Power Control Unit.
A nasty overdrive with germanium or silicon diodes.
The circuit was originally developed as a custom overdrive for my friend Guille Holgun (the talented @alcatrazzdevil on Instagram). He wanted an alternative to the billions of klon clones, modded tube screamers, bluesbreaker with extra diodes...that was the birth of the Devil Drive.
I kept on working on that circuit, trying to get some warmer, yet fully driven, sound...and here we are, Power Control Unit.
To give it some extra coolness, we retrofitted the circuit into a 1958 model train power transformer (something we learnt from the awesome guys at Bad Penny FX).