I am now faced with possible restoration of my GFA-5802; after 20 years, it is getting a little grumpy, insisting I wait longer and longer to warmup to its sweet spot. Sometimes I must cycle the switch when the left channel decides to lie down on the job. I am not sure how major the causes will be, perhaps just a tune-up and refreshing any marginal components will restore a smile to its front panel. [Looking for recommends for Seattle people to advise and execute repairs.] While most would recommend a full restore, the original quality has proved so stable and great sounding that less 'improvement' might be more. There is no visible deterioration of the electrolytic caps.
My unit has all 32 output MOSFETs labelled Harris. Most pictures I see are one channel Harris and the other IRC. Is there any information hidden in this observation that could identify build date or repair status.
TIA for suggestions and probable cost estimates. I so enjoy this amp that I will do all necessary to keep it in the family.
My unit has all 32 output MOSFETs labelled Harris. Most pictures I see are one channel Harris and the other IRC. Is there any information hidden in this observation that could identify build date or repair status.
TIA for suggestions and probable cost estimates. I so enjoy this amp that I will do all necessary to keep it in the family.
rayma, I use it irregularly, and it is mostly left on. I haven't noticed any excessive heat in the sinks. I mostly listen through phones these days.
Ok, that probably means the caps are degrading if it is always on, but there's no real need to do anything specific,
if the caps look ok. Have you checked the bias setting? Maybe you're hearing the bias creeping up to nominal.
Are you sure you want to keep it? It's best to sell it while it's still working ok. You sure don't need it for headphones.
if the caps look ok. Have you checked the bias setting? Maybe you're hearing the bias creeping up to nominal.
Are you sure you want to keep it? It's best to sell it while it's still working ok. You sure don't need it for headphones.