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Faulty Channel

poopytheboy1

New Member
I have been having issues with my HH Scott 370R amp, the left channel does not work properly, neither in the 'B' or 'A' speaker configurations. I sometimes play music through my alexa dot, my CD player, or my turntable... more on that below

The Problem:
When I turn the amp on, the music seems/is uniform. As time goes by, say 15 minutes to 40 minutes (depends), the left channel is either significantly quieter (especially when playing the alexa dot), or very distorted (typically when listening to CDs), or more often than not a combination of the two. This particular receiver has both left and right power meters, so you can actually see the discrepancy between left and right output, often times I can crank the balance to the left and turn the volume knob all the way up and still have virtually no sound coming from left channel, or just distorted crap. All these issues are temporarily fixed if i turn the unit off then back on, only for time to bring the problems back.

Looking for some potential solutions.. I drive KLH model 5s, its not the speakers as I have switched the wires.

FYI - I bought (overpaid but I wanted it) this unit recently from a guy who sells and fixes amps. He cleaned the power switch, did some minor maintenance/cleanup etc. but it is not recapped or anything special, but it should be noted its not a thrift shop find

any help is appreciated
 
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I would clean and work the controls again - all of them and use deoxit.

If there are speaker protect relays inside the unit I would try tapping these hard with a wooden stick while the unit is going - although if your discrepancies are showing on the meters the relay probably isnt the issue.

Given that the issue happens after the unit warms up I would suspect a small signal transistor.

Can you find and download the service manual? Does the unit have "pre out, main in" rca sockets on the back panel?
 
I would clean and work the controls again - all of them and use deoxit.

If there are speaker protect relays inside the unit I would try tapping these hard with a wooden stick while the unit is going - although if your discrepancies are showing on the meters the relay probably isnt the issue.

Given that the issue happens after the unit warms up I would suspect a small signal transistor.

Can you find and download the service manual? Does the unit have "pre out, main in" rca sockets on the back panel?


Thank you for the reply. The pre out, main in sockets are currently jumped. I have the service manual. Is there an easy way to test a small signal transistor without having to whip out the ol' breadboard?
 
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