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(1) Tested National Electronics 5686 Tube with Box Beam Power Vacuum Tube (b)

(1) Tested National Electronics 5686 Tube with Box Beam Power Vacuum Tube (b)

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$8.95 USD
$8.95 USD
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(1) Tested National Electronics 5686 Tube with Original Box.

Box shows scuffing marks and had old tape residue on one side panel - see photo 4.
The wording on the glass is partially worn but still legible.

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

Gm Test = 3100 micromhos
Minimum pass/good = 1950

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