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Classic Currents

(1) Tested 1959 Sylvania 12SN7GT Tube Black 2 Hole T Plates Foil Getter Code 939

(1) Tested 1959 Sylvania 12SN7GT Tube Black 2 Hole T Plates Foil Getter Code 939

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(1) Tested Sylvania 12SN7GT Tube.
Date Code 939 (39th week of 1959).

Black 2 Hole T plates with a bottom foil D getter.

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

Gm Test = 2750-2500 micromhos
Minimum pass/good = 1650-1650

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