Original poster: "by way of Terry Fritz <teslalist@qwest.net>" <BA1ELECTRONICS@aol.com> HI ALL, I HAVE WHAT LOOKS TO BE AN IGNITRON TUBE-- IT HAS MERCURY IN IT. I WOULD LIKE SOME SPECS ON IT IF ANY OF YOU MIGHT HAVE SOME INFO. NATIONAL TUBE NL-7171 NATIONAL ELECTRONICS GENEVA, ILL THANKS, BART AVERY