I took a risk on this setup sight unseen today - MC752 amp and C26 preamp. The seller didn't know if any of it worked (estate sale flipper type), was unable to hook it up (not a clue how it went together), and wasn't able to audition it (no speakers, source, or cables). It was a take it or leave it deal and I'm glad I took it.
Long story short, the only flaw is an extreme amount of static in the controls and one burnt out bulb. I think a new bulb and some deoxit will make it as good as new. The speakers are XR-14's. At first blush, it seems really lush and crisp. A McIntosh setup is high up on my wish list, and hopefully this one will be a keeper.