McIntosh C2500 Service Manual

71
72
10
AUDIO EXPANSION 751251 SCH
L
L
R
R
FROM
PROCESSOR
TO
221
R6
221
R5
10uF
C4
10uF
C3
47uF
C2
47uF
C1
LISTEN
100K
R4
100K
R3
22.1K
R2
22.1K
R1
J1:1
J1:2
J1:3
J1:4
J1:9
J1:10
J1:11
J1:12
2
1
3
4
K3
2
1
3
4
K4
221
R15
221
R16
5v
5v
2
1
3
4
K1
2
1
3
4
K2
221
R13
221
R14
5v
5v
D1
5v
2
1
3
4
K5
2
1
3
4
K6
221
R17
47uF
C9
L
22.1K
R11
R
221
R18
47uF
C10
22.1K
R12
5v
5v
R_MAIN
L_MAIN
5V
MUTE
R_MAIN +
R_MAIN -
L_MAIN +
L_MAIN -
1
3
2
G
-
+
J7
1
3
2
G
-
+
J6
R
L
J1:5
J1:6
J1:7
J1:8
J4:9
J4:4
J4:3
J4:6
J4:8
J4:5
J4:7
J4:12
J4:11
J4:10
J4:2
J4:1
MAIN OUTPUTS
47uF
C5
47uF
C6
47uF
C7
47uF
C8
22.1K
R7
22.1K
R8
22.1K
R9
22.1K
R10
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
1
J2:1
2
J2:2
1
J3:1
2
J3:2
1
J5:1
2
J5:2
J21:1
J21:2
J21:3
J21:4
J21:5
J21:6
J21:7
J21:8
J21:9
J21:10
J21:11
J21:12
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
J15:1
J15:2
J15:3
J15:4
J15:5
J15:6
J15:7
J15:8
J15:9
J15:10
J15:11
J15:12
R_FROM
L_FROM
L_TO
R_TO
TO
AUDIO
PCB
22uF
C11
22uF
C12
33.2K
R19
33.2K
R20
TO
AUDIO
PCB

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