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(1) Tested Tung Sol 6SF5 Tube Date Code NU3 6SF5 High Mu Triode Tube

(1) Tested Tung Sol 6SF5 Tube Date Code NU3 6SF5 High Mu Triode Tube

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(1) Tested Tung-Sol 6SF5 Tube.
Date Code NU3.

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

Gm Test = 1500 micromhos
Minimum pass/good = 940

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