If you want a gas discharge tube and not vacuum, you can even drop the coil on the inside: https://hackaday.io/project/194683-plasma-toroid-sky-guided-...
replyBut most hollow-state devices run on either DC or pulses, so coupled inductors wouldn't work.
Wouldn't work ... without additional electronic components.
replyThan you can skip the hollow state part altogether. And any plastic-package parts would screw your vacuum up badly - if it survives sealing and bakeout that is.
replyThat depends. Often vacuum tubes are used with DC (that is a rectifier) in some form though, in which case you can't do this since induction depends on AC. I'm not sure what purpose the article had for a triode though, depending on their application this might work.
replyInteresting idea! Wouldn’t have to be particularly high voltage either.
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