audio research sells tube dampers - at ~$5 a whack, it mite be worthwhile checking out....
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there are some black rubber rings already on the tubes. I asssume they are tube dampers that you refer to. They don't seem to make a marked difference in the microphonics of these tubes, at least as far as I can tell. I thought that would be the solution too, but when I took off the cover, those guys were already on the tubes! Are some brands less microphonic than others as a rule? thanks again for your response
Being new to tube equipment myself, I've researched this issue. It seems that there is quite a bit of variablity from tube to tube as far as microphonics and noise. Especially among certain nos tubes. It would be woth your time to go to www.vintagetubeservices.com and read what Andy has to say about these matters. He tests his tubes for these problem areas and grades them accordingly.
i'm w/photon46. my toob experience is wery limited - only w/preamps w/the 6sn7 toob, & the 6922. i found the 6sn7 to be a lot more microphonic than the 692 regardless of which mfr, & i had 3 different types of 6sn7 & 3 different types of 6922... not familiar w/the 6gk5, but andy at vintage tube services is good. i also like bruce wenger at www.bws-tube.com
good luck, doug