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Classic Currents

(1) Tested Balanced RCA 12SN7GTA Tube with Box Black Plates Code AN 12SN7 GTA

(1) Tested Balanced RCA 12SN7GTA Tube with Box Black Plates Code AN 12SN7 GTA

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(1) Tested Balanced RCA 12SN7GTA Tube with Original Box.
Date Code AN.

Balanced mutual conductance (Gm) with a bottom square D getter and black staggered ladder plates.
The tube number is worn off of the glass.

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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