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Classic Currents

(1) Tested 1957 Tung-Sol 12SF5GT Tube with Box Code 739 Tung Sol 12SF5 GT Triode

(1) Tested 1957 Tung-Sol 12SF5GT Tube with Box Code 739 Tung Sol 12SF5 GT Triode

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(1) Tested Tung-Sol 12SF5GT Tube with Original Box.
Date Code 739 (39th week of 1957).

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

Gm Test = 1750 micromhos
Minimum pass/good = 950

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