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The reason I asked is that I have limited shelf-space for our tubes, and was going to leave out the Loktals in our inventory, figuring they were not too useful to many restorers. I wasn't aware that there were classic televisions that used them, I thought they were mainly used in military radios and such. I believe they came about for ruggedized installations near the end of WWII (they "locked" in place with a snap ring that fit into the groove on the center locator). There were lots of them released to the surplus market and lend-lease projects after the end of the war, which makes the timing about right for the subject-line television. Maybe Philco got a deal on those tubes!
--Bob
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