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(1) Tested RCA 6SN7GTB Tube Date Code 513 Black Staggered Plates 6SN7GT

(1) Tested RCA 6SN7GTB Tube Date Code 513 Black Staggered Plates 6SN7GT

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(1) Tested RCA 6SN7GTB Tube.
Date Code 513.

Bottom square D 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 = 2375-2500 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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