McIntosh C2500 Service Manual

J16:7
J16:6
2C
2C
2C
2C
GND
GND
GND
GND
GND
0V
1.2V
70V
1V
2C
2C
J6:11
J6:9
2C
2C
2C
0V
475k
R59
1.2V
.022µF
C40
1V
10µF
C48
2C
2C J6:10
TO MAIN
L MAIN B
L MAIN 1
100V
10µF
C37
0V
0V
130V
105V
R MAIN 2
TO MAIN
R MAIN A
100V
47.5k
R55
47pF
C43
475k
R61
.022µF
C41
47pF
C42
475k
R60
105V
KEC BF421-AT/P
2 1
3
Q5
#132352
47.5k
R69
10µF
C47
GND
GND
L MAIN 2
J16:8
2 1
3
Q6
47.5k
R71
J16:3
J16:2
J16:4
J16:5
J16:1
47pF
C45
10k
R63
10k
R58
15k
R66
70V
267k
R67
47pF
C44
10k
R62
12AX7A
3
2
1
V5:1
12AX7A
8
6
7
V5:2
.47µF
C51
J6:2
J6:5
J6:3
.47µF
C49
12AX7A
8
6
7
V6:2
12AX7A
3
2
1
V6:1
10k
R56
475k
R57
15k
R64
267k
R65
J6:4
J6:6
J6:9
J6:7
J6:8
J6:10
J6:12
J6:11
146V
146V
146V
157V
157V
157V
157V
157V
1k
R78
1k
R79
10k
R70
10k
R72
12AX7A
5
9
4
V4:3
12AX7A
5
9
4
V5:3
18V
12AX7A
5
9
4
V6:3
-18V
TUBE LIGHT
2B J14:3
J6:1
TUBE_LED
10M
R82
10M
R83
10M
R84
10M
R85
1k
R90
1k
R91
18V
18V
.022µF
C62
.022µF
C63
.1uF
C61
18V
67
68
9
TUBE 751461 SCH 3 of 3

McIntosh C2500 Specifications

General

Total Harmonic Distortion	0.08%
Signal to Noise Ratio	100dB
Rated Output Voltage	2.5V unbalanced, 5V balanced
Maximum Output Voltage	8V unbalanced, 16V balanced
High Level Voltage Gain	15dB
Type	Vacuum Tube Preamplifier
Inputs	6 unbalanced, 2 balanced, 1 phono MC, 1 phono MM
Outputs	3 unbalanced, 2 balanced
Weight	29 lbs (13.2 kg)
Input Impedance	47k ohms
Phono Voltage Gain	40dB (MM), 60dB (MC)
Frequency Response	+0, -0.5dB from 20Hz to 20, 000Hz +0, -3dB from 10Hz to 100, 000Hz