McIntosh MA6500 Service Manual

1. The heavy lines on the schematics denote the primary
signal path.
2. Unless otherwise noted, all voltages indicated on the
schematics are measured under the following condi-
tions:
a. AC input at 120 volts, 50/60Hz
b. All voltages are +\-10% with respect to ground. A
high impedance (10megaohm) voltmeter must be
used.
3. Unless otherwise specified:
a. Resistors values are in ohms.
b. Capacitor values are in microfarads (uF).
c. Inductor values are in microhenries (uH).
4. On PC Board Drawings, Square Pad Indicates:
a. Polarized Capacitors - Positive
b. Diode - Cathode
c. Others - Pin 1
5. The voltages enclosed in a box are signal voltages that
are measured with a 2.5mV, 1kHz signal connected to
both channels at the TUNER input jacks.
NOTES
MA6500
Front panel controls are set at:
BALANCE ....................................CENTER DETENT
TREBLE BASS .............................CENTER DETENT
INPUT SELECTORS ...................................... TUNER
LOUDNESS .......................................................... OFF
POWER ................................................................... ON
VOLUME .................................FULLY CLOCKWISE
MONO................................................................... OFF
SPEAKER SWITCHES 1 AND 2........................... ON
Rear panel controls are set at:
PROCESSOR ........................................................OUT
PWR AMP INPUT ................................................. INT
SPEAKER TERMINALS .................... NO LOAD ON
OUTPUTS
6. WARNING:
Parts marked with the symbol have critical
characteristics. Use ONLY replacement parts recom-
mended by the manufacturer.
3

McIntosh MA6500 Specifications

Power Output

RMS Power Output at 8 ohms	120 W
RMS Power Output at 4 ohms	200 W
RMS Power Output at 2 ohms	250 W

Distortion and Noise

Total Harmonic Distortion	0.005%
Intermodulation Distortion	0.005%
S/N Ratio (A-Weighted) Power amp	110 dB below rated output

Input and Output

Maximum Voltage Output	8 V from 20Hz to 20kHz
Input Sensitivity High level	250 mV for 2.5 V rated output
Maximum Input Signal High level	10 V

Impedance and Gain

Output Load Impedance	2, 4, or 8 ohms
Input Impedance High level	22k ohms
Voltage Gain High level to tape	0 dB

Weight and Dimensions

Dimensions (h x w x d)	13.7 x 44.5 x 46 cm
Weight net	18.6 kg
Weight shipping	27.3 kg