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(1) Tested Strong Zenith 13Z10/13J10 Tube with Box Date Code 77-38 13Z10 13J10

(1) Tested Strong Zenith 13Z10/13J10 Tube with Box Date Code 77-38 13Z10 13J10

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(1) Tested Strong Zenith 13Z10/13J10 Tube with Original Box.
Date Code 77-38.

Tested on a calibrated Knight KG-600B tube tester with no shorts and no leaks where 50 is minimum pass/good with the following results:

Zenith = 100-100

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