Brown Base Marathon MX-226 #26 Globe Balloon Vacuum Tube ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? **** Tested on our proprietary tester , the E3444. Its 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 manufacturers 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 manufacturers specified test points or at other specified test points. ***** This tester was prepared by Mr. Paul Hart of Roswell, GA ********************************************************************* Industry Bogey transconductance = 1150 µmhos Industry Bogey plate current = 6.2mA Results =840µmhos ~ 3.9mA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Shipping $6 USAI have many other types of tubes ~ No Additional Shipping Charges ~ Just search my store All tubes are Guaranteed ?????? Thank You! ?????? ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubes505