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(1) Tested Sylvania 6AB4 Tube with Box Code de JFJ High Mu Triode Tube

(1) Tested Sylvania 6AB4 Tube with Box Code de JFJ High Mu Triode Tube

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(1) Tested Sylvania 6AB4 Tube with Original Box.
Date Code de JFJ.

Some staining on the front tab of the box.

This tube tests as NOS.

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

Gm Test = 4125 micromhos
Minimum pass/good = 2500
NOS Rating = 3750

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