Weird CRT needed

[jr_tech]

Was the crt a "roundie" like in this console ?
Some of these consoles may have used a type of "Charactron" CRT, where the beam first is deflected to plate that is like a stencil for typically, 64 alpha-numeric characters. Then the beam (now with the shape of the desired character) is re-centered in the electron gun by another deflection system, and then it is deflected to the screen by yet another deflection system. These guns were very long, because of the complex deflection scheme and the character mask.

http://en.wikipedia.org/wiki/Charactron

P31 would be a Blue-Green phosphor.

jr

[jr_tech]

Originally Posted by jr_tech

P31 would be a Blue-Green phosphor.
jr

Ok, color me wrong on that one... wonder why my wife thinks that I am blue-green color blind.

P-31 on the left (Tek 211) ... Green P-1 on the right (Heathkit OL-1)

jr

toober ... could you post a pix of the remains of the CRT in question?

[jeyurkon]

Maybe not a TV, but interesting. The attached schematic shows the display section. This is from Console Hardware Manual

Except this appears to be a 12" version and not 21"

John