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Classic Currents

(1) Tested Balanced GE 12SN7GTA Tube Glow Top Filament Date Code RF 12SN7 GTA

(1) Tested Balanced GE 12SN7GTA Tube Glow Top Filament Date Code RF 12SN7 GTA

Glow Top Filament

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(1) Tested Strong and Balanced GE 12SN7GTA Tube.
Date Code RF.

Balanced mutual conductance (Gm) with a glow top filament, gray 4 hole ladder plates and a side O ring getter.

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

Gm Test = 3000-3000 micromhos
Minimum pass/good = 1650-1650

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