Not really a television so I didn't know where to ask.
So I had someone ship me a strange relic from AT&T's experimental days in the 80's. It's a telephone. It's a speakerphone. It's a phonebook. It's a terminal. It's AT&T's Personal Terminal 510A.
It's a STRAAAANGE thing. It's the first time I've ever seen a gel membrane used for a touchscreen, giving the CRT a really, really alien feel when you poke it.
Unfortunately while it was extremely well packed, the tube broke at the base.
It identifies as a Zenith made 9ATK10. Manufactured September 16 1985. I can find absolutely no information about the tube. Because it's a fairly basic 9" monochrome tube there's hope that I can substitute in for other tubes I almost daily handle in machines like the classic compact macs. You guys are the only people who I think might be able to find the missing link.