For your kind consideration is this vintage RCA 12AT7 preamp tube made in the USA. It has the short black plates, halo getter, and the pins are in good condition. Enjoy!
Tested on our calibrated Hickok 533A and reads Good on the Good/Bad scale on both Normal and Life Test settings, one side reading better than the other. Passes tests for shorts and gas. Mutual Conductance read at 4200/3200 with 4000 being considered new.
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