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(1) Tested Strong RCA 6BY6 Tube with Box Date Code BK Heptode Vacuum Tube

(1) Tested Strong RCA 6BY6 Tube with Box Date Code BK Heptode Vacuum Tube

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(1) Tested Strong RCA 6BY6 Tube with Original Box.
Date Code BK.

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

Gm Test = 1325-700 micromhos
Minimum pass/good = 750-315

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