Hello all, i'm new too the board and to tube amps, I have a question. When running a fullbore metal distortion pedal through my 5 50 express clean channel w/ all pre amp dials at 12 o'clock sounds great at volumes under 9 o'clock but anything higher and its just a wave of noise. The question is, is it just pushing the pre amp way to hard at loud volumes ? I have tried a couple distortion pedals with similar results.