McIntosh MC300 Solid State Stereo Amplifier - 300W!


The McIntosh MC300 - capable of driving the most difficult loads.  

In great condition with no signs of use or abuse. Fully tested and all bulbs replaced.

McIntosh MC300 Solid State Stereo Amplifier - Owner's Manual

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects

Kimber Kable - XLR Interconnects

Kimber Kable - Speaker Cables

Kimber Kable - Power Cords


Power Output:  300W x 2,  600W x 1 
Frequency Response:  20-20kHz (+0 -0.25dB)
Total Harmonic Distortion:  0.005%
Noise and hum:  -105dBA
Output impedance:  2, 4 and 8 ohms. (1, 2, 4, 8 and 16 ohms in mono)
Damping factor:  40 or greater
Input impedance:  20k unbalanced, 40k balanced
Input sensitivity:  1.4v.
McIntosh Sentry Monitor
McIntosh Power Guard

Glass panel, Illuminated
Power level meters (linear watts or dB)
Meter Switch:  Watts or hold
Power Guard lights
Power Switch:  On or off/remote

Output barrier strips
Gain controls
Audio inputs:  Unbalanced RCA and Balanced XLR.
Mode Switch:  Stereo, mono bridged or mono parallel
Power Control jacks:  In and out

Dimensions:  7-1/16" H, 17-1/2" W, 17-1/2" D
Weight:  79 lb
Sold from:  1995-1998

Click here for a PDF copy of the Owner's Manual

Click here for a PDF copy of the Service 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.



Original Box

Yes (On Order)






Yes - Power Cord

Physical Condition


Working Condition


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