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Classic Currents

(1) Tested 1947 Zenith 6SN7GTB Tube Date Code 713 Black Angled T Plates 6SN7 GT

(1) Tested 1947 Zenith 6SN7GTB Tube Date Code 713 Black Angled T Plates 6SN7 GT

Made by Sylvania for Zenith

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(1) Tested Zenith 6SN7GTB Tube.
Date Code 713 (March of 1947).
The 312 EIA code indicates that this tube was made by Sylvania for Zenith.

Chrome Dome style flashing with black angled T plates and clear mica spacers.

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

Gm Test = 2375-1875 micromhos
Minimum pass/good = 1650-1650

Also performance tested in-circuit through a Class A amplifier with no microphonics detected.

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