[SoftTalker]

Vacuum tubes are still made today, so I'm sure the knowledge is not lost. I'm curious about the answer as well.

[NoMoreNicksLeft]

I was under the impression that they were only made in eastern Europe at this point, former bloc nations. Even then, the demand must be microscopic at this point.

[drum55]

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]

Musical instrument amplifiers still use them as well, at least some of them.