Man what an idiot I am. I was replacing the tubes in my Lonestar and mistankenly put the 5U4 in a 6L6 socket. I had sound until the thing started smoking. OMG! I unplugged it but it kept on smoking. It is obvious that I caused major damage. I pulled the tubes and put them in the correct spots. Amp works but what would I have burned up? I would really like to fix it myself. If I knew where to start. lol Any help would be appreciated.