McIntosh MC2000

SERVICE MANUAL
POWER AMPLIFIER
Performance Specifications ........................................ 2
Notes ......................................................................... 2
Rear Panel .................................................................. 3
Section Location ........................................................ 4
Block Diagram ...................................................... 5 - 6
Interconnection Diagram ...................................... 7 - 8
Input PCB and Schematic.................................... 9 - 10
Main PCB and Schematic.................................. 11 - 13
Power Supply PCB and Schematic ........................... 14
AC Power PCB and Schematic .......................... 15 - 16
Switch Remote PCB and Schematic .................. 17 - 18
Meter PCB and Schematic................................. 19 - 20
Bias Control PCB and Schematic ...................... 21 - 22
Meter Lamp PCB and Schematic ....................... 21 - 22
Lamp PCB and Schematic ................................. 21 - 22
Logo Lamp PCB and Schematic ........................ 21 - 22
Output PCB and Schematic............................... 21 - 22
Parts List ............................................................ 23 - 24
Exploded View and Parts List ............................. 25 - 28
Repacking Instructions ............................................. 29
CONTENTS

McIntosh MC2000 Specifications

General

Total Harmonic Distortion (THD)	0.5%
S/N Ratio	100dB
Type	Tube Amplifier
Frequency Response	20Hz - 20kHz (+0, -0.5dB)
Output Impedance	4, 8 Ohms
Tubes	8 x KT88, 4 x 12AX7

Summary

Performance Specifications

Electrical Performance Parameters

Key electrical parameters: power output, distortion, frequency response, impedance, and damping factor.

Input and Power Specifications

Details input sensitivity, tube compliment, and power requirements for the amplifier.

Physical and Finishing Details

Covers amplifier dimensions, finish specifications, and weight information.

Technical Notes and Warnings

Operational Notes

Notes on signal path indication, voltage measurement conditions, and component value units.

Critical Component Warning

Warning regarding critical components marked with a symbol; use manufacturer-recommended replacements.

Rear Panel

Rear Panel Warning

Shock hazard warning: Do not open. Replace fuses only with same type and rating.

Section Location

Top View Component Location

Identifies transformers, meter lamp PCBs, meter PCBs, logo lamp PCBs, switch, and lamp PCBs.

Bottom View Component Location

Identifies AC power PCB, SW remote PCB, output PCBs, power supply PCBs, main amp PCBs, input PCBs, and bias control PCBs.

Block Diagram

Signal Path Block Diagram

Illustrates signal flow from inputs through driver stages to output stages.

Power Supply Section Block Diagram

Details power input, transformers, voltage regulation, and DC supplies.

Interconnection Diagrams

Lamp and Control Circuit Interconnections

Diagram showing wiring between lamp, remote, bias control, and meter circuits.

Power and Amplifier Circuit Interconnections

Diagram showing wiring between power supply, AC power, remote, and output circuits.

Critical Component Warning (Interconnect)

Parts in shaded area have critical characteristics; use manufacturer replacements.

Input PCB Schematic

Main Amplifier PCB Schematic

Main Amplifier Signal Paths

Highlights the primary and balanced signal paths within the main amplifier circuit.

Critical Component Warning (Main)

Parts in shaded area have critical characteristics; use manufacturer replacements.

Power Supply PCB Schematic

Critical Component Warning (Power Supply)

Parts in shaded area have critical characteristics; use manufacturer replacements.

AC Power PCB Schematic

Critical Component Warning (AC Power)

Parts in shaded area have critical characteristics; use manufacturer replacements.

Switch Remote PCB Schematic

Switch Remote Power Connections

Details power input and connections for the switch remote PCB.

Input Sensitivity Selection

Shows connections for selecting input sensitivity (BAL/UNBAL).

Meter PCB Schematic

Meter Circuit Components

Details ICs, transistors, and controls related to the meter function.

Bias Control PCB Schematic

Meter Lamp PCB Schematic

Lamp PCB Schematic

Logo Lamp PCB Schematic

Output PCB Schematic

Exploded View - Part 1

Exploded View - Part 2

Repacking Instructions

Power Amplifier Carton Contents

Lists parts required for packing the power amplifier, including poly bag, foam pads, and rings.

Tube Set Carton Contents

Lists part number for the tube carton (gold) with foam pads.

Accessory Carton Contents

Lists parts for accessory carton, including inside/outside cartons and foam pad set.