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(1) Tested Hytron 7R7 Tube Date Code 7-40 Twin Diode Pentode Loctal Tube

(1) Tested Hytron 7R7 Tube Date Code 7-40 Twin Diode Pentode Loctal Tube

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(1) Tested Hytron 7R7 Tube.
Date Code 7-40.

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

Gm Test = 3300 micromhos
Minimum pass/good = 1900
Each diode section tests at 1750-1000 where 800 is minimum pass/good.

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