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In Reply to: RE: Had a preamp that made an awful hum in one particular system... posted by David S. on February 16, 2017 at 12:28:39
I have tried lifting the ground. No effect.
This is pretty much a standard procedure prior to sending anything off for repair.
I'm not sure which/if any of the tubes would affect both channels as I am not familiar with that pre-amp.
However I and other posters here have experienced hums which will disappear when tube pins are cleaned. Tube socket contacts should be cleaned and tightened as well.
Care must be taken if you are not familiar with this process. You can try a search here regarding maintenance of tubes and sockets. There's a great bit of info by Jim McShane in the FAQ section. You might also try posting your issue in the tube forum.
Good luck and let us know how things go.
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Thanks Jonesy. I am certainly not an electonics expert but I dont think a bad tube on either side would cause hum in both. I have cleaned the pins and sockets and the 6v6 are new. The 6922's are ElectroHarmonix and the were in the unit when I purchased it. I was told they had about 100 hours on them. I have two other sets of 6922's and it doesnt really change when I swap them out.
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