Unusual CRTs: 5JP4 and others

[Adam]

I was at a place that sells used electronic junk today that I go to often, they have a big yard full of all kinds of stuff. There is a falling down shack in one corner with a bunch of old round CRTs in it. I had checked it out years ago, and all I found were mostly P1 and P7 tubes, and not a single white phosphor tube, there's about 20 to 30 of them and they range from 3-12". I wasn't really interested in any of those and hadn't looked back there since. Well part of the shack collapsed and revealed some more tubes, I found 1 P4 tube, this 5JP4 which appears to be an electrostatic tube with the connections for the deflecting plates on the side of the neck, instead of at the base. It has long ago gone to air, so I don't think it could be of any use, but I brought it home, just because I was curious if anyone had ever seen a set that used one of these.