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Classic Currents

(1) Tested Balanced Westinghouse 6SN7GTB Tube Black Plates Code 7R04 6SN7GT

(1) Tested Balanced Westinghouse 6SN7GTB Tube Black Plates Code 7R04 6SN7GT

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(1) Tested Balanced Westinghouse 6SN7GTB Tube.
Date Code 7R04.

Balanced mutual conductance (Gm) with black staggered ladder plates and a top square angled getter.
The wording on the base is faded but still legible.

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

Gm Test = 2625-2625 micromhos
Minimum pass/good = 1650-1650

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

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