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Slight hum from SLI-80 power amp

I own an SLI-80 Amp for a little over a year.  My system has developed a very low, slight hum only on the right channel. One has to get right up to the speaker to hear this hum, but it is still a hum that should not be there.
Any ideas where I should start looking to eliminate this hum?  Thanks
128x128richfrank
sfar's avatar
sfar
1,758 posts
 
The first test I would do is to one at a time swap the matching pairs of tubes left to right and see if that switch moves the hum.
jtcf's avatar
jtcf
1,617 posts
 
A loose or dirty cable connection could be the culprit also.If the tube swap gives no results try cleaning all of the connections.
richfrank's avatar
richfrank OP
34 posts
 
SFAR & JTCF: Received both of your suggestions and will follow your advise. Will report back later. Thanks.
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