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(1) Tested 1972 Western Electric 408A Tube Black Plates O Halo Getter Code 7226

(1) Tested 1972 Western Electric 408A Tube Black Plates O Halo Getter Code 7226

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(1) Tested 1972 Western Electric 408A Tube.

Date Code 7226 which places the production of this tube to April - June of 1972.

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 = 4250 micromhos
Minimum pass/good = 2480

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