PETE CORNISH: ST-2 (Colorsound Overdriver)

The Pete Cornish ST-2 is a Colorsound Overdriver with a few mods.  The ST-2 is intended to be a tone-shaper; it's not actually an overdrive.  So if you are looking for dirt, you have come to the wrong place with this one.  Although one can make a few tweaks to bring some dirt to this, but I'm not sure it would sound that great.  Could also make it a little hotter on the output by adjusting the gain of the op-amp, if you really want to push some tubes over the edge.

It has the usual Cornish buffer (two in fact) and an additional buffered/boosted output via an op-amp.   The power supply is a little over the top too.  Several feeds for different sections of the circuit.  

All of the extras make for quite a large vero layout, and after all it is really just a bass and treble control - I'll probably do a simplified layout at some stage with a single buffer, or maybe no buffer at all and a smaller power supply.  It should cut down the size and complexity quite a bit.

The wiring is for buffered bypass, which I don't mind.  It bothers some people... 

Schematic and tracing details can be found here, at Aion FX.  Instead of using this gigantic layout, maybe consider buying a board from Aion.  

PETE CORNISH ST-2 - VERO LAYOUT

ST-2 ON LTSPICE

As expected, there's a fairly standard bass/treble response

There's nothing to see on the output trace - no distortion on this one, purely tone shaping.

CORNISH ST-2 VIDEO DEMO