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(1) Tested Zenith 6KT8 Tube with Box Code 439 Sylvania EIA Triode Pentode Tube

(1) Tested Zenith 6KT8 Tube with Box Code 439 Sylvania EIA Triode Pentode Tube

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(1) Tested Zenith 6KT8 Tube with Original Box.
Date Code 439.
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 = 5000-1400 micromhos
Minimum pass/good = 3500-650

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