Classic Currents
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(1) Tested 1974 Western Electric 408A Tube.
Date Code 7439 which places the production of this tube to July - September of 1974.
Black plates with a top O ring halo getter.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 3500 micromhos
Minimum pass/good = 2480
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