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(1) Tested Philco 12SN7GTA Tube Gray Plates Code 6230 Horseshoe Getter 12SN7 GTA

(1) Tested Philco 12SN7GTA Tube Gray Plates Code 6230 Horseshoe Getter 12SN7 GTA

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(1) Tested Philco 12SN7GTA Tube.
Date Code 6230.

Gray 4 hole ladder plates with a side Horseshoe getter.

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

Further tested under real operating conditions on a Class A amplifier and exhibiting no microphonics.

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