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Adam, it happened to be a JJ 5U4GB, though I don't think the brand of the rectifier tube makes that much difference. It was the most reasonably priced and fastest availability. While I have the effects loop hooked back up I still have not plugged in the PITA foot switch. While it's a beautiful...

Yep. Like crawling underneath a kitchen sink to change a P-Trap. And V1 is the one I want to experiment with.

Good news! Replaced the 5U4 yesterday. Four hours last night and another three hours today. All quiet as a church mouse (though I've never really heard one). So the static and noise was coming from the rectifier tube. Wouldn't you know it. The thing that fixes the problem is always the last...

Adam, mine can act the same way.... like the problem is aggravated when I start playing. However, it will also make static when idle.... with the input unplugged and standby is on. Some of the other things I tried; Many of the jacks are used as switches. I exercised all of them several times...

No, this has nothing to do with what I had for breakfast. Also, this has nothing to do with the foot switch. It is unplugged and bypassed. After the amp is on for a while, especially after its been played, it develops static and crackle and a few pops. It's sporadic. It will be quiet for a while...