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Unless somebody knows what PAR means, we could guess - here's mine:
Production Acceptance Run (?)
Interesting guess. Phil: is there a date code on the 15GP22? The earliest known by me is the fourth week of 1954. If this tube is earlier it could be quite a significant 15G.
Pete
Last edited by Pete Deksnis; 01-10-2012 at 09:53 AM.