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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Yeah, i know what you mean. Its good to vary what you play and listen to sometimes. I saw a blues rock band a week ago and they were really great. When i was listning i was thinking " i wish i could play blues rock like that". I'm not really into just normal blues though !