Thyratron experiment

A project log for Vacuum tube game in 21st century

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kodera2tkodera2t 06/26/2019 at 05:350 Comments

I am pure "communication system engineering" person and I have no experience thyristor, a high power semiconductor electronics device. Now we can find "thyratron" by very low price at shop because mostly vacuum tube price is supported by audio maniacs. I found 2D21 by 100JPY at vacuum tube store and this time I will try to examine how it works..

Basically thyratron is a switching device which current flow is controlled by grid voltage, as the same as thyristor by gate voltage. It's a kind of nonlinear device and no audio maniacs will need this one.

I found a good example circuit of sawtooth oscillator by 2D21, and quickly made as above. I don't have high voltage (250V, 0.1 uF) tolerance capacitor so I naively tried at anode voltage of 80V.

YES, it is working. resistor and capacitor defines time constant for the oscillation, and we can get sawtooth waveform as above!