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Classic Currents

(1) Tested Balanced RCA 6SN7GT Tube Smoked Glass Code 248 Black Plates 6SN7 GT

(1) Tested Balanced RCA 6SN7GT Tube Smoked Glass Code 248 Black Plates 6SN7 GT

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(1) Tested Balanced RCA 6SN7GT Tube.
Date Code 248.

Balanced mutual conductance (Gm) with a smoked glass envelope, staggered 4 hole black ladder plates and a bottom square D getter.

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

Gm Test = 2000-2000 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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