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I hope that the 21" round tube doesn't suffer the fate of the 15GP22 regarding rebuildability (I know the 21" doesn't have the vacuum leak problems of the 15"). Seems like there have been people trying to rebuild the 15GP22 but they have run into a lot of problems because they're having to retrofit/rebuild parts. Has there ever been a rebuilt 15GP22, or were the replacement tubes available in the RCA distributer's stock through the 70's just new old stock units built in the 50's and never used?
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