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(1) Tested Sylvania 6BK7B Tube and Box Code fh EAJ 6BK7 B Twin Triode Tube (b)

(1) Tested Sylvania 6BK7B Tube and Box Code fh EAJ 6BK7 B Twin Triode Tube (b)

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(1) Tested Sylvania 6BK7B Tube with Original Box.
Date Code fh EAJ.

This tube tests well above NOS.

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

Gm Test = 10,250-10,125 micromhos
Minimum pass/good = 5350-5350
Average NOS rating = 8025-8025

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