Thunderclaw

Jack Deville calls the Thunderclaw "a pressure washer spraying napalm," and that tracks. Bridge humbucker in drop tuning gets you instant Mastodon; flip to the neck pickup and you are in Kyuss territory. MusicRadar gave it 4/5 with the summary: "versatile selection of great stoner tones."

The circuit borrows the RAT's input-stage-into-diode-clipping concept but diverges from there. A bipolar charge pump generates +/-9V internally—a technique borrowed from pro audio preamps, not typical pedal design. Two cascaded Baxandall-style active EQs (Bass and Treble, boost/cut around noon) give far more sculpting range than a single tone knob. Active volume output keeps impedance constant regardless of level. The whole thing draws just 27mA.

True bypass. 9VDC center-negative, ~27mA. Input impedance ~480KΩ, output ~1KΩ. Handmade in Portland, Oregon.