That's seriously interesting! Thanks for the link.
As a humorous aside, for my birthday one year, an electronics mentor gave me a chip glued to the anode cap on top of a tube. He made a little label for it that read "microprocessor controlled tube", just as a joke. It was meant to be ridiculous, like putting a supercharger on a horse-drawn carriage.
But as the years passed, and we've seen a resurgence of vacuum tubes in audio circuits, I've often thought of that. With digital sources driving tube amplifiers, we now really do have lots of examples of microprocessor controlled tubes. And this link shows even more advancements in this area.
gofar99 Messages: 1650 Registered: May 2010 Location: Southern Arizona
Illuminati (4th Degree)
How cool a micro 300B on a chip The thermal load would force it to be immersed in liquid nitrogen. I see no reason why micro tubes on a chip could not be made. There are a number of tubes that are quite small now, so with technological advances since the "peanut" tube's heyday I can envision one an order of magnitude smaller. Be great for very high frequency and switching applications. For audio maybe, maybe not so great. Still a very interesting topic.
I was reading an article about this and there are now some hollow carbon tube chips that are likely to replace silicon based chips in the near future. The tubes are 1.4 nanometers in diameter, or approximately 100,000 times thinner than a human hair. Sounds like it's about to happen!