Absolutely change the 6922 in the front end.  That's the only way you'll know if that's the problem.  Also wouldn't hurt to clean your input jacks and tube sockets.

Steve

Never underestimate the ability of a slightly loose pin jack in the tube socket to cause mysteries just like this. One of the pin jacks could have loosened from a crooked tube pin, or maybe a dust mite crawled in there and died, who knows? Sometimes swapping tubes fixes it because there is some difference in pin straightness between the comparison tubes or some non-conductive deposit in just the right place somewhere.  

Before tightening the tube socket, I'd first clean both the socket and tube pins with Caig Deoxit, and then coat them with Caig Progold. When first cleaning with the Deoxit, it works extra-well to spray the stuff on and let it sit overnight before wiping off and applying the progold.

If that doesn't do it, then tighten the tube socket jacks. I do it with a sharp but smooth metal point like an oversize sewing needle while looking with a manifier glass. Make sure the amp is off a day or two as you can get a significant capacitor zap if you ground to something while doing it.

Karl

I would like to know how the cleaning works out
Maybe the tubes I was using just were a little oxidized. I did not use any contact cleaner and maybe I should have.

Best of luck and may a cheap fix prevail!

Gex

Although I expect Mr. Deckert might be a little busy during the Decfest I wanted to relate my recent experience with his repair policy.

I had issues with two Decware components and dropped by expecting to be leaving them for repair and picking them up at the Decfest.  Surprise, he had me fixed up within thirty min. and on my way.

I understand that most folks do not have the luxury of being able to make a trip to Peoria for this type of thing but my point is that Steve stands firmly behind his products.  Warranty service don't get any better than this.

dennis

thirteen valves glowing in Decware products as we speak.

In my case the other tubes solved the problem but if the time comes available I might pop the hood as you say.

gex