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In Reply to: RE: Fixing 70s solid state amps and receivers and common problems. posted by Michael Samra on January 07, 2015 at 17:16:04
I've found 70s SS receivers to be more complex with many more switches that get dirty and fail.
I recently fixed a bad right channel on a SX-838 by cleaning the switches. I think this unit had sliders, toggles and rotary switches and 5 or 6 pots for tone, volume, balance.
looking for some jazz and a little libations - joe strummer
Follow Ups:
I've found 70s SS receivers to be more complex with many more switches that get dirty and fail.
That happens as well..I was referring mostly to low volume in one channel and many times that turns out to be a small electrolytic used in coupling or emitter bypass,
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
I had a SAE pre with about 20 bad electrolytic caps. The caps were so bad the protection relays would start to cycle.
looking for some jazz and a little libations - joe strummer
I hear you..THe Sansui 9090DB I had worked on a few years ago would go into shut down and I had recapped the driver boards and that cured it..The ESR meter was a lifesaver.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
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