Some hobbyists who are building their own tube synthesizers:
The most complete list of modular-synth form factors we know of. Covers both current production and defunct manufacturers.
Magnus Danielson's very good synthesizer hobbyist page.
One Electron--very good output transformers, plus one of the best libraries of classic
vacuum-tube circuit schematics on the web.
Electra-Print--the best tube-audio specialty transformers we know of
shit planet! Shit Planet!!! SHITPLANET!!!!!
This site has been online since November 1998.
Last update January 2017