@Mike,?
nice retirement job, much appreciated by many.?
I did a similar thing, a charged inductor that spikes into a capacitor, to make a big "ping" at the LC frequency, it was driving an ultrasonic ceramic transducer.? Even got a patent for it and earned ?1.?
OK it was a primary-side FET and an on-time, not a spark-gap, but a similar "impulse drive" into a parallel tank circuit, a triangle envelope with a good crisp leading edge - perfect for echoes.?
Doesn't seem to be much interest in GM tubes, of cheap versions thereof.? My idea for a quantum-powered lottery number predictor, that everyone can afford, looks like it'll have to wait...?
Bonkers