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(1) Tested Zenith 12BY7A Tube Date Code 026 Sharp Cutoff Pentode 12BY7 A Tube

(1) Tested Zenith 12BY7A Tube Date Code 026 Sharp Cutoff Pentode 12BY7 A Tube

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(1) Tested Zenith 12BY7A Tube.
Date Code 026.
The 312 EIA code indicates that this tube was made by Sylvania for Zenith.

Smoked glass envelope with black plates and an O ring halo getter.

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

Gm Test = 8000 micromhos
Minimum pass/good = 5700

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