McIntosh C8AC Service Manual

MC275
13 14
MAIN 751376 SCH 3 of 3
2
220 5W
R70
2.2µH
L3
KT88
2 7
V11:2
KT88
4
5
8
3
V10:1
2.2µH
L2
KT88
4
5
8
3
V11:1
KT88
2 7
V10:2
2 5W
R79
30k
R63
100k
R66
100k
R67
30k
R62
-225V
1µF
C46
1µF
C45
AMPLIFIER - RIGHT
J33:1
J33:12
J33:11
J33:3
J33:2
J33:10
J33:9
J33:5
J33:6
J33:7
J33:4
J33:8
J42
J44
J45
J46
J47
J48
J43
+480V
R OUT 16
R OUT 16
220 5W
R71
220 5W
R68
2.2µH
L4
KT88
2 7
V9:2
KT88
4
5
8
3
V8:1
2.2µH
L1
KT88
4
5
8
3
V9:1
KT88
2 7
V8:2
2 5W
R78
30k
R61
100k
R64
100k
R65
30k
R60
-225V
1µF
C44
1µF
C43
AMPLIFIER - LEFT
T2
J32:1
J32:13
J32:14
J32:2
J32:10
J32:9
J32:5
J32:6
J32:7
J32:11
J32:8
J35
J37
J38
J39
J40
J41
J36
+480V
L OUT 16
L OUT 16
220 5W
R69
L AUDIO TRANSFORMER
FIL A
+700V
FIL B
FIL A
FIL B
475k
R75
D23
22.1k
R80
L SM
R AUDIO TRANSFORMER
3
1
2
Q19
475k
R76
22.1k
R81
R SM
FIL C
+12.6V
Main - Output
2
R SENTRY
MONITOR
DETECTOR
L SENTRY
MONITOR
DETECTOR
D24
3
1
2
Q18
+350V
FIL C
FIL C
FIL C
FIL CFIL A
BLU
WHT
YEL
BLK
WHT/YEL
RED
WHT/BLU
YEL
ORN
RED
BRN
J32:3
BIAS
J34:1
J34:2
BIAS TP
221k
R72
3
1
2
Q16
+5V
4
2
1
3
Vcc
GND
5
U31
+5V
100K
R74
.47µF
C53
2200pF
C47
221k
R73
2200pF
C48
3
1
2
Q17
D21 D22
AUDIO
GRID
GND
47µF
C55
47µF
C54
16O8O4O
RIGHT OUTPUT
J8
J7
J6
J5
LEFT OUTPUT
J4
J3
J2
J1
.15µF
C1
4 5 W
R1
.15µF
C2
4 5W
R2
TERMINAL
4
BP1
BP2
BP3
BP4
BP5
BP6
BP7
BP8
T3
AUDIO DETECTOR
R(-)
R 4(+)
R 8(+)
R 16(+)
L(-)
L 4(+)
L 8(+)
L 16(+)
BLU
WHT
YEL
BLK
WHT/YEL
RED
WHT/BLU
YEL
ORN
RED
BRN
100K
R77
J33:14
J33:13
FIL B
FIL C
BRN
BRN
.22µF
C49
.22µF
C50
.22µF
C51
.22µF
C52
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
V9 PLT
V8 CATH
V8 GRID
FIL C
FIL A
+12.6V
GND
V9 GRID
L OUT 16
V9 PLT
V10 PLT
V11 CATH
V11 GRID
FIL C
FIL B
BIAS
+700V
V10 GRID
R OUT 16
V11 PLT
+350V
16O8O4O
-BIAS ADJUST-
ADJUST R19 FOR -60 TO -62VDC
ACROSS J34 AFTER 5 MINUTES ON
AND NO INPUT SIGNAL
TERMINAL 751379 SCH
4

McIntosh C8AC Specifications

General

Brand	McIntosh
Model	C8AC
Category	Amplifier
Language	English