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(1) Tested 1976 Western Electric 415A Tube with Box O Ring Halo Getter Code 7639

(1) Tested 1976 Western Electric 415A Tube with Box O Ring Halo Getter Code 7639

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(1) Tested 1976 Western Electric 415A Tube with Original Box.
Date Code 7639 places the production to 1976.

Similar to a 6AS6.
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 = 2375 micromhos
Minimum pass/good = 1540

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