MC275
MAINTENANCE MANUAL
MC275
STEREO POWER AMPLIFIER
(Serial No.'s 275-10001 to 275-10147
and 100E1 & above)
C.T.
AND 600 A
OUTPUT
OUTPUT
600 A
OUTPUT
V
OBTAIN
TO
70.7
600 A
OUTPUT
V
RETURN,
70.7
V
ARE
RECEPTICAL CONNECTIONS
70.7
LEFT
RIGHT
LEFT
OUTPUT
1 AND 7-
1-GROUND,
A/70.7
PIN
600
PINS
RIGHT
5-
3 -
AND
AND
1 AND 8 -
4
2
PINS
PINS
PINS
SERIES CONNECT
OUTPUTS
OR
SINGLE CHANNEL OUTPUT
THE L AND R
DESIRED OUTPUT IMPEDANCE.
PARALLEL
FOR
SINGLE CHANNEL (MONO) OUTPUT NOTE
TO 1%:
TOLERANCE RESISTORS
R24 AND R27
MATCHED
FOLLOWING COMPONENTS
* 5%
A
R49 AND R52
R11 AND R36
R13 AND R38
in
Off
Unit
160K*
1M
Resistance
Ohms
1M
160K*
3.3K
0
160K*
3.3K
18K
37K*
18K
0
40K*
12K*
2.4M"
0
12K
210K
2.7K
0
210K
1M
170K
1M
170K
0
2.7K
0
38**
38**
0
038260
170K
15
6
at
.44
.47
.44
2.1
0
Volts
AC
rated output
Volts
Signal
100
DC
No.
2.1
1000.95
.95
0
0
12
.47
6.3
.96
2.1
0120
100
106
0
240
0
240
.96
6.3
106
84
0
152
12
.7015212.7
365224003652240
112
6.3
0
205
112
152
152
149
-57
-57
149
0
0
6.3
-57
-57
205
0
112
116
149
0 or 6.3
0
450
450
116
6.3 or 0
ground.
-57
ground.
0
.6
to
to
RESISTANCE CHART
AND
1
234&5
Pin No.
678
1
9
234&5
6
1
7
2
8
9
3
4&5
678
1
9
234&56789
1
23456
7
8
VOLTAGE
Tube
12AX7
(VI)
12AU7
(V2 or V5)
12BH7
(V3 or V6)
12AZ7
(V4 or V7)
V10.V11)
V9,
KT88/6550
(V8,
operating voltages.
the
measure
condenser C25A shorted
to
with
used
is
resistance measured
resistance measured with condenser C24B shorted
"This
"This
High impedance VTVM
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