Got my hands on a Valveboy. Its a pretty decent pedal with lots of similarity to a Marshall preamp. Four gainstages cascaded into a passive TMB tone stack and a "prescence" switch. The Second gain stage can be switched in and out for more/less distortion. This thing has pretty good build quality, with orange drop caps and ceramic tube sockets. Double sided PCB too.
BTW. This is a realt tube circuit. B+ is around the mid 250VDC range.
Heres a Epicenter Audio Valveboy Schematic. I didnt include the switching for the optocouplers. Thats easy enough to figure out. K-map is for witch optocoupler switches on at what setting.
too bad it's gone! lawl!
ReplyDeleteWoah! Still have mine👍
ReplyDelete