Hello guys,
I have had this issue on and off with my amplifier. Sometimes it sounds like a piece of paper flapping in strong wind, and other times, just a common white-noise electronic buzz. This occurs when disconnecting the device from my source, so that's not part of the issue.
I have purchased additional 12AU7A tubes to see if the problem still persisted, and it does (I'm pretty sure its relevant to the 9-pin area) for one odd reason. If I put pressure on the tube in a pinching motion (little to no pressure, just making contact with the sides of the tube with my finger) the static stops. I've checked all of my solder points for cold solder joints, and redid all of them just to knock it out of the way before posting this, and the issue still persists.
I've tried moving my amplifier away from any other electronic devices (4-5 feet away from anything) and it still occurs, I have no idea where to begin troubleshooting this or enough knowledge as to what may cause such a thing.
Any assistance/guidance would be much appreciated.