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 i think i'm underratted :). in my opinion jason becker is underrated. I never here people that i know talk about him. Also michael angelo.. i know a lot of u think he's isnt that good but i think that he does deserve more fame. Basically all the guitarist who never manage to become part of a famous band. Look at kirk hammet for example.. the most overratted guitarists ever just because he is in mettalica .