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Classic Currents

(1) Tested Balanced 1963 RCA 6SN7GTB Tube Code NB Black Plates O Getter 6SN7GT

(1) Tested Balanced 1963 RCA 6SN7GTB Tube Code NB Black Plates O Getter 6SN7GT

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(1) Tested Balanced RCA 6SN7GTB Tube.
Date Code NB (February of 1963).

Balanced mutual conductance (Gm) with a thin base, black angled plates, top halo O ring getter and sawtooth mica spacers.

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

Gm Test = 3000-3000 micromhos
Minimum pass/good = 1650-1650

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

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