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McIntosh MC2100 Stereo Amplifier 1960's Restored

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Pickup currently unavailable at SkyFi 479

Mcintosh Mc2100 Stereo Amplifier In Survivor Condition 1960S

McIntosh MC2100 Stereo Amplifier 1960's Restored

SkyFi 479

Pickup currently unavailable

479 South Broad Street
Glen Rock NJ 07452
United States


This is one of the first series of McIntosh Solid State amplifiers, designed and created with ideas and tech learned from their amazing tube amplifiers of the era. Produced from 1969 through 1978.

It resembles the MC240 or MC275 classic tube look, but with Solid State space-age technology of the day. 

Offering that sweet McIntosh signature sound with 105WPC, or 210W in mono in conjunction with 0.25% or less THD. That's with both channels driven and measured from 20 Hz to 20,000 Hz.

Please note our ratings scale is super conservative so we've rated this a 7 out of 10 even though it is a survivor based on 1) age 2) slight rust around the fuse holder. Otherwise the chrome, transformers, tube cage, controls, and overall condition is excellent.

This amp was restored where we replaced many components in the driver cards.  See pics. 

McIntosh MC2100 Stereo Amplifier - Owner's Manual

The SkyFi Testing Process for Solid State Amplifiers:
We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage Kef speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.

Technical Specifications
105 WPC stereo
210 W monoural

Frequency Response:
20 Hz - 20 kHz
(+0 – 0.25dB)


Noise and Hum:

Output Impedance:
4, 8, and 16 ohms stereo
2, 4, and 8 ohms mono

Damping Factor:

Input Impedance:

Input Sensitivity:

McIntosh Included Patented Features:
Sentry Monitor

Produced and Sold:
February 1969 - 1978

7-3/4" H
11-3/4" W
17" D

57 lb

SKU: 105197