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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Well maybe you havnt got a very good musical ear or your just saying what you have heard from other people because you just agree with the majority. I mean most guitarists songs sound very similar because they like to stick with a certain tone and style. Wouldnt it be retarded to try and make every song you made really different. From the songs you said you have heard i agree that those ones are probably fairly similar because they are mainly of one of his albums. 2x again is a very melodic song and has pretty much no shredding in it. Check it out.