McIntosh MA6900 Service Manual (English)

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SERVICE MANUAL

Performance Specifications ........................................ 2

Notes ......................................................................... 2

Rear Panel .................................................................. 3

Section Location ........................................................ 4

Block Diagram ...................................................... 5 - 6

Interconnection Diagram ...................................... 7 - 8

Main Schematic and PCB.................................... 9 - 18

Balanced Schematic and PCB.............................. 12, 18

Heatsink Schematic and PCB ............................. 19 - 20

Capacitor Schematic and PCB ........................... 21 - 22

Control Schematic and PCB .............................. 23 - 26

Lamp Schematic and PCB ................................. 25 - 26

Tone Schematic and PCB .................................. 27 - 31

Keyboard Schematic and PCB ........................... 30 - 32

Parts List ............................................................ 33 - 36

Exploded Views and Parts Lists .......................... 37 - 40

Repacking Instruction .............................................. 41

CONTENTS

INTEGRATED AMPLIFIER

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General

Total Harmonic Distortion	0.005%
Signal to Noise Ratio	100dB
Input Impedance	20k ohms
Damping Factor	>40
Outputs	preamp outputs
Weight	75 lbs (34 kg)
Input Sensitivity	2.5mV (MM phono), 0.25V (line)
Output Impedance	2, 4 or 8 Ohms
Frequency Response	20Hz to 20kHz (+0 -0.5dB)
Inputs	6 line-level inputs (including balanced), 1 phono input