One of my FN2016 purchases was a Raytheon 2051 valve probably from end of 1950's. I bought it just because it looked nice, not for real use.
I should have bought a socket for it, so it would be easier to keep it standing out of a box.
I was thinking that maybe the filament will glow, but it doesn't. Not because it is broken since it draws the stated current, but probably because it is not meant to glow.
I will read a bit about thyratron so that I can explain it to whoever will see it.