***** 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 = 1600/1600  µmhos  

 

         Industry Bogey plate current =  1.2/1.2mA

                                            Results  = 1450/1510  µmhos ~ 1.02/1.11mA

                                                                          = 1445/1550  µmhos ~ 1.06/1.14mA