By virtue of their electrical properties, tubes generate a special waveform when they're saturated, which is why tube engineering has tremendous tonal advantages over solid state or DSP solutions, particularly for crunch and lead sounds. Tubes enter the saturation zone gradually or softly, which lends tube-driven tone its trademark yet totally unique character.
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I love anything to do with arpegios and sweep picking. Try typing "carcass" in on the search on guitartricks. There should be a piece with a sound file. It is a paul guilbert song with arpegios and would be good to learn. Sound file is bad quality though. Not sure which paul guilbert song it is either... so i'm going to ask some people on this forum :)