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(1) Tested Very Strong Zenith 6DQ6B Tube Date Code 039 MCL 6DQ6 B Power Tube

(1) Tested Very Strong Zenith 6DQ6B Tube Date Code 039 MCL 6DQ6 B Power Tube

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(1) Tested Very Strong Zenith 6DQ6B Tube.
Date Code 039 MCL.
The 312 EIA code indicates that this tube was made by Sylvania for Zenith.

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

Gm Test = 8500 micromhos
Minimum pass/good = 3800

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