Hey guys, I have a JSX Half stack and know virtually nothing about tubes. I've had the amp since xmas of 05. I dropped the head from about 3 feet last month >_< and I think it may have busted a tube. I hear glass clinking when I tip it. So what kind of tubes should I look for? I dont know what price range Im in because I dont know how much they cost. I dont really know how much they effect the sound, but I play mostly metal and shred kinda stuff. I like to be able to get a good heavy death metal tone, but also a good crunchy blues tone, and warm, jazzy cleans. (I know, the dream tones, eh?) Any suggestions? Also, would I be able to install them myself? Is it fairly easy?