Hi,
I am trying to solve a problem that I am facing with this power amp. Both channels are working alright but there is a distinct buzzing sound from the second channel. Without any signal plugged in and with the volume totally off, there is still this buzz. It sound something like if a microphone cable shield is removed, you can hear a distinct buzzing sound. I checked to see if there is a break in the ground and shield connection, but it is intanct. This amp uses a single toroidal transformer, but separate rectifiers and filter caps for each channel. Can this buzz be coming from the power supply. Please advice.
Thanks
Carlos
I am trying to solve a problem that I am facing with this power amp. Both channels are working alright but there is a distinct buzzing sound from the second channel. Without any signal plugged in and with the volume totally off, there is still this buzz. It sound something like if a microphone cable shield is removed, you can hear a distinct buzzing sound. I checked to see if there is a break in the ground and shield connection, but it is intanct. This amp uses a single toroidal transformer, but separate rectifiers and filter caps for each channel. Can this buzz be coming from the power supply. Please advice.
Thanks
Carlos
Sounds like a duff filter cap then. Got an ESR meter to verify? Otherwise you can solder a suitable 1000+ µF cap in parallel to see who the culprit is.
If that yields no result, you'll need to go on hunting for grounding issues...
If that yields no result, you'll need to go on hunting for grounding issues...
Thanks alot sgrossklass. It was a filter cap. I replaced it and the amp is now OK.
Thanks again
Carlos
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