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(1) Tested Sylvania 6BK7B Tube with Box Code ch JHY 6BK7 B Twin Triode Tube

(1) Tested Sylvania 6BK7B Tube with Box Code ch JHY 6BK7 B Twin Triode Tube

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(1) Tested Sylvania 6BK7B Tube with Original Box.
Date Code ch JHY.

This tube tests above NOS.

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

Gm Test = 10,000-11,250 micromhos
Minimum pass/good = 5350-5350
Average NOS rating = 8025-8025

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