McIntosh MA6500 Service Manual

BLOCK DIAGRAM
5
6
MA6500
20dB
AMP
20dB
AMP
SUPER TRACKING
VOLUME CONTROL
SUPER TRACKING
VOLUME CONTROL
MONO
SWITCHING
LOUDNESS
COMPENSATION
CONTROL
LOUDNESS
COMPENSATION
CONTROL
MONO
SWITCHING
BALANCE
CONTROL
BALANCE
CONTROL
TONE
AMP
TONE
AMP
TURN-ON
DELAY
TONE
CONTROLS
MATCHING
NETWORK
INPUT
ELECTRO-
MAGNETIC
SWITCHING
INPUT
ELECTRO-
MAGNETIC
SWITCHING
INPUT
ELECTRO-
MAGNETIC
SWITCHING
DATA
PORT
REGISTER
MICRO
CONTROLLER
INPUT
SELECTOR
LOGIC
IR
SENSOR
R IAA
AMP
R IAA
AMP
OUTPUT
MUTING
OUTPUT
MUTING
HEAD-
PHONE
AMP
HEAD-
PHONE
AMP
AUX
TUNER
VIDEO
TAPE
CD1
CD2
TUNER
VIDEO
AUX
TAPE
PHONO
PHONO
AUX
TUNER
SUM
CD1
CD2
VIDEO
TAPE
HOME
OUTPUT
MUTING
LOGIC
HEAD
PHONE
RIGHT
CHANNEL
INPUTS
DATA
PORTS
CD1
CD2
LEFT
CHANNEL
INPUTS
POWER
CONTROL
EXT IR
SENSOR
TO PREAMP IN (INT)
PREAMP OUT LEFT
TO PREAMP IN (INT)
PREAMP OUT RIGHT
POWER
TRANSFORMER
RECTIFIERS
AND FILTERS
LAMP
FUSE
FRONT PANEL
LAMPS
MAIN
RELAYS
MAIN
SUPPLY
-15V
REGULATOR
15V
REGULATOR
5.6V
REGULATOR
LAMP CONTROL
LOGIC
B-
B+
11.5VAC
-15V
15V
5.6V
THERMAL
PROTECTION
120VAC
50/60Hz
MAIN
FUSE
IN RUSH
CURRENT
LIMITER

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