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For the Consumers Protection: In order to ensure the highest level of customer satisfaction, newMcIntosh
products may only be purchased over-the-counter or delivered and installed by an Authorized McIntosh Dealer.
McIntosh products that are purchased over the Internet, by phone or mail order are presumed to be usedand
do not qualify for any McIntosh Warranty. McIntosh does not warrant, in any way, products that are purchased
from anyone who is not an Authorized Dealer or products that have had their serial number altered or defaced.
11.04.MA2275.20K 35006100
McIntosh Laboratory, Inc. 2 Chambers Street, Binghamton, New York 13903-2699
Tel (607) 723-3512 - US Toll-Free (800) 538-6576 - Fax: (607) 724-0549 - www.mcintoshlabs.com
MA2275
Vacuum Tube
Integrated
Amplifier
FLEXIBILITY
6 sets of unbalanced inputs,
main preamp-out/amp-in
connection and one additional
set of switched preamp
outputs are included.
PHONO INPUT
The ultra-quiet McIntosh
phono stage for moving magnet
cartridges is built-in. If desired,
this input may be changed to
aux high-level inputs.
FULL POWER DELIVERY
The MA2275 delivers
75 watts per channel into
2, 4, and 8-ohm speakers.
ULTRA LOW NOISE
AND DISTORTION
Distortion-canceling properties
of McIntoshs Unity-Coupled
Output circuit and unique
Output Transformer design
yield much lower distortion
and noise across the entire
20-20,000Hz music range.
WIDE BANDWIDTH
McIntoshs exclusive
Output Circuit and Transformer
designs ensure ultra-wide
frequency bandwidth
INVERTED CHASSIS
Heat producing tubes
are placed on top under
a protective cage, while
other circuits are shielded
by a beautiful polished
stainless steel chassis.
POWER OUTPUTMinimum sine wave continuous
average power output per channel,
both channels operating is: 75 watts
into 2, 4, or 8-ohm loads.
RATED POWER BAND20Hz to 20kHz
TOTAL HARMONIC DISTORTION0.5% max. at any level from 250
milliwatts to rated power output per
channel from 20Hz to 20kHz.
FREQUENCY RESPONSE+0, -0.5dB from 20Hz to 20kHz
+0, -3dB from 10Hz to 50kHz
SENSITIVITYHigh Level: 250mV for 2.5V
rated output (50mV IHF)
Phono: 2.5mV for 2.5V
rated output (0.5mV IHF)
Power Amplifier Input: 2.5V
for rated output
A-WEIGHTED SIGNAL-TO-NOISE RATIOHigh Level: 93dB below rated output
Phono Input: 80dB below 10mV input
Power Amp: 100dB below
rated output
INTERMODULATION DISTORTIONSMPTE 0.5% max if
instantaneous peak power
does not exceed 150W
per channel.
INPUT IMPEDANCEHigh Level: 22k ohms
Phono: 47k ohms, 65pF
MAXIMUM INPUT SIGNALHigh Level: 8V
Phono: 90mV
MAXIMUM PREAMP
VOLTAGE OUTPUT
High Level: 8V
Phono: 8V
Main Out: 8V at preamp output
VOLTAGE GAINHigh level to tape: 0dB
High level to main: 15dB
POWER REQUIREMENTS120V, 50/60Hz, 3.6 Amps
PREAMP TUBE COMPLIMENT2 -“ 12AX7A Phono circuitry
2 -“ 12AX7A High level circuitry
POWER AMP TUBE COMPLIMENT2 -“ 12AT7
4 -“ KT88/6550
OVERALL DIMENSIONS (H x W x D including knobs and feet)10-1/8" (25.7cm) X 17-3/4" (45cm) x 18-3/4" (47.6cm)
WEIGHT77 lbs. (35kg) net, 110 lbs. (50kg) boxed
2 x 75 watts (8/4/2 ohms)
All signal amplification by vacuum tubes
Wide power bandwidth with ultra-low distortion
Illuminated peak-responding wattmeters
Switchable meter illumination
Tape loop in/out provided
Gold plated input & output connectors
Noise and transient-free turn-on/turn-off
High-performance headphone output
Dual preamp outputs
Switched data output ports
External remote sensor jack
