I received an email about this today. From 1958, a neon-filled Geiger Mueller tube by Amperex type 200N. (I am not affiliated with Electronic Goldmine in any way.)
For Geiger-Muller tube enthusiasts: https://theelectronicgoldmine.com/products/g27942?mc_cid=c31423c98d Price $149.95 Description: - Large mica end window neon-filled Geiger Mueller tube by Amperex type 200N is made for the detection of Alpha particles, however it also detects Beta and Gamm rays. The 200N has a 1.31" dia. Mica end window and an overall size of 4" long x 0.12" dia. near window (-) end and 0.255" dia. at the (+) positive tip. - The specs are as follows: - - Plateau is in excess of 200V - - Slope plateau 5% to 10% per 100V - - Dead time approx. 200 microseconds - - 50 counts per minute max background (shielded 2" lead). - The 200N operates from 700 to 900VDC. All of the specs are from the 1958 Amperex Electron Tubes & Semiconductor catalog. The Amperex 200N tubes that we have are New Old Stock and we test each one for operation before shipping. Limited Quantity. YouTube video: https://www.youtube.com/watch?v=rS3TpvsZabE I found this listed in Amperex_Electron_Tubes_and_Semiconductors_1958 catalog on pp22, 23: https://archive.org/details/Amperex_Electron_Tubes_and_Semiconductors_1958 Cheers, Jon D. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/b0cc0049-3210-42cd-9919-7b2c58542af9n%40googlegroups.com.
