Gregory's Server@jonhendry not that i am aware of. i vaguely recall someone made a tube with passive parts like resistors inside, but no other semiconductors.
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  @tubetime @jonhendry the Korg/Noritake Itron Nutube assemblies might combine the two: https://www.korgnutube.com/en - it's basically using a VFD as an audio amplifier |
@tubetime @jonhendry I think I have one with a diode inside, at least that's what it looks like, it might be something else entirely.