I had these McIntosh MI-200 Mono blocks professionally restored 3 years ago. I currently can not locate the receipt for all the work performed however I will continue to look.
Most if not all of the electrolytic capacitors were replaced and the top silver ones use the old covers to keep them all looking original. An internal ground switch was installed. One amp has different lettering and is likely a few years difference in production. I used these with Acoustat electrostatic speakers for awhile and the sound was breathtaking. I'm now using a highly efficient pair of horn speakers and I can hear some hum out of the horn speakers that I could not hear from the electrostats.Its not terribly loud however I sit pretty close to my speakers and its noticeable between songs. On one amp one of very largest transformers also vibrates and lets out a hum however not through the speakers.
I recently pulled out the receipt for work performed [which is now currently misplaced] and was surprised to read a ground switch was installed inside the amps. I never tried switching the switch to see if that had any impact on the audio hum I hear through sensitive speakers. The rack is not included. My Commitment is to Your 100% Satisfaction!Vintage Treasures At low Prices. I'm human make mistakes and not perfect please give me the opportunity to make things right if not completely satisfied. It is the star system at the bottom of the feedback page. If there is a problem with item please contact me before opening case or leaving dsr ratings! IF YOU ARE NOT PLEASED LET ME KNOW AND I WILL WORK TO MAKE IT THAT WAY.
The item "McIntosh MI-200 tube power amplifier mono blocks pair" is in sale since Friday, January 10, 2020. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps". The seller is "flukyfinds" and is located in Lake Oswego, Oregon. This item can't be shipped, the buyer must pick up the item.