Yank that tube and throw it away do not use it in the other channel. Purchase two new 6922s. If same problem, call Mike and he will ask you to send the amp to him for repair.
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I would contact the tube seller Jim McShane asap for help. The guy great with tube recommendations for gear. He handles new and old stock tubes. He's help me a bunch with preamp and power tubes for my gear.
If you can find them try Ediswan 6922 tubes from Upscale Audio. When I had a 6922 based tube preamp these Ediswan 6922 tubes added some nice sparkle and detail in the mids and highs in my system.
I swapped the tube to the other channel and the noise followed. So I am sure that it is the culprit. Amps will remain off until I find a suitable replacement.
@jednite, my amp uses one 12ax7 as the input tube paired with one 6922 as the driver. I read in an older thread that this configuration has it own sonic signature that means that I will not likely hear the full potential of 6922 but a mix with sound of the 12ax7.
So I a reluctant to spend a lot on NOS tubes if I won't hear the difference.
Has anyone experimented with different 6922 on their Quicksilver Midmonos?
It's funny that you ask because I just ordered a pair of RCA 12AX7As for my Mid-Monos. Mike at QS says that the input tube affects the sound more than the driver, so we will see when the RCAs arrive later this week. I have the very newest version, btw. If I cannot hear any difference, that will be that. However, if I can, I will play around a bit with the 6922s and test your theory.
Jim McShane carries many of the Gold Lion re-issue tubes including the 6922 sub. The sound should be considerably warmer than the usual Sovtek although both are Russian, NOS 6922s are expensive and difficult to get reliably- but if you want to look at some Upscale Audio is a good place to check out. It is clearly truw that no one knows your amp better than Mike Sanders so his advice is invaluable.
Thanks for the recommendations. In the end I heeded Bojack's, JPerry's and Mechans advice and I spoke with Mike Sanders.
I am really glad I did, he suggested that I change the input tubes as wells as the drivers. The end result was well worth the wait, everything sounds a lot tighter and more focused.