McIntosh MA6900 Service Manual

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

McIntosh MA6900 Specifications

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