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a new amp hum problem...checked the archives

Recently, I purchased a new amp. It hums. Not just the speakers, the amp itself. The only thing I haven't done is open the amp and tighten the screws. Here's what I have already checked out -

Disconnected everything from wall except amp, then disconected everything from amp except speakers. So the only players are the wall, the amp, and the speakers. Tried a cheater plug - no help. The amp still hums and the speakers still hiss. I've plugged the amp into different outlets on different circuits - still hums.

I have noticed that the hum and hiss seem to cycle a bit - it appears to get louder and softer, but I may just be crazy. I love the sound of the amp, but can't live eith the hum. If it's an electric problem, why doesn't it affect anything else? Didn't affect my receiver (which is now a preamp). I have a HSU Research amp for my subwoofer that used to hum, but (I know, I know...) a cheater plug solved that problem. I don't know what to do.

I am very frustrated and need your help.

Thanks,

Dan
dklap
dklap OP
49 posts
 
here's the next question. i decided to further tighten the transformer to the chassis and the hum has diminished significantly, but not completely. the question now is how tight can you make it? if i tighten it anymore, i am worried i may damage the transformer. any guidelines on this?

thanks
-dan
natatmvs's avatar
natatmvs
7 posts
 
I had a similar problem with an amp. As it broke in the hum disappeared. Maybe you should just let it break in like I did which is a very simple solution and see if that helps.
dklap OP
49 posts
 
anyone know about the ah! ac offset killer? how it works? a less expensive alternative? still can't kill the hum.
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