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(1) Tested GM Delco 7A7 Tube Date Code 939 GM 7A7 Tube Loctal Loktal Tube

(1) Tested GM Delco 7A7 Tube Date Code 939 GM 7A7 Tube Loctal Loktal Tube

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(1) Tested GM (General Motors) 7A7 Tube.
Date Code A7.
The 312 EIA code indicates that this tube was made by Sylvania for GM.

The wording is partially worn but still very recognizable as being GM branded.

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

Gm Test = 1475 micromhos
Minimum pass/good = 1100

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