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Tested Balanced Strong Raytheon 6SN7GTB Tube Black Plates Code C14 6SN7GT (b)

Tested Balanced Strong Raytheon 6SN7GTB Tube Black Plates Code C14 6SN7GT (b)

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(1) Tested Strong and Balanced Raytheon 6SN7GTB Tube.
Date Code C14.

Balanced mutual conductance (Gm) and strong short bottle envelope with a side horseshoe getter, black 4 hole ladder plates 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 = 3250-3250 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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