I think they are to protect you and the 304TL's.... Jesus.... My GP has some of them that they used in radar stations and world talk AM transmitters from WWII.....Bah, those tube covering thingies are too fancy.
I need to win the lotto //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif