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(1) Tested 1973 Western Electric 403B Tube Code 7326 Black Plates O Ring Getter

(1) Tested 1973 Western Electric 403B Tube Code 7326 Black Plates O Ring Getter

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(1) Tested 1973 Western Electric 403B Tube.
Date Code 7326 places the production to April - June of 1973.

Black plates with a top O ring getter.

Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:

Gm Test = 4125 micromhos
Minimum pass/good = 2750

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