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Most of recent supply are ex-USSR military, but now in recent years a very serious enthusiast is making his own. https://www.youtube.com/watch?v=wxL4ElboiuA
Ah, the fun we used to have with high voltages before LEDs, like having to use magic eye indicators for simple level meters https://en.wikipedia.org/wiki/Magic_eye_tube
but now in recent years a very serious enthusiast is making his own. https://www.youtube.com/watch?v=wxL4ElboiuA
Thanks Clive, that is a wonderful video, it kept me very entertained over lunch! We should mention that he is doing this as a business...even so, this is "proper" electronics :D
This all takes me back to just after the iron curtain opened up around 1990, I was working in the music industry at the time, and the rumour (probably true) was that many Eastern European valve manufacturing companies were delighted that they'd now have the opportunity to move to modern semiconductor manufacturer...and what actually happened was that lots of Western audio companies visited them and said "please don't stop, we're desperate for valves because we can't get them in the West any more!!!"