Overview

The MA2275 is the first McIntosh integrated amplifier to rely exclusively on vacuum tubes in all audio circuits. The new design combines classic vacuum tube audio performance with state of the art control technology.

A new ultra-low-noise preamp has been engineered for the MA2275. Old-fashioned point-to-point wiring, common in vacuum tube designs, has been replaced with glass epoxy printed circuit boards developed through modern computer-aided design techniques. Input switching is accomplished inside glass cylinders filled with an inert gas to prevent signal degradation.

Specification

POWER OUTPUT
Minimum sine wave continuous average power output per channel, both channels operating is: 75 watts into 2, 4, or 8-ohm loads.

RATED POWER BAND 20Hz to 20kHz

TOTAL HARMONIC DISTORTION
0.5% 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

SENSITIVITY
High 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 RATIO
High Level: 93dB below rated output
Phono Input: 80dB below 10mV input
Power Amp: 100dB below rated output

INTERMODULATION DISTORTION
SMPTE 0.5% max if instantaneous peak power does not exceed 150W per channel.

INPUT IMPEDANCE
High Level: 22k ohms
Phono: 47k ohms, 65pF

MAXIMUM INPUT SIGNAL
High Level: 8V
Phono: 90mV

MAXIMUM PREAMP VOLTAGE OUTPUT
High Level: 8V
Phono: 8V
Main Out: 8V at preamp output

VOLTAGE GAIN
High level to tape: 0dB
High level to main: 15dB

POWER REQUIREMENTS
120V, 50/60Hz, 3.6 Amps

PREAMP TUBE COMPLIMENT
2 – 12AX7A Phono circuitry
2 – 12AX7A High level circuitry

POWER AMP TUBE COMPLIMENT
2 – 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)

WEIGHT
77 lbs. (35kg) net, 110 lbs. (50kg) boxed

About the brand

History of Innovation.
Distinctive styling and meticulously high manufacturing standards ensure components perform and look new for decades. The product itself is timeless in its design. McIntosh products are part of the emotional bond between listeners and their music.

Research is what makes McIntosh unique, McIntosh has developed and earned several patents for circuitry used today such as Power Guard, LD/HP and the Autoformer, all proprietary to McIntosh and differentiates us from the rest.

Excellence is the common goal shared by the dedicated staff at McIntosh. From Engineering through production to the warehouse, this tightly knit group of co-workers working side-by-side, and whose skills have been honed through years of experience, provide the foundation of McIntosh's continued success.

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