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Classic Currents

(1) Tested Silvertone 6SN7GTB Tube Black Plates D Getter RCA EIA 274 6SN7 GTB

(1) Tested Silvertone 6SN7GTB Tube Black Plates D Getter RCA EIA 274 6SN7 GTB

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(1) Tested Silvertone 6SN7GTB Tube.
The 274 EIA code indicates that this tube was made by RCA for Silvertone.

Black 4 hole ladder plates with a bottom square D getter.

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

Gm Test = 2450-2750 micromhos
Minimum pass/good = 1650-1650

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

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