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(1) Tested Sylvania 12BR7 Tube with Box Date Code bf JEK Twin Diode Triode Tube

(1) Tested Sylvania 12BR7 Tube with Box Date Code bf JEK Twin Diode Triode Tube

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(1) Tested Sylvania 12BR7 Tube with Original Box.
Date Code bf JEK.

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

Gm Test = 3625 micromhos
Minimum pass/good = 2500
Both diode sections test strong.

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