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MA2275
Vacuum Tube Integrated Amplifier

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.


Product Details: Features Product Details: Specifications Product Details: Resources Product Details: Buying Advice
MA2275 Vacuum Tube Integrated Amplifier Features

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

MA2275 Vacuum Tube Integrated Amplfier Specifications

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

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