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tube square wave generator

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analognow

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I'm running a tube with specs similar to a 12ax at lower voltage (15-30v), and I want to build a tube square wave generator, hopefully with only one tube. Any thoughts?

Thanks, Leon
 

Avoid cross posting! I already suggested a multivibrator circuit. In my opinion, a voltage gain of > +1 is needed to design
a relaxation oscillator or multivibrator. It can't work with only one tube (unless you utilize a transformer).
 

You can make with one tube - resonant circuit and then place saturation circuit.
Is not relaxation oscillator, but it works.
(keep in mind that resonant circuit plays the role of transformer in amplitude tranbsformation ratio)

Best regards.
 

The 12AX7 is actually 2 triodes in a single package, so it can be used as a multivibrator. Can't say whether it will work at such low voltages, but it likely will.
 

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