DIY Musical Instrument Electronics Builds By Charlie Escher
PW100B Tube Amp:

100 watts RMS, 4 x EL-34, 1 x 12SL7,
2 x 12AU7
Rack
Format Bass Amp :

Passinwind PW8B: solid state, 500 watts @ 4 ohms
Medium Size Format Bass Amp:

Passinwind PW8B v2: solid state, 650 watts @ 4 ohms
Rack
Format Bass Preamps :
Passinwind
4B: solid state, Fender passive tone stack
Passinwind
5B: solid state, active Baxandall tone stack,
effects/aux mix section
Passinwind 6B: tube, active
bass/mids, passive treble; 1-6SL7,
2-6SN7s in Aikido topology
Passinwind
7B: solid state, active bass/mids, passive treble,
effects send, effects return/aux input, Jensen output
transformer