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MA2275
Commentary

This is a bulb-type integrated amplifier that uses vacuum tubes for all stages of phono amplifier, preamplifier and power amplifier.

The main signal amplification stage, including the phono stage, is composed of a vacuum tube. The output is muted by the automatic turn-on delay until the vacuum tube is warm and ready for output, reducing the influence of noise caused by external vibration.

The power amplifier uses Macintosh's unique unity couple circuit and bifilar winding TRANSFORMERS to ensure flat response and wide-band power handling.

It uses an electromagnetic switch filled with inert gas. This switch is resistant to oxidation and enables distortion-free signal switching without contact failure over a long period of time.

Equipped with a Blue Eyes Power Meter that displays the actual output power.

Model Rating
Type Tube type integrated amplifier
Power Amplifier Unit
Rated output Stereo : 75W + 75W (2 Ω, 4 Ω, 8 Ω)
Input Sensitivity / Impedance Line : 2.5V/22k Ω
Phono : 2.5mV/47k Ω
Preamplifier Section
Input Sensitivity / Impedance Line : 450mV/22k Ω
Phono MM : 4.4mV/47k Ω
Gain Line → Preout : 15 dB
Line to tape output : 0 dB
<General>
Total harmonic distortion factor Not more than 0.5%
Speaker output 1 System x3 (for 2 Ω, for 4 Ω, for 8 Ω)
Input terminal Line-RCA : Route 6 (one Phono MM/Aux switching system)
Line XLR : 1 system
Power input RCA : 1 system
Recording output terminal RCA : 1 system
Pre-out terminal RCA : 1 system
Vacuum tube used Preamplifier section : 12AX7Ax2
Phono : 12AT7Ax2
Power Amplifier Part : KT88x4
12AT7x2
Power consumption 250W
Maximum external dimensions Width 445x Height 257x Depth 470 mm
Weight 35.0kg
Attachment Remote control