This is one of the largest tubes I have - so I put it on a special chain as well... (see next photo). It really has this industrial feel. I just posted it up last night on etsy for sale - half the pendant is really due to the weight of the chain.. its heavier than most but matches up with the grid inside this Vacuum Tube.
I scrounged up some new hardware shapes for the chain too.

This has to be one of my fav Vacuum Tubes - and the good news is that I acquired 3 that are very very similar. If someone is interested in buying something directly (not via etsy) you should drop me an email at zero.space @ gmail.com - because I can knock off a few dollars.

anyway, a bit about these tubes:
they are not useable anymore - these are not super old rare working tubes - in case anyone was worried. Basically, they are almost trash.
Whats inside a tube?
Is it dangerous?

well most of these tubes were from the 70's and later (80s)... I can't tell exactly whats in them but it appears most of the silvery coating is probably magnesium... which oxidizes quite quickly. there's a great article here on the "getter" - the silver material (no, not lead nor mercury!) - at this site: [link]