[sdiy] Tube Circuits - App notes ?

[Michael Buchstaller]

Hello friends,

from semiconductor manufacturers i know that there are plenty of application
notes that show how to use e.g. Opamps for everything one could imagine.

But i am looking to find something similar for tubes. All schematics i see are audio
or RF amplifiers, guitar amps etc. But how do i make basic circuits (for a synth or
analog computer) like comparators, logic gates, oscillators, filters, etc. ?

Can anybody suggest a book or online resource ?



-Michael Buchstaller