I built the pcb version using 12AX7s and breadboarded the circuit using 6948s
Both oscillated! The first thing I normally suspect is myself until proven otherwise
Long story short I went over the circuit with a fine tooth comb nothing affected the oscillation in the power supply, the only thing I could get to alter the oscillation was tapping V1 pins 2 and 3
I had noticed that the tube filaments weren't exactly glowing in fact you could barely see them light up in a darkened room
So I thought not enough current to heat these beasties so electron flow ain't happening
I changed V1 from a Sovtek (admittedly taken from an old amp) to a JJ and the oscillation instantly dissapeared
I also changed V2 just because
I checked it in every possible configuration max gain, different amps, different guitars and pickups etc
I now have a very silent gloriously glowing gain machine that works as intended thanks
@vigilante398 and cheers for your time, teachings and quick responses it's very much appreciated
Here's a very short strum on my phone, no mics and no actual playing I had the fear getting too close to an unboxed HV circuit, gains maxed you'll hear very little circuit background noise all I do is 2 chords let it ring change pickups and tone on the pedal
drive.google.com
Obviously as you can see in the short vid title this is the Scottish version