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Classic Currents

(1) Tested GE 6SN7GTB Tube Gray Plates Horseshoe Getter Code 56-17 6SN7GT

(1) Tested GE 6SN7GTB Tube Gray Plates Horseshoe Getter Code 56-17 6SN7GT

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(1) Tested GE 6SN7GTB Tube.
Date Code 56-17.

Gray plates with a side horseshoe getter.

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

Gm Test = 3000-2875 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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