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Sansui AU-517 VERY quiet output in left channel

pup.biz

pup.biz

New Member
Hi!
I just got a Sansui AU-517 on the cheap-ish, from the owner who seemed like he took alright care of it and said it was working fine. This morning I was playing a record and the left channel cut out.I turned the amp off and on again, and the left channel was fine, but then cut out again after less than a minute. This happens every time I turn the amp off and on. After some experimentation with switching the left speaker to the right channel / etc it seems like just the left channel is outputting a very, very quiet signal. Either speaker sounds fine plugged into the right input.

I haven't cleaned the pots yet (was going to do that right now), but any ideas on what could be wrong?

Thanks!
 
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Using deox (or similar), clean all the switches and controls. If it still acts up, it sounds like it could be the relay contacts.
 
Dirty pots/switches are high on the list as well as dry solder joints(google).
Some basic questions/things to try.

Does it happen with AUX, eg CDP or just PHONO
The amp has PRE-OUT/MAIN IN RCA's at the back so it can run with other
equipment as a pre or power. Set to either DC or cap coupled so the amp runs as
a separate, then connect an RCA cable from Left Pre Out to Right Main IN.
Likewise Right Pre out to Left main in, cables criss/crossed. If problem
stays with the left channel then its a power amp issue. Preamp and switches
if problem moves to right channel.

Tinker with some of the other switches like Tone Defeat/ON.

Also try selecting spkr A+B or maybe connecting your spkrs to B to troubleshoot
the sprkr selector.
 
I'll be going into the pots and switches soon and cleaning them all out with some deox-like spray I got from the hardware store. Also, @mbz, it does happen with multiple inputs (tried with both Aux and Phono-1). Also doesn't change when turning the balance knob or treble/bass controls, or switching the tone or sub-bass switches. Speaker selector switch doesn't change anything either, but I couldn't test the B speaker connectors because the clips are loose / need some minor work. Either way, A+B didn't solve anything. And I'll try the pre-out switching in the back! Thank you a bunch for the advice, super informative.

Also, an exciting update as of just now, the problem went away...
I'll be keeping a close eye on it and I'll still be cleaning the switches and everything. Thanks all.
 
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