Tung Sol 12AY7 Vacuum Tubes    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  = 1750|1750 µmhos   

           Industry Bogey plate current =  3.0|3.0mA

                                               Results =1500|1450µmhos  ~ 2.44|2.26mA

                                                          

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