(1) Tested Zenith 12W6GT Tube with Original Box.
Date Code 8-39.
The 312 EIA code indicates that this tube was made by Sylvania for Zenith.
This tube tests above NOS specs.
Tested on a calibrated Hickok TV-10 military tube tester and exhibiting no shorts or leaks with the following results:
Test Result = 10,625 micromhos
Minimum pass/good = 5650
NOS Target Value = 8475
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