***** 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 = 1600/1600 µmhos  & 

Industry Bogey plate current = 2.3/2.3  mA

Results =1510/1460 µmhos  ~ 2.1/2.1 mA

            =1500/1480  µmhos ~ 1.9/1.9 mA

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