McIntosh MC 275 CE Service Information

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McINTOSH LABORATORY WC, 2 CHAMBERS STREEY, BXNGHAMTON, New YORK 13903

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M6275 Tube Power Amplifier

Performance Limits

POWER OUTPUT, STEREO

75 watts into 16, 8 or 4 ohm loads is
the minimum sine wave continuous
average power output per channel from
20Hz to 20,000H2.

The output RMS voltage is:
34t6 across 16 ohms
24.5 across 8 ohms
173 across 4 ohms

POWER OUTPUT, MONO PARALLEL

150 watts into 8, 4 or 2 ohm loads is
the minimum sine wave continuous
average power output from 20Hz to
20,000Hz.

OUTPUT LOAD IMPEDANCE
16, B or 4 ohms stereo
8, 4 or 2 ohms mono parallel

RATED POWER BAND
20Hz to 20,000Hz

TOTAL HARMONIC DISTORTION

.5% maximum harmonic distortion at
any power level from 250 milliwatts to
rated power from 20Hz to 20,000Hz.

INTERMODULATION DISTORTlON

.5% maximum if instantaneous peak
power output does not exceed twice the
output rating for any combination of
frequencies from 20Hz to 20,000Hz.

FREQUENCY RESPONSE (at 1 watt output)
20Hz to 20,000Hz +0 -0.2dB
10Hz to 100,000Hz +0 ~3dB

NOISE AND HUM (A-Weighted)
100dB below rated output.

i n

Ratings

IHF DYNAMIC HEADROOM
1 .1dB

DAMPING FACTOR
Greater than 10

INPUT IMPEDANCE
100,000 ohms unbalanced
180,000 ohms balanced

INPUT SENSlTlVlTY

Unbalanced, 1.0V to 30 volts through
gain control.

Balanced, 2.0 volts fixed.

General Information

POWER REQUlREMENTS

120 volts, 50/60Hz

240 watts at zero signal output

400 watts at rated output
The amplifier may be connected for 100,
120, 220 or 240 volt 50/60Hz operation.
It is shipped connected for 120V.

Mechanical Information

SIZE
16" wide (40.6cm) by 7-1/2" high
(19.0cm) by 12" deep (30.5crn)

WEIGHT
67 pounds 1305kgl net, 75 pounds
(34.1kg) in shipping carton