An old ham radio friend of mine who now lives in Illinois makes call sign plaques. He has just started making them with radio tubes in them. The tubes are not operational and he lites them with led light bulbs.
He is going to be interested in large tubes, I would guess at least 2" in diameter and a least a little taller, not including the pins.
The last picture from his web site is an example of how he uses the tube. The call sign is kf7jyo steve. He has an engraving machine that cuts glass, marble, ceramic, wood etc. I hope this can be helpful or at least interesting, Mike.
http://www.jimsengraving.com/main/page_ham_art.html
Bookmarks