I've had 3 Boogies and had problems with 2... I have to admit my Boogies weren't the high end stuff: I had a Studio 22, DC-3 and DC-5. the amps I had trouble with are the Studio 22 and DC-3. Both amps had trouble in the poweramp section. Do not know if it has anything to do with the fact that both amps use EL84 poweramp tubes. The DC-5 had 6L6 and everything was fine. Anyway, sold them all (after havin' repaired the faulty amps of course...). and probably will not use them ever again, mostly due to the fact that the company never replied to my mails. But then again, I live in Europe and I think they take more care of their US customers... Thank God the Hamer company is totally different!