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Classic Currents

(1) Tested 1957 Magnavox 6SN7GTB Tube Black Plates RCA EIA Code 57-09 6SN7GT

(1) Tested 1957 Magnavox 6SN7GTB Tube Black Plates RCA EIA Code 57-09 6SN7GT

Made by RCA for Magnavox

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(1) Tested Magnavox 6SN7GTB Tube.
Date Code 57-09 (February of 1957).
The 274 EIA code indicates that this was made by RCA for Magnavox.

Square D side 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 = 2625-2750 micromhos
Minimum pass/good = 1650-1650

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

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