I just used an MCS 3275 as leverage for getting a Realistic STA-95 repaired.
There is a shop near here, that I frequent. I get free repairs on equipment I want, by trading their labor for equipment that I DON'T want. The MCS 3275 indeed had a sealed volume unit, which I believe was the source of the problems with my particular unit. I don't know who made the MCS 3275, but I think we can all agree it was not JC Penney. Easily the largest 75wpc receiver I have ever had, it is outperformed by smaller, less cumbersome, and less powerful offerings from other manufacturers. This would include the 65wpc Realistic STA-95, which is now in perfect working order. Think I'll swap it out for the 38wpc Nikko 715 I have driving KLH Model 6's in my daughter Tiffany's room.
Almond, Toasted/MSgt, USAF