Hand built in Atlanta, the Goodsell Super 17 MK IV is a lot of amplifier in a compact 1x12” package. It takes inspiration from several classic amplifier designs with a tube driven spring reverb, Gibson inspired bias-vary tube tremolo, and a Fender ‘59 Bassman inspired cathode-follower powered tone stack. I got hip to these after seeing Robyn Hitchcock at the now defunct Exit/In and Peter Buck was using one on stage. Richard Goodsell has a very detailed history on his website here.