McIntosh MC 502 Service Manual

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IIIIInquh

MC 502

POWER AMPLIFIER

SERVICE INFORMATION

STARTING WITH SERIAL NC). CEIOOI

MCINTOSH LABORATORY INC. BINGHAMTON, NEW YORK 13903

039308

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MC502

PERFORMANCE LIMITS

PERFORMANCE

POWER OUTPUT RATING

STEREO-75 watts into 2.7 to A ohm loads, 50
watts into 8 ohm loads, minimum sine wave
continuous average power output per channel
from 20 Hz to 20,000 Hz, both channels opera
ting.

which is: IA.Z volts RMS across 2.7 ohms

I7.3 volts RMS across A ohms

20.0 volts RMS across 8 ohms
MONO (Bridged)~l50 watts into an 8 ohm load,
minimum sine wave continuous average power
output from 20 Hz to 20,000 Hz.
which is; 30.6 volts RMS across 8 ohms
OUTPUT LOAD IMPEDANCE

STEREO: 2.7 to 8 ohms

MONO: 8 ohms obtained by connecting across
the output terminals of both channels.

RATED POWER BAND

20 Hz to 20,000 HZ

TOTAL HARMONIC DISTORTION

STEREO: .021 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.

MONO: .OZA maximum harmonic distortion at

any power level from 250 milliwatts to rated
power From 20 Hz to 20,000 Hz.

INTERMODULATION DISTORTION
STEREO: .022 maximum per channel with both
channels operating For any combination of
frequencies, 20 Hz to 20,000 HZ.
MONO: .02/ maximum at any power level from

ZSOmw to rated power for any combination of
frequencies, 20 Hz to 20,000 Hz

FREQUENCV RESPONSE (at one watt output)

20 HZ to 20,000 Hz, +0 -O,25 dB
l0 Hz to l00,000 HZ +0 -3.0 dB

NOlSE AND HUM

95 dB below rated output

RATINGS
OUTPUT VOLTAGES

25 volts for distribution lines

DAMPING FACTOR

Greater than 50

INPUT IMPEDANCE

75.000 ohms

INPUT SENSITIVITY

Switchable; 0.75 volt or 2.5 volts-Level
control provided For higher input voltages

GENERAL INFORMATION
POWER REQUIREMENTS

I20 volts, 50/60 Hz, 0.2 to A anperes

MECHANICAL INFORMATION

SIZE: Front panel measures l6 inches wide (00.6 cm)
by 3~5/8 inches high (9.2 Cm). Chassis measures
lA-S/h inches wide (37.5 cm) by 2~3/8 inches
high (6 cm) by lN-I/2 inches deep (36.8 cm),
including connectors. Knob clearance required
is I»l/h inches (3.2 cm) in front of nounting
panel.

WEIGHT: 27 pounds (l2.2 kg) net, 38 pounds
(l7.2 kg) in shipping carton