copying the important parts of the article in a verbatim manner: "Both Thompson and Root said that when they recorded the band’s first album, their choices in gear were very limited because they couldn’t afford anything other than what they already had. Thompson used a Rocktron Piranha pre-amplifier powered by a Mesa Boogie 295 power amp."more
Difficult to find something similar to this one-rack unit nowadays... All analog 250 Volt 2x12AX7 tubes preamp with three channels: Clean, Classic distortion and Modern distortion, plus an active EQ with parametric mids and 99 programmable MIDI banks. It also has effects loop and built-in HUSH noise gate. If I ever decide to trade it for another gear, I would need three or four pedals like distortion, EQ, boost and noise gate.