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Classic Currents

(1) Tested 1967 Sylvania 6SN7GTB Tube Black Plates Halo Code bf AHG 6SN7GT

(1) Tested 1967 Sylvania 6SN7GTB Tube Black Plates Halo Code bf AHG 6SN7GT

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(1) Tested Sylvania 6SN7GTB Tube.
Date Code bf AHG (June of 1967).

Thin base with red lettering.
Black angled T plates with a top round halo getter.

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

Gm Test = 2250-2375 micromhos
Minimum pass/good = 1650-1650

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

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