Had one recently and can't get more excited!
Restored Mac 1900 receiver -- GIANT KILLER
Purchased one at craigslist $180. After diagnosing unit at home of the craigslist seller, I talked down price from asked $400, because I spotted weak Left channel had lack of bass in both mode with or without loudness. One output transistor found weak with trivial diode test, but replaced all transistors to have them all same brand. Certainly checked proper voltages across driving transistors to make sure that they operate properly. Also sound-tested signal output out of driving transistors with specially modified headphones for signal tracing. After final assembling of transistors, I was still checking if they run too hot and after 3 hours of continuous playback I was able to touch transistors with bare fingers safe... Jumping onto this discussion back and wrote post of my own as well just because I'm super-excited that I did NOT resell it and still enjoying it so much! This receiver gives you nearly EVERYTHING for relatively small to medium room including clarity, precision, instrument separation and superb imaging.
