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The 621TS could not have been designed before the war. As David mentioned the first miniature tubes were the 1 volt variety for use in the "pocket" radios like the BP10. Many of the tubes used in the 621TS were not even available until after the war.
6J6 - 9/42
6AG5 - 9/42
6AL5 - 8/44
6BA6 - 10/45
6BE6 - 10/45
6AT6 - 10/46
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