A preamp from the Sunn Beta Lead Amplifier in a pedal.
Based on the PCB from AionFX
I did a custom build of one of these, and built an extra one.
TBH I'm quite temped to keep it, so if it's available don't wait !!
[UPDATE - It's sold]
Have three faceplates left, so if there's interest I'll build a couple more.
(Hit that "notify me when available button" if you're interested, and I'll build more)
It sounds awesome, brutally thick fuzz walls and gnarly as hell.
FYI, if you turn the treble and gain all the way up you will get feedback.
There's a treble limit trimmer on the PCB you can adjust to limit the range of the treble knob, so it doesn't feed back. There is also a small amount of switching noise in the noise floor from the switching regulator, even when you run it clean. Not heaps but it is noticeable.