Not sure yet if I want to sell these. We are going to set up a test for the NL-7171 tubes to see if they are good. I don't know anything about these tubes, some could be used, some might be new, some could be 50% or 95% used. Ignitrons will work good as new right up to the very end. Often the factory log book tells maintenance when to change the tubes before they give out so they don't loose product on the assembly line waiting for maintenance to repair the equipment. Even if a tube is 95% used up that is good as new to me I wont be using it as much like a factory would 40 hours a week for 3 shifts. I am building a rail gun the NL-7171 will be good for this project cap bank full charge is 270,000,000. watts. I don't want to be any closer than 100 feet when I push the button.