It sounds likely the be the balanced / unbalanced switch. They can get oxidized. Ideally you would flip it back and forth 40 or 50 times and see if that rids the contact of oxidation. If it is loose, would be best to tighten it first. If the switch is falling apart this might break it completely... although it may need replacing anyway. Anyway, that is what it could be. You are a better judge of what you can do. If you tighten it inside... make sure it is off and stay away from the capacitors and circuits for a while as they could carry a charge. I'd wait at least an hour after unplugging to poke around inside. And if you're going to be near the capacitors overnight to be sure.
Intermittent electrical buzz through speakers, seems to be amp
Hey all, would love to get input from those who are more skilled and knowledgeable than I am.
So I recently got a used Primare a30.2 and have been thoroughly enjoying it. However, about a week ago, an electrical buzz started coming from my right speaker. I did everything I could, through process of elimination, to determine that it is indeed coming from the amp and from the right channel (checked components, cables, power supplies, and switched speakers and speaker cables around). I have very little skill or knowledge in regards amp or audio component repair. I did open up the unit and ensure it looked clean and in tact inside (it's pretty pristine in fact!). I also checked the transformers were snuggly secured.
The buzz is intermittent and usually starts within a few minutes of playing music through it. It has a distinctly electrical quality to it though will sometimes turn to an almost pink-noise sound. Power-cycling gets rid of it temporarily but it's usually back within a few minutes. The buzz definitely sounds electrical and it's pitch and volume changes over time (though it isn't effected by the gain/volume level of the music).
The one aspect of this used a30.2 that I suspect *could* be the culprit is this: the switch that toggles the right channel to accept a balance or unbalance input seems to be loose (it's switched currently to unbalanced but not "confidently" so). I unfortunately don't currently have any balanced components or cables with which to test this further.
I realize I should find someone locally who can diagnose and repair this but since money is tight right now, I'm hoping there might be something I haven't tried or considered.
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