Anyone know what tube is used in
Vintage Tele Check Television Vacuum Tube Tester
This is in shopgoodwill.com site
Just search the above phrase

That particular one I think uses the 8XP4, large neck rectangular tube. It'll sub most of the rectangular tubes of the 50's and has a maximum Anode voltage of 22k.
It can be removed from that box and installed directly into the chassis being worked on.

This morning up to $42..
To much for me.as a spare.