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McIntosh MC2505 Vintage Solid State Amplifier, Serviced and Very Clean

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Pickup currently unavailable at SkyFi 479

Mcintosh Mc2505 Vintage Solid State Amplifier Serviced And Very Clean

McIntosh MC2505 Vintage Solid State Amplifier, Serviced and Very Clean

SkyFi 479

Pickup currently unavailable

479 South Broad Street
Glen Rock NJ 07452
United States


Here we have a super clean MC2505 amplifier, recently serviced here in our shop, and working and running as it should throughout.

Featuring that signature vintage warm & sweet McIntosh sound as you would expect from other models from this era. 50W per side is perfect for getting the most out of your high efficiency speakers.

This is a very clean example with just about the best chrome finish you can expect.  The front glass faceplate is also super clean with only a few blemishes. Again, about the best we've seen.

A matching McIntosh wood cabinet is available for another $300. Please inquire if you're interested.

Click here to view and add our recommended Kimber Kable Speaker Cables.

Click here to view and add our recommended Kimber Kable RCA Interconnects.

Please see our photos or the linked manual below for full specifications. 

McIntosh MC2505 Stereo Power Amplifier - Manual

Notes from our lab:

This unit was recently serviced. One channel must have had an issue at some point in the past, and some transistors needed replacement.

One channel is running current production On Semi and NTE parts, while the other channel is running the original Motorola.

The small electrolytic caps on the driver and amp boards have also been replaced.

We reviewed all of the work carefully, and four it to be properly completed with quality parts.

On our bench tests both channels tracked extremely well for both output power and frequency response.

We completed some additional routine service which included the replacement of a burnt out lettering lamp, and converted the meter lamps to LED. We also calibrated both of the meters.

Some Cosmetic Notes:
• Some light black paint chipping around the headphone jack and other parts of the glass
• Some damage to speaker terminals blocks

** Note that the MC2505 vintage type VU Power Meters are not as bright as current production McIntosh equipment.

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.

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.



Original McIntosh Box

Yes - Brand New




Not Applicable


Yes - Power

Physical Condition


Working Condition


SKU: 102469