McIntosh C2500 Service Manual

TUBE PREAMPLIFIER
C2500
37
38
4
AUDIO
751458 SCH 4 of 5
47pF
C82
220pF
C81
100pF
C88
330pF
C87
31
2
G
D
S
Q31
31
2
G
D
S
Q35
3 1
2
G
D
S
Q32
3 1
2
G
D
S
Q36
31
2
G
D
S
Q29
31
2
G
D
S
Q33
3 1
2
G
D
S
Q30
3
1
2
G
D
S
Q34
39pF
C84
22pF
C92
330pF
C85
39pF
C83
22pF
C89
100pF
C86
47pF
C78
220pF
C77
MM3
MM1MM2
MM4
MM4
MM3
MM2
MM1
MM-L
MM-R
R
L
1k
R110
47.5k
R107
1k
R109
MM PH
47.5k
R108
D17
D18
1
TOP
3 5
J10:1
2
BOTT
4 6
J10:2
3A
3A
3A
3A
GND
GND
J2:1
J1:2
J1:1
J2:2
R MM IN
TO TU BE
L MM IN
J24:2
J24:1
J23:2
J23:1
3A
3A
3A
3A
GND
GND
R MM OUT
J4:2
J4:1
J4:3
J4:4
L MM OUT
FROM TUBE
J26:12
J26:8
J26:6
J26:10
MM SECTIO N
MM SECTIO N
221K
R405
AGND
1uF
C224
221K
R406
AGND
1uF
C225
AGND

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