Make your own Vacuum Tubes!
This is a special link to a 17 minute video of a Claude Paillard building his own vacuum tubes by hand in his shop. I’m totally speechless at the quality of his workmanship. Very impressive. Watch it, even if you know nothing about vacuum tubes, just to have an idea of what’s involved and to see him at work.
The page is in French, but that shouldn’t stop you as the video doesn’t contain any verbal explications.

by Robert
"The distance is very far. I would have no doubt that you could control it from 100ft -200ft or more. ..."