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(1) Tested 1953 Western Electric 6028 408A Tube Black Plates 6028 Tube Code 326

(1) Tested 1953 Western Electric 6028 408A Tube Black Plates 6028 Tube Code 326

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(1) Tested 1953 Western Electric 6028 408A Tube.

Date Code 326 which places the production of this tube to April - June of 1953.

Black plates with a top square D getter.

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

Gm Test = 3750 micromhos
Minimum pass/good = 2480

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