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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I think i saw that crate 120w crate amp in my local guitar shop a few days ago. Not to sure what there like. I did hear this guy using one at this guitar show though and it sounded pretty good, but then i guess it was one of the crate amps u could get :)
