Raytheon 12AT7 ECC81 3 Mica Black Plates Halo Getter Radio Tube
***** Tested on our new proprietary tester , the E3444 Triplett.
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 , Georgia. *****
*********************************************************************
Industry Bogey transconductance = 5500/5500µmhos
Industry Bogey plate current = 11.0/11.0mA
Results =
5225/4600µmhos ~ 11.4/9.8mA
Usa Shipping $6I have many other types of tubes ~ No Additional Shipping Charges
All tubes are Guaranteed
♪♪♫♫♫♫ Thank You ♫♫♫♫♪♪
126
GreenGirl's Guaranteed VintageTubes