McIntosh MC501 Power Amplifiers w/ Consecutive Serial Numbers

For your consideration, we have a pair of Mcintosh MC501 Amplifiers in very good condition. We acquired the amps, along with an Audio Research 5SE Preamp from an audiophile customer who used them to run a pair of Sonus Faber Stradivari Homage speakers. The amps were originally bought as a pair as their serial numbers WU1714, and WU1715 indicate. 

We picked up the amps from the original owner's new house as they were moved from his previous house.  When we got them back to our shop and on our bench, we opened them up and visually checked them out for any signs of heat stress or bulging capacitors. Both amps were extremely clean. We adjusted the bias on both amps to factory spec and then moved on to testing.

In order to test the output and check to see that each amplifier was in proper working order, we hooked them up to our Sencore PA81 Stereo Stereo Power Amplifier Analyzer acting as a dummy load and Oscilloscope interface. Using an audio generator, we ran a 1k signal through the amps input, slowly increasing the amplitude while monitoring the output on our oscilloscope for signs of noise, clipping, distortion. They both checked out perfectly.  Following testing, we ran music through the amps  on our bench, and then in our house system for about a week running daily for 8 hours a day. They both performed flawlessly.

The amps are both in good physical condition, with some blemishes.  Of note, there are some scratches on the aluminum trim pieces, and the top transformer covers have some small indentations. We included close up pictures of the blemishes in the listing. Please see the many pictures in the listing for further details.  

The amps will ship via freight stacked on a pallet in brand new factory Mcintosh boxes to ensure safe travel. Fully insured freight shipping charges with liftgate are $750.00. Free local pickup is also an option.

Performance Features:

• Full Balanced Quad-Differential Circuitry
The MC501 is fully balanced from inputs to outputs. It
consists of two matched power amplifiers operating in push-pull with their outputs combined in a McIntosh Autoformer. The double balanced configuration cancels virtually all distortion.

• Patented Autoformers
The McIntosh designed and manufactured Output
Autoformer provides an ideal match between the amplifier output stage and speaker loads of 2, 4 and 8 ohms. The Autoformer also provides perfect DC protection for your valuable Loudspeaker.

• Patented Power Guard
The patented McIntosh Power Guard Circuit prevents the amplifier from being over driven