jvstratman
Well-Known Member
One of my 400's has a slight hum upon power up. It's immediate upon switching on. It doesn't get louder or go away. It's annoying between tracks.
What is the best way to troubleshoot/isolate components? This receiver doesn't employ the metal cover on the rear of the on/off switch. Could that have any effect?
I was contemplating lifting all secondaries to see if it dissapears but, don't know if that is safe for the xfmr.
Any thoughts/guidance is appreciated.
Btw, I've installed the surge protection component per sticky thread on both units. One hums and the other is dead quiet. Also, no rust at all on xfmrs.
What is the best way to troubleshoot/isolate components? This receiver doesn't employ the metal cover on the rear of the on/off switch. Could that have any effect?
I was contemplating lifting all secondaries to see if it dissapears but, don't know if that is safe for the xfmr.
Any thoughts/guidance is appreciated.
Btw, I've installed the surge protection component per sticky thread on both units. One hums and the other is dead quiet. Also, no rust at all on xfmrs.