The control PCB (the green board) is now free and you can back it away from the top panel of the Valvetronix chassis.

There's enough slack in the cables to comfortably work on both sides of the control board.

The pot in the foreground of this photo is the master volume control.

It's been causing the amp's sound to cut out and to only work on part of its rotation.

The pot has three solder points (right).

Here, the broken pot is removed and the circuit board's solder pads are cleaned.

This replacement pot has an anti-rotation tab that isn't used in the Valvetronix amps.

Twist off the tab using a small pliers (see right) so the pot sits flat against the amp's inside panel.

At the time of this repair, we only had a solid-shaft replacement pot on hand so we used it along with a set-screw chicken-head knob.

We now sell a knurled-shaft VALVETRONIX POT that can accept your original knob.