(1) Tested Zenith 6AQ5 Tube.
Date Code 552.
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 = 3800 micromhos
Minimum pass/good = 2320
NOS Target Value = 3480
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