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(1) Tested Balanced GE 12SN7GT Tube Gray Ladder Plates Date Code 4-39 12SN7 GT

(1) Tested Balanced GE 12SN7GT Tube Gray Ladder Plates Date Code 4-39 12SN7 GT

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(1) Tested Balanced GE 12SN7GT Tube.
Date Code 4-39.

Balanced mutual conductance (Gm) thin based tube with a side round getter and gray 4 hole ladder plates.

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

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

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