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(1) Tested Tung Sol 12BK5 Tube with Box Date Code ZY-F Beam Power Pentode Tube

(1) Tested Tung Sol 12BK5 Tube with Box Date Code ZY-F Beam Power Pentode Tube

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$8.95 USD
$8.95 USD
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(1) Tested Tung Sol 12BK5 Tube with Original Box.
Date Code ZY-5. 

This tube tests well above NOS ratings.

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

Gm Test = 7250 micromhos
Minimum pass/good = 3450
Average NOS rating = 5175

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