I miss the MC2100...
A few years back I borrowed my brother's mint '76 MC2100 while he was using two MC250s strapped in mono (one of them mine) for his audio system. The MC2100 sounded no different to my ears than my trusty MC250...I suppose because it was driving my 98.5dB efficient Klipsch Cornwalls, which obviously was overkill for the horns. In any event, both vintage Macs sounded awesome through the Klipsch; their output autoformers being the reason I think why they sounded so warm and tube-like. Dammit, it makes me so mad I was laid off and had to sell everything I owned (only the Cornwalls survived)! Maybe someday I'll tire of my inexpensive Hong Kong-made 300B SET amp, save up some money, and buy another McIntosh (either an MC250 or an MC2100...the best vintage SS amps money can buy IMO)!
Enjoy your "new" Mac...UPS can't get there soon enough, I'll bet.:thmbsp: