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
