RCA 12AT7 ECC81 Black Plates Vacuum Tube
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***** Tested on our proprietary tester , the E3444.
It's a Triplett 3444 that has been enhanced.
This tester uses regulated power sources for the bias, plate,
& screen voltages, as well as modified operating & testing procedures.
Filament voltage is also controlled.
Tubes are tested in accordance with the manufacturer's
specifications; measurements closely align with a laboratory tester built to
rigorously measure vacuum tube characteristics.
Tubes can be accurately matched for gm & plate current at
the manufacturer's specified test points or at other specified test points.
***** This tester was prepared by Mr. Paul Hart of Roswell,
GA *****
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Industry Bogey transconductance = 5500/5500 µmhos
Industry Bogey plate current = 11.0/11.0mA
Results = 4550/5175 µmhos ~ 7.2/10.2mA
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