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, that was amazing. Apart from the second time he played when we also managed to get to the front row and this time he had his amps a lot louder and everytime he starting playing higher notes i thought my ears drums were going to explode.