Unused Sylvania JHS 12AT7 WA ECC81 Vacuum Tube D-Getter Very Strong & Balanced 

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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 = 5960/6080  µmhos  ~  12.5/13.0mA

                                                                                  


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