McIntosh MC2505 Solid Stage Vintage Amplifier - Serviced

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Nice 50W amplifier from McIntosh perfect for powering vintage or high efficiency speakers.

We were playing period-correct hits from Frank Sinatra and I was personally mesmerized at the spaciousness of his voice against the orchestra. Even at low volume.

Featuring gorgeous traditional blue meters like most desirable McIntosh amplifiers.

Serviced in house and ready to rock and roll.

SkyFi Service Notes:
• Controls cleaned.
• All capacitors checked.
• Select out of spec capacitors replaced.
• All brown small signal transistors were replaced with modern substitutes.
• DC offset adjusted.
• Both channels test clean to 50W into 8 ohms.
• Meters calibrated.
• Power cord replaced. 
• Lamps replaced w/LED.

Cosmetic Notes:
• Early version of MC2505 w/ Meter bezels.
• Chrome has some pitting.
• Power transformer and heat sink grill have some rust.
• Glass shows some imperfections.

A matching McIntosh wood cabinet is available here:

https://skyfiaudio.com/products/mcintosh-l12-wood-cabinet-slant-feet-w-10-or-12-adjustable-panlocs

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 - Better 

Kimber Kable - RCA Interconnects - Best

Kimber Kable - Speaker Cables - Better

Kimber Kable - Speaker Cables - Best

Kimber Kable - Bi-Wire Speaker Cables Best (If Applicable)

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

McIntosh MC2505 Stereo Power Amplifier - 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.