First I want to say thank you to runeight for the hard work designing this amp and glassjar for the kit! I just got the amp working yesterday and it sounds great!
Unfortunately, I do have an issue though. I am getting an annoying sound when the amp is on and I turn the volume knob or tap the tubes, or even move my hand across the desk that the amp is sitting on! Otherwise, the amp is very silent until I move lol, and its a little bit annoying which is unfortunate. I did some searching and while I couldn't find much useful, I think the term I'm describing is that the tubes are very "mircophonic." This is the standard kit from glassjar, same tubes 12au7, one says Bechman on it and the other RCA electron. When I remove the tubes and turn the amp on, I cannot hear this effect, but I do not know if that means anything. As far as a "hum" or "hiss" noise, the amp only does that very faintly at max volume (with the tubes in again) but that is being really nitpicky as I'll never get anywhere close to that volume with the headphones I have now with music playing, and even then its barely audible. This "microphonic" effect however is loud, and its a bit worse in the left channel.
Did I screw something up? Or is this a characteristic of the tubes? Thanks all!