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Classic Currents

(1) Tested Zenith 6SN7GT Tube Tall Bottle Code 139 Black Plates Sylvania 6SN7 GT

(1) Tested Zenith 6SN7GT Tube Tall Bottle Code 139 Black Plates Sylvania 6SN7 GT

Made by Sylvania for Zenith

$24.95 USD
$24.95 USD
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(1) Tested Balanced Zenith 6SN7GT Tube.
Date Code 139.
The 312 EIA code indicates that this tube was made by Sylvania for Zenith.

Balanced mutual conductance (Gm) with a tall bottle envelope, black staggered ladder plates and a bottom foil D getter.

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

Gm Test = 2500-2500 micromhos
Minimum pass/good = 1650-1650

Further tested under real operating conditions on a Class A amplifier and exhibiting no microphonics.

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