q22
3
Q19
1.8V
R87
1.5k
LB -
R85
150k
R86
150k
LB +
R88
1.5k
-1.8V
3
Q20
3
Q23
D6
N EG
VOL TA GE
AM P
1
Q24
D7
R90
332
LB -
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