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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They were different, they had good riffs and they wrote good songs. They have changed now and have become boring and the sound they are getting when performing live doesnt seem to be very good and they write crap songs.
