Tubes! http://www.oddmix.com/tech/circ_oscillator_neon_relaxation.html
Or you can find circuits that use tubes like the 6SN7. 100V no problem! JOnathan
They take over a hundred volts too. It's easy enough to get a sine wave like that with a Royer circuit with a high step-up ratio, but how do you get a triangular wave of over a hundred volts? - John
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