I opened the box for the 1st time to test it.Rca VT-145 5Z3 Vacuum Tube ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Tested on a Hickok 6000A Min = 800/800Results = 2575/2425 ***********************************************************************Usa Shipping $6 I have many other types of tubes No Additional Shipping Charges All tubes are Guaranteed ๐๐๐๐๐๐๐&nb...sp;๐๐๐๐๐๐๐ ๐๐๐๐๐๐๐ ๐๐๐๐๐๐๐ ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirl's Guaranteed VintageTubesPCAB