For your kind consideration is this vintage RCA 12AX7 preamp tube made in the USA. It has the long black plates, D getter, and the pins are in good condition. The ink faintly shows the "meatball" circle logo of the 1950s. 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 reads at 1150 & 1000 with 1250 being considered new.
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