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(1) Tested Sylvania 6AS8 Tube with Box Code fe ESP Diode Sharp Cutoff Pentode

(1) Tested Sylvania 6AS8 Tube with Box Code fe ESP Diode Sharp Cutoff Pentode

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(1) Tested Sylvania 6AS8 Tube with Original Box.
Date Code fe ESP.

The box has moderate to heavy scuffing overall - see photos.
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 = 5000 micromhos
Minimum pass/good = 3530
The diode section tests at 1125 where 800 is minimum pass/good.

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