Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <BA1ELECTRONICS-at-aol-dot-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