Short answer:
Omit Sundial pot
Install wire jumper across pads 1 and 2 of Sundial control
Long answer:
The Sundial is nearly a necessity on vintage PNP transistors, because Germanium transistors vary widely in gain with small changes in temperature. The Sundial is only somewhat useful on...
I would like to use the sunflower PCB with BC109 NPN transistors. What changes are required?
Obvious changes:
- No need for a -9V generator, use +9V from SW instead
- polarized caps need to be reversed
- no sundial needed
Am I missing anything?
You could also make it (Ge | no clipping diodes | Si), which is what the Soul Food meat and 3 mod does. Ge clips sooner than Si, so the sound is more compressed. No clipping diodes is a more open sound which only clips when you overdrive the op amp.
I am using an OPA2134 in the left side of my KoT, it has a nice clean distortion that isn't spitty or crackly. It is perfect for fattening up a single coil without adding grunge. I left the 4580 in the right side. They sound great in tandem.