I have a Adcom GFA-2535 amp. It is basically a pair of two channel amps (about 60 watt / channel). That is, there are two seperate power supplies for each "stereo amp".
Well, rather suddenly amplifier A did not work - both channels went bad. The voltages rails on amp B (the side that works) measure +/- 47 volts at the fuses. On amp A (the bad side), the rails measure +/- 49 volts.
Then I looked at the outputs for DC. On the good side (amp b) the two channels measure about 15 - 25 mV DC. However, on the bad side (amp A), the speaker outputs measure 4.5 and 30 Volts DC. Fortunately, no speakers were harmed.
Does any one have a service manual (pdf) for the Adcom GFA-2535. I had thought about checking the likely culprits by measuring on the good amp and comparing them to the bad amp. But that could take forever.
Thanks,
-Tom
Well, rather suddenly amplifier A did not work - both channels went bad. The voltages rails on amp B (the side that works) measure +/- 47 volts at the fuses. On amp A (the bad side), the rails measure +/- 49 volts.
Then I looked at the outputs for DC. On the good side (amp b) the two channels measure about 15 - 25 mV DC. However, on the bad side (amp A), the speaker outputs measure 4.5 and 30 Volts DC. Fortunately, no speakers were harmed.
Does any one have a service manual (pdf) for the Adcom GFA-2535. I had thought about checking the likely culprits by measuring on the good amp and comparing them to the bad amp. But that could take forever.
Thanks,
-Tom