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Phil, I got Terry's name and the other information from the archive of Pete's Web site.
I took your Google link and ran with it, and got at least two part numbers for that socket: Photonis FE-1120 and Hamamatsu E678-20B. Photonis makes a photomultiplier tube, the XP2262B, that appears to use a base similar to the one on the 15GP22. That base is in fact the number you found, JEDEC B20-102. If that company will sell both the base and the socket, Neil could make the extension he needs (using HV wire on pin 13 and some kind of high-voltage silicon to seal it perhaps).
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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