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(1) Tested 1977 Western Electric 408A Tube & Box Black Plates O Halo Code 7713

(1) Tested 1977 Western Electric 408A Tube & Box Black Plates O Halo Code 7713

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(1) Tested 1977 Western Electric 408A Tube with Original Box.

Date Code 7713 which places the production of this tube to January - March of 1977.
The date code on the tube matches the date on the box so you know that it's the same box that it left the factory with.

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 = 3500 micromhos
Minimum pass/good = 2480

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