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Classic Currents

(1) Tested Westinghouse 6SN7GTB Tube Black Plates Code 8R17 6SN7GT Tube

(1) Tested Westinghouse 6SN7GTB Tube Black Plates Code 8R17 6SN7GT Tube

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(1) Tested Westinghouse 6SN7GTB Tube.
Date Code 8R17.

Top square getter with staggered 4 hole black ladder plates.

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

Gm Test = 2500-2375 micromhos
Minimum pass/good = 1650-1650

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

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