4 ms·

xray, photomultiplier and laser tubes are still SOTA. PM tubes in particular have a huge number of glass feed through for the intermediate plate voltages.

• SoftTalker 3mo ago
  Musical instrument amplifiers still use them as well, at least some of them.
  • namibj 3mo ago
    Those are Not where the tubes are SOTA.
    • eimrine 3mo ago
      It is impossible to achieve a proper guitar distortion without pentodes.