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 have a megadeth tab book for rust in peace. It is technical and is a lot harder than metallica stuff. My friend plays loads of metallica and it is simple compared to megadeth stuff. My friends mum has a friend who has the bass player of megadeth as his cousin :)