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(1) Tested DuMont 12SJ7 Tube Date Code 58-43 Sharp Pentode Vacuum Tube

(1) Tested DuMont 12SJ7 Tube Date Code 58-43 Sharp Pentode Vacuum Tube

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(1) Tested DuMont 12SJ7 Tube.
Date Code 58-43.

This tube tests well above NOS.

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

Gm Test = 1875 micromhos
Minimum pass/good = 1050
Average NOS = 1575

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