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(1) Tested 1960 Gibson by RCA 6SN7GTB Tube Black Plates Code 60-22 RCA 6SN7GT

(1) Tested 1960 Gibson by RCA 6SN7GTB Tube Black Plates Code 60-22 RCA 6SN7GT

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(1) Tested Gibson by RCA 6SN7GTB Tube.
Date Code 60-22 (May of 1960).

Bottom 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 = 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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