It's done it since day 1. It's been rebuilt, every cap (except the tuner ceramics)has been replaced with good films(ecq, dme, mkp's,715p's) and lytics (Nichicon upw/ukl), all of the signal tubes replaced along with about 2/3 of the tuner and MPX tubes. Don't get me wrong, it runs fantastically good, and is now not any hotter than my 800c due to some mods to the power resistors, and HVAC aluminium tape on the transformer sides that face the tubes. OPT Tubes are Tungsol 7591 ReIssues with the smaller original sized bottle. I listen to a lot of radio, so it's not really a problem for me here, but if I listen to a tape, then go back to FM it has a nasty POP! I've gotten to the point of turning the spkrs off, switching to FM, then turning the spkrs on. Around the switches its a briar patch! Brer Rabbit would love it, but I ain't jumpin into no briar patch!!!