I accidentally hooked up my old GFA 555 to my speakers with the mono switch engaged, this blew the right channel. my local shop repaired it twice and every time i get it back up to about 50 or 60 watts (guessing) the right channel goes out. i mailed it to "Inhouse Service Center in Seckaket, NY" . What are some educated guesses at what I did and what it needs now. It is a gfa 555 series 1 from about 1989. Which i purchased new and has never given me any problems. thks chuck
ps- while they have it opened up should i ask them to replace anything else to improve its sound?
ps- while they have it opened up should i ask them to replace anything else to improve its sound?
With nothing hooked up take a multi meter, and measure across the pos, and neg terminals. You know how to replace the fuses inside? For test purposes I recommend using lower amp fuses.
Sorry I can't help with suggestions on your problem, but I too have a GFA-555 with problems. Does anyone have the full service manual in PDF they can send me? With this popping the main fuse every time it's turned on, I think I'll need it 🙂 TIA.
Re: Help anyone?
The service clowns are probably buying counterfeit transistors for replacements...knowingly or unknowingly. The original outputs should be replaced with On-Semi MJ21193G and MJ21194G, purchased from a reliable source, such as Newark or Digikey.chucker said:
Adcom still enforces copyright on their manuals. Call them, they'll sell one to you.ZigmundRat said:
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