Vintage Sylvania 12BH7A Vacuum Tube
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***** Tested on our proprietary tester , the E3444 Triplett/Westmore 501 :
It's a Triplett 3444 / Westmore 501 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 Falls Church , Virginia. *****
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Industry Bogey transconductance = 3100/3100 µmhos &
Industry Bogey plate current = 11.5/11.5 mA
Results = 2600/2575 µmhos ~ 7.7/8.2 mA
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