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(1) Tested Very Strong Sylvania 3LF4 Tube Date Code J1E Loctal Tube Loktal Tube

(1) Tested Very Strong Sylvania 3LF4 Tube Date Code J1E Loctal Tube Loktal Tube

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(1) Tested Very Strong Sylvania 3LF4 Tube.
Date Code J1E (etched on the top).

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

Gm Test = 2550 micromhos
Minimum pass/good = 1200

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