Dr. Boogie in the 2020

[JackSkellington]

Thanks.
My Dr. Boogie works at 9v and the drain voltage setting is about 4.7v. Not oscillation problem for me. I got it, but I solved easily.
After some experiments I didn't get a lot of dynamics, but it's fine enough for this pedal. Not really touch sensitive, but I guess this is the circuit.

[Zerro]

There are caps 1uF in source electrodes (emitors) which define gain of stages. Serially with (some of) them you can add resistors cca 1kOhm, so it will lower overall gain according your needs. This is way, how some valve stages define gain too.

For wheening oscilations I would add caps 100nF to power output point. See picture.

[JackSkellington]

I experimented on the filter in the power supply section, but my initial oscillations issue was caused from the layout design.

I tried to change the value of the 1uF caps, but in the end I like the original. It was more difficult to include resistors in the veroboard layout I used.
I included a three way switch to change the value of the cap in the first stage.

[Zerro]

Sometimes is enough to set there this serial resistor only at first stage.