Sonotone Telefunken <> 12at7 ~ Ecc81
***** 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 Georgia *****
*********************************************************************
Industry Bogey transconductance = 5500/5500 µmhos
Industry Bogey plate current = 11.0/11.0mA
Results =
4800/4500 µmhos ~ 8.4/8.4mA
USA Shipping $6
I have many other types of tubes ~ No Additional Shipping Charges
All tubes are Guaranteed
𝄞
#327
GreenGirl's Guaranteed VintageTubes