Prototyping the pre-gain and tube (distortion) stages:
Building it:
Top-right is the 9V to 34V DC/DC converter that generates the plate (anode) voltage for the tube. It is based on a Linear Technology LT1615-1 DC/DC step-up converter. Top left is the tone stack driver, bottom left is the tube driver (pre-gain) stage.
The following picture shows a gut-shot of the completed pedal. There was no space left for a proper tube socket. I therefore decided to solder the wires straight to the tube's pins and hold it in place with a piece of folded sheet metal.
