My lead dress may not be the prettiest I’ve ever done, but I’m not having any noticeable hum or noise, and I can’t get anything to show up on the scope that looks like extra noise being picked up anywhere.Yeah, I was considering ultra-sonic oscillation as a possible cause. Not only reversed OT primaries, but also the lead dress. You can get away with way more when using PCB's, so maybe converting to hard-wired has caused problems. I was also curious about C23 (470pF) going to ground from the V4 grid stopper. Did they do that because of an oscillation problem even with a PCB?