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RF-7 Right Speaker Hum


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I have a fairly loud hum from the right speaker. Originally if I pushed down on top of the speaker it would dissapear for days. Now it is much more frequent but moving the speaker gets rid of it but in a few minutes its back again. Strange. Any ideas?

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I think I found the problem. I moved several of my components and when I put them back, forgot to reconnect the grounding wire I use between my tube pre amp and its powersupply. I'm still puzzeled in that I could eliminate the hum often by pressing down on top of the speaker or rocking it side to side.

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