McIntosh WG1000 User manual

PREAMPLIFIER
C1000
SERVICE MANUAL
Performance Specifications ........................................ 2
Notes ......................................................................... 2
Rear Panel .................................................................. 3
Section Location ........................................................ 3
Block Diagram ........................................................... 4
Interconnection Diagram ...................................... 5 - 6
Main Left Schematic and PCB ............................ 7 - 20
Main Right Schematic and PCB ........................ 21 - 34
Balanced I/O Left Schematic and PCB .............. 35 - 36
Balanced I/O Right Schematic and PCB ............ 37 - 38
Balanced Switching Left Schematic and PCB .... 39 - 40
Balanced Switching Rightt Schematic and PCB ... 41 - 42
Meter Schematic and PCB................................. 43 - 44
Headphone Schematic and PCB .............................. 45
Parts List ............................................................ 47 - 56
Repacking Instructions ............................................. 57
CONTENTS
C1000
PREAMPLIFIER
Serial Number WG1001 And Above
SERIAL NO. WG1000 And Above

PERFORMANCE SPECIFICATIONS
2
1. The heavy notes on the schematic denote the primary
signal path.
2. Unless otherwise noted, all voltages indicated on the
schematics are measured under the following conditions:
a. AC input at 120 volts, 50/60Hz.
b. All voltages are +/-10% with respect to ground. A
high impedance (10 megaohm) voltmeter must be used.
3. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH).
4. On PC board drawings, Square pad indicates:
a. Polarized Capacitors - Positive
b. Diodes - Cathode
c. Others - Pin 1
5. WARNING
Parts marked with the symbol have critical
characteristics. Use only replacement parts recom
mended by the manufacturer.
NOTES
General Specifications
PowerRequirements
100 Volts, 50/60Hz at 120 watts
110 Volts, 50/60Hz at 120 watts
120 Volts, 50/60Hz at 120 watts
220 Volts, 50/60Hz at 120 watts
230 Volts, 50/60Hz at 120 watts
240 Volts, 50/60Hz at 120 watts
Note: Refer to the rear panel of the C1000 Controller for the
correct voltage.
Frequency Response
+0, -0.5dB from 10Hz to 40,000Hz
Total Harmonic Distortion
0.002% from 20Hz to 20,000Hz
Signal To Noise Ratio
High Level, 100dB
Phono, 88dB
Maximum Voltage Output
12V RMS Unbalanced, 25V RMS Balanced
OutputImpedance
220 ohms
Sensitivity
High Level, 450mV for 2.5V rated output
Phono MM, 4.5mV for 2.5V rated output
Phono MC, 0.45mV for 2.5V rated output
InputImpedance
High Level, 22K ohms
Phono MM, 47K ohms; 50 to 750pF, in 50pF steps
Phono MC: 25, 50, 100, 200, 400 or 1,000 ohms; 100pF
Overall Dimensions
C1000C:
Width is 17-1/2 inches (44.45cm)
Height is 6 inches (15.24cm) including feet
Depth is 24 inches (61.0cm) including the Front
Panel, Knobs and Interconnect Cables1
C1000P:
Width is 17-1/2 inches (44.45cm)
Height is 6 inches (15.24cm) including feet
Depth is 24 inches (61.0cm) including the Front
Panel and Interconnect Cables1
C1000T:
Width is 17-1/2 inches (44.45cm)
Height is 6 inches (15.24cm) including feet
Depth is 24 inches (61.0cm) including the Front
Panel and Interconnect Cables1
Weight
C1000C - 39.0 pounds (17.7 kg) net
61.4 pounds (27.9 kg) in shipping carton
C1000P - 33.0 pounds (15.0 kg) net
53.6 pounds (24.3 kg) in shipping carton
C1000T - 34.0 pounds (15.4 kg) net
54.6 pounds (24.8 kg) in shipping carton
1Interconnect Cables are supplied with the C1000
Preamplifier and C1000 Tube Preamplifier. They
are used to connect Preamplifier(s) to the C1000
Controller.
Maximum Input Signal
High Level, 5V Unbalanced, 10V Balanced
Phono MM, 50mV
Phono MC, 5mV

PREAMPLIFIER
C1000
3
REAR PANEL
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED

4
BLOCK DIAGRAM

PREAMPLIFIER
C1000
5 6
INTERCONNECT

78
MAIN LEFT 050103 SCH 1 OF 6
2A

PREAMPLIFIER
C1000
910
2B
MAIN LEFT 050103 SCH 2 OF 6

11 12
MAIN LEFT 050103 SCH 3 OF 6
2C

PREAMPLIFIER
C1000
13 14
MAIN LEFT 050103 SCH 4 OF 6
2D

15 16
MAIN LEFT 050103 SCH 5 OF 6
2E

PREAMPLIFIER
C1000
17 18
MAIN LEFT 050103 SCH 6 OF 6
2F

19 20
2
MAIN LEFT 050103 PCB 1

PREAMPLIFIER
C1000
21 22
MAIN RIGHT 050102 SCH 1 OF 6
3A

23 24
MAIN RIGHT 050102 SCH 2 OF 6
3B

PREAMPLIFIER
C1000
25 26
MAIN RIGHT 050102 SCH 3 OF 6
3C

27 28
MAIN RIGHT 050102 SCH 4 OF 6
3D

PREAMPLIFIER
C1000
29 30
MAIN RIGHT 050102 SCH 5 OF 6
3E

MAIN RIGHT 050102 SCH 6 OF 6
31 32
3F

PREAMPLIFIER
C1000
33 34
3
MAIN RIGHT 050102 PCB

35 36
5 BALANCED I/O LEFT 050105 SCH and PCB