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Classic Currents

(1) Tested 1958 Philco 6SN7GTB Tube Black Angle Plates Date Code 58-04 6SN7GT

(1) Tested 1958 Philco 6SN7GTB Tube Black Angle Plates Date Code 58-04 6SN7GT

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(1) Tested Philco 6SN7GTB Tube.
Date Code 58-04 (January of 1958).
The 312 EIA code indicates that this tube were made by Sylvania for Philco.

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 = 2000-2125 micromhos
Minimum pass/good = 1650-1650

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

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