A 38 year old Technics SA-500 receiver is my latest toy. Has a couple of minor issues, and it's just insanely dirty, inside and out, but the only thing that crackles or crunches is the tuning cap below 94 MHZ. All the switches work and feel great, and it sounds fine. It seems to be running warm due to the fuzz and junk stuck to every surface inside it. The wood looks very good, and other than cleaning and deoxit on the tuning cap, all the dial bulbs (New LED ones came today), all I'm planning on doing inside is to change out the main filter caps and probably all the rest of the electrolytics on the amp board, since there aren't all that many, and they are cheap.
Now I'll see if I get the Realistic SA-820 and Mitsubishi DA-R10...