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Classic Currents

(1) Tested National Union 12BF6 Tube with Box Date Code 5326 Double Diode Triode Tube

(1) Tested National Union 12BF6 Tube with Box Date Code 5326 Double Diode Triode Tube

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(1) Tested National Union 12BF6 Tube with Original Box.
Date Code 5326.
One panel of the box has scatterd spots of staining - see photos 5 and 6.

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

Gm Test = 1900 micromhos
Minimum pass/good = 1200
Each diode section tests at 1275-1125 where 800-800 is minimum pass/good.

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