McIntosh MA-6100 Service manual
MA
PREAMP AMPLIFIER
6100
SERVICE INFORMATION
STARTING WITH SERIAL NO. AE1001
MclNTOSH LABORATORY INC. 2 CHAMBERS STREET BINGHAMTON, NEW YORK
MA
6100
MA
6100
PERFORMANCE LIMITS
PERFORMANCE
Mclntosh audio power ratings are in accordance
with the Federal Trade Commission Regulation of
November 4, 1974 concerning power output claims
for amplifiers used in home entertainment products.
POWER OUTPUT
70 watts minimum sine wave continuous
average power output, per channel,
both channels operating into 8 ohms
load impedance which is:
23.7 volts RMS across 8 ohms
40 watts minimum sine wave continuous
average power output, per channel,
both channels operating into 16 ohms
load impedance which is:
25.3 volts RMS across 16 ohms
OUTPUT LOAD IMPEDANCE
8 ohms or 16 ohms
RATED POWER BAND
20 Hz to 20,000 Hz
TOTAL HARMONIC DISTORTION
0.2% maximum harmonic distortion at
any power level from 250 milliwatts to
rated power per channel from 20 Hz to
20,000 Hz, both channels operating
INTERMODULATION DISTORTION
0.2% if instantaneous peak power output is twice
rated continuous average power or less per channel
with both channels operating for any combination of
frequencies 20 Hz to 20,000 Hz
FREQUENCY RESPONSE
20 Hz to 20,000 Hz +0 -0.5 dB at rated power
NOISE AND HUM
Power amplifier: 95 dB below rated output
Aux, Tape, Tuner: 90 dB below rated output
Phono Input, Tape Hd.: 76 dB below 10 mV input
OUTPUT VOLTAGE
RATINGS
At TAPE output: Aux, Tape, Tuner: 300 mV with
input
Phono: 300 mV with rated input;
1.2 volts with 1.0 mV input at 1000
Hz
Tape Hd: 300 mV at 500 Hz with
rated input
DAMPING FACTOR
50 at 8 ohms output
100 at 16 ohms output
INPUT SENSITIVITY AND IMPEDANCE
Power Amplifier: 3 volts, 100,000 ohms
Phono 1 and Phono 2: 2.5 mV at 1000 Hz, 47,000
ohms
Tape Head: 3 mV, 47,000 ohms
Tape, Aux, and Tuner: 300 mV, 250,000 ohms
BASS CONTROLS
+ 16 dB to -16 dB at 20 Hz
TREBLE CONTROLS
+ 16 dB to -16 dB at 20,000 Hz
LF FILTER
Active filter, 12 dB per octave rolloff below 50 Hz;
20 dB down at 20 Hz
HF FILTER
Active filter, 12 dB per octave rolloff above 7000 Hz;
20 dB down at 20,000 Hz
GENERAL INFORMATION
SEMICONDUCTOR COMPLEMENT
36 Silicon Transitors, 22 Silicon Rectifiers and Diodes, 2 Silicon Bilateral Switches, 2 Triac
POWER REQUIREMENTS
120 Volts, 50/60 Hz, 50 watts at zero signal output,
380 watts at rated output
MECHANICAL INFORMATION
SIZE
Front panel measures 16 inches wide (40.64 cm) by
5 7/16 inches high (13.81 cm). Chassis measures
15 inches wide (38.1 cm) by 13 inches deep (33.02
cm), including Panloc shelf and back panel connectors. Knob clearance required is 1½ (3.81 cm) in
front of mounting panel
WEIGHT
34 pounds (15.42 kg) net, 46 pounds (20.87 kg) in
shipping carton
MA6100 BLOCK DIAGRAM
MA
6100
MA 6100
TONE
&
VOLUME
CONTROL
NOTE 10
PC
BOARD
044-514
LEFT
CHANNEL PREAMP
PC
BOARD
044-512
RIGHT
CHANNEL
PREAMP
PC
BOARD
044-512
EQUALIZATION
PC
BOARD
044-420
PREAMP SECTION
MA 6100
154-632
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