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(1) Tested 1970 Western Electric 404A Tube Black Plates Square Halo Code 7039

(1) Tested 1970 Western Electric 404A Tube Black Plates Square Halo Code 7039

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(1) Tested 1970 Western Electric 404A Tube.
Date Code 7039 places the production to July - September of 1970.

Black plates with a top square D halo getter.

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

Gm Test = 7125 micromhos
Minimum pass/good = 4600

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