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(1) Tested GE 12SF7 Tube Date Code 626 General Electric 12SF7 Cutoff Pentode

(1) Tested GE 12SF7 Tube Date Code 626 General Electric 12SF7 Cutoff Pentode

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(1) Tested GE 12SF7 Tube.
Date Code 626.

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

Gm Test = 2250 micromhos
Minimum pass/good = 1260
The diode section tests strong.

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