McIntosh MC75 Vintage and Restored Tube Monoblock Amps - 120 / 240V Capable

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This is likely one of the cleanest sets, if not *the* cleanest set of vintage MC75's you'll find online today.

Fully restored both cosmetically and electronically, and working absolutely like new (or better!).

These amplifiers are both the later production version which employs a dual primary power transformer. This means that they can be configured to work on either 120V or 240V power.

Also included with your purchase are official new McIntosh double-shipping cartons.

Restoration Notes:
This set of MC75's underwent a full restoration before our ownership which involved the following based on our inspection:
• Chrome chassis replacement.
• Transformers and bottom covers repainted.
• Full power supply and bias supply rebuild w/ quality components from Authenticap and Sprague.
• Signal Path Capacitors Replaced with Polypropylene film and Russian PIO.
• Select resistors replaced.
• Output terminal blocks replaced.
• Power cords replaced with 3 prong types (Ground not connected - This maintains the original wiring scheme but forces proper hot/neutral connection at the outlet)

Cosmetic Notes:
• Amp B has a very slight dent in the chrome near the output tubes.
• Amp B McIntosh 75 Badge is missing the lower part of the "7"
• Both amps have very light wear to the top of the transformers

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

Select Series Balanced XLR Analog Interconnects (Pair)

Select Series KS1016 Copper RCA Analog Interconnects (Pair) - WBT Connectors

Summit Series Monocle XL Speaker Cables (PAIR)

Summit Series BiFocal XL Bi-Wire Speaker Cables (PAIR)

The SkyFi Testing Process for Tube 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 tubes are inspected for signs of stress overheating or cracking.

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 it all looks 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 the 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 also be tested.

We also test all tubes for output gain and leakage on our calibrated modern and professional tube tester against the original manufacturers specifications. If needed, the tubes will be replaced from our vast NOS (New Old Stock) vintage or modern inventory.

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.