15GP22: NIB Cinch ConnectorOstensibly used for photomultipliers too, hard-to-find 20-pin sockets for the 15GP22 tricolor cathode ray tube surfaced through the dedicated efforts of Terry Wise in early 2008. This TRW-Cinch Connectors item comes complete with a set of 20 pins and the round back cover. Cinch Model/Type 20-PM.
Sure enough, it's a match!
(page created 3-24-2008)