Hi, I'm certain there's a logical answer to this but it's something I can't quite understand. If you own a nice tube amp (I don't!) then I imagine you can get a great overdrive /distortion sound from it. Why do people that own these amps pair them with £100 overdrive or distortion pedals? Surely you'd get a much better sound just using the amp on its own than by driving it with a digital pedal?

Apologies for the newbie question!