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Classic Currents

(1) Tested Balanced 1956 CBS 6SN7GTB Tube Short Bottle Black Plate CF 6SN7 GT

(1) Tested Balanced 1956 CBS 6SN7GTB Tube Short Bottle Black Plate CF 6SN7 GT

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(1) Tested Strong and Balanced CBS 6SN7GTB Tube.
Date Code CF (June of 1956).

Short bottle envelope with a balanced mutual conductance (Gm), side horseshoe getter and black angled T plates.

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

Gm Test = 3125-3125 micromhos
Minimum pass/good = 1650-1650

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

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