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6922 Issues / Recommendations

I have a pair of Quicksilver Mid-Monos. After shutdown one of the amps produce a static noise through the speaker. Last night while shutting down in the dark I noticed some arcing inside the 6922 driver tube. I am assuming that this is the source of my problem.

My output tube are EH-KT88 and are about one year old. Based on past experience these tubes tend to last 2 years. The 6922 are the originals that came with the amp when I bought them new more than 4 years ago, they are Sovtek.

I guess I should swap tubes between amps to be sure to find the culprit. One more note, the amps play fine when on the problem only occurs after shutting off the power.

If my assumption is correct and I need to replace the 6922, what tubes do you recommend. Budget would be up to 100$.
nick_sr
bojack
636 posts
 
Nicksr,

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.
jperry
2,432 posts
 
Call Quicksilver. They will sell you the tubes for your amp at a reasonable price. Look at their web page for pricing.
mechans
3,048 posts
 
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.
oddiofyl's avatar
oddiofyl
3,468 posts
 
The Russian "rocket logo" 6h23n is a great tube if you can find them....rugged and sound great
ptmconsulting
1,000 posts
 
You can obtain the Russian Rocket Logo's directly from sellers on e-bay. These tubes are even better after croying (it smooths them out somewhat and they soound more open to boot).
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