Finished a new module

[Eric Barbour]

It's a quad VCO, made with only 5 tubes. Four 5696 thyratrons
and a 12AT7.

It's fat, baby.

Tech-heads will not be happy, no doubt some of them will claim that such
a primitive circuit can't possibly work and be stable. Sorry.....

An extra bonus: the ionized argon is visible from the sides of the
5696s due to their unusual construction, with an open anode consisting
of a narrow strip of metal with the control electrodes behind it.
It gives a nice purple haze which pulses visibly as the oscillator
pitch goes up and down.

-- 
Eric Barbour
Svetlana Electron Devices
Portola Valley CA USA