Vacuum Tube distortion module.

This is the PCB and Panel for the Safety Value design that Sam posted at Look Mum No Computer. In this case a chopped off version with 10HP. Panel design by Sam Bartle.
As with all vacuum tube based designs, this module is very sensitive to noisy power supplies. In addition because of the tube based circuit initial power draw is significantly higher than the spec on both rails (by about ~150mA), but should settle down as the tube warms up.

www.lookmumnocomputer.com/the-safety-valve/