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(1) Tested GM 7C5 Tube Date Code 939 Loktal Tube Beam Power Loctal Tube

(1) Tested GM 7C5 Tube Date Code 939 Loktal Tube Beam Power Loctal Tube

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(1) Tested GM (General Motors) 7C5 Loktal Tube.
Date Code 939.
The 312 EIA code indicates that this tube was made by Sylvania for GM.

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

Gm Test = 3350 micromhos
Minimum pass/good = 1900

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