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Classic Currents

(1) Tested 1961 RCA 6SN7GTB Tube Black Stagger Ladder Plates Date Code MG 6SN7GT

(1) Tested 1961 RCA 6SN7GTB Tube Black Stagger Ladder Plates Date Code MG 6SN7GT

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(1) Tested RCA 6SN7GTB Tube.
Date Code MG (May of 1961).

Bottom square D getter with black 4 hole staggered plates.
The tube number is worn off of the glass.

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

Gm Test = 2750-2875 micromhos
Minimum pass/good = 1650-1650

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

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