Group, I have several (4 supposedly) 5AQP1 CRT's NOS. I have the Dumont spec sheets but have no idea what equipment they were used in. If anyone has any need for one or more, let me know. FYI, this is a 5" (obvious) diameter flat faced green phosphor medium frequency CRT. Eb 4 KV. Robert Downs - Houston wa5cab dot com (Web Store) MVPA 9480