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(1) Tested Dumont 12V6GT Tube Date Code 66-22 Sylvania EIA Code Beam Power Tube

(1) Tested Dumont 12V6GT Tube Date Code 66-22 Sylvania EIA Code Beam Power Tube

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(1) Tested Dumont 12V6GT Tube.
Date Code 66-22.
The 312 EIA code indicates that this tube was made by Sylvania for Dumont.

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

Gm Test = 4050 micromhos
Minimum pass/good = 2320

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