Filthiest preamp/fuzz/distortion builds?

Hello folks!

I took a pedal building hiatus (over a year) and am getting back into the swing of things. I’m looking for recommendations on the filthiest fuzz/distortion/preamps.

Recently got a pedal baby and looking for absolute filth to drive a 4x12 cab loaded with V30s and creambacks. I’ve already built a sanguine distortion and a thermionic distortion which were awesome but looking for more grime.
 
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