Has anybody here played around with vacuum tube electronics before? I got a couple old mono amplifiers which use tubes for both the power supply and preamp/power amp stages. I got my old David Bogen K130 fixed up (it was pretty bad, shattered tubes and rusted, looks like it got left in some kind of mud or clay) and now it works pretty good as a phono stage or a clean no-frills guitar amp.
Currently I'm trying to figure out with an amplifier chassis from a Hammond organ. It's actually two very different independent mono amps (not a stereo, Hammond used a separate amp for the reverb effect) and I'm thinking about how to rework it into a separate bass/midrange + treble amp and maybe throw in some effects, including the spring reverb tank. Maybe repurpose the percussion tube as a vibrato.
I always liked messing with old voltage-amplifying analog electronics on the side, it really stretches an imagination that's used to computers and code and virtualization. I also have some old magic eye tubes lying around, so I was thinking of filling one of the octal socket holes on the front of the chassis with a phosphor tube to show audio levels.