4  Daystrom Mullard 12AX7 ECC83  Vacuum Tubes "I61"    

***** 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 Roswell, GA  *****

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Industry Bogey transconductance = 1600/1600  µmhos  & 

Industry Bogey plate current =  1.2/1.2  mA

Results = 1320/1395 µmhos  ~  1.01/1.05 mA

             =1355/1345 µmhos ~ 1.06/1.05 mA

             =1445/1495 µmhos  ~ 1.10 / 1.17 mA

             =1400 / 1495 µmhos  ~  1.04/1.09 mA 

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