James Engineering, LLC

I get asked all the time how to fix Fender Tremolo thump, especially in 6G2 Princeton amps, so here's how I do it:
For trem thump: Diode across the outer lugs of Intensity pot. (Note polarity in the pic)
For trem pulse: this is actually interference, and is commonly picked up crossing the board to the grid of trem oscillator side of the second preamp tube. I use shielded wire from the Trem signal input, and it works every time.
I usually just use shielded wire anytime I run lead wire across/under/over the board. It prevents interference from getting into the signal and helps keep the noise floor down.

Inspecting some more builds, and letting lacquer dry over the long weekend.

I've got lots of help getting amps ready to ship.