I just had these two McIntosh units serviced and partially-reconditioned. The MC2105 amplifier had some issues - switches, capacitors, etc. The C32 was thoroughly cleaned and I believe some rewiring had to be done to correct a prior botched repair. Both sound great now. Had them back from my repair guy for a couple of months before I finally got around to hooking them up and listening to them.
They sound splendid. No more noise coming from the preamp - the volume pots are all super quiet now, as well.
I have them hooked up to a pair of Klipsch RP600M speakers.
And yes, before you ask... I am using them FOR NOW to stream via Bluetooth from my phone and iPad. :D