McIntosh MAC1900 - The Original High-End Stereo Receiver - Rare Survivor Condition


This is a super clean classic MAC-1900 in what we call rare survivor condition. This example appears to have all of its original parts installed and intact.

Most MAC-1900's suffer from having spent time in someone's damp basement resulting in light rusting, pitting, and component decay.

Not this one!

The McIntosh MAC-1900 is quickly becoming a great collectible piece, mostly due to its great features, solid tuner section, and amazing looks.

This example received a routine in-house servicing which included securing some broken rivets near the power supply fuses, a thorough cleaning, lamp check, and bench test.

This tested well on our bench clean up to 60W per channel into 8 ohms. AM and FM tuners were checked, and all functions tested and working to McIntosh original spec.

As with all pieces of this age, there are usually some quirks. Aging plastic parts in the switches have caused the stereo button to not engage on occasion. Just a little pressure to the left when pushing helps the button fully engage.

Original MAC-1900 Owner's Manual

Original MAC-1900 "If You're a Hurry" Guide

Tuning range: FM, AM
Power output: 55 watts per channel into 8Ω (stereo)
Frequency response: 20 Hz to 20 kHz
Total harmonic distortion: 0.2%
Damping factor: 50
Input sensitivity: 2mV (MM), 250mV (line)
Signal to noise ratio: 76dB (MM), 90dB (line)
Output: 250mV (line)
Speaker load impedance: 4Ω to 16Ω
Semiconductors: 3 x IC, 53 x transistors, 39 x diodes, 4 x thyristors
Dimensions: 15.99" x 5.51" x 15" (406 x 140 x 381mm)
Weight: 33 lbs. (14.97kg)
Finish: Black and gold anodized front
Production Years: 1972-1975

The SkyFi Testing Process for Receivers:
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. We run the receiver 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 receiver 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.

Then the tuner is thoroughly tested in our lab utilizing our professional Sencore SG80 FM Generator, which allows us to generate a reference FM signal of any frequency and amplitude, and then measure the resulting tuner output on our Sencore PR81 or oscilloscope. 

Final testing involves pushing actual music thorough the receiver 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 receivers will then move into our listening room where they are tested with our in-house reference speakers of choice.



Original Box

Not Included


Online Only


Not Applicable


Yes - Power Only

Physical Condition


Working Condition


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