Description

Siemens 12AT7 ECC81 Vacuum Tube <><><><><><><><><><><><><><><><><><><><><><><><><><><><><> ***** Tested on our proprietary tube tester, the E3444. It's a Triplett 3444that 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 ***** Mr. Hart maintains all of our testers exclusively. ********************************************************************* Industry Bogey transconductance = 5500/5500 µ mhos Industry Bogey plate current = 11.0/11.0mA Results = 4210/4420 µ mhos ~ 7.4/8.9mA USA Shipping $6 I have many other types of tubes ~ No Additional Shipping Charges All tubes are Guaranteed Thank you 3 ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirl's Guaranteed VintageTubes