Haha yeah I sometimes don't understand the point of what these things can do. My bro's Marshall (early 80's) has no preamp it's clean but has 2 volume knobs (sounds like spinal tap don't it ). One volume for treble the other for bass. We've played some big shows, and he has never gone past about 2 1/2 to 3 on the volumes, and even at that level it is so loud the impact will physically move you, so you can imaging what happens to your eardrums . Damaging but it sounds so good!! The reason AC/DC use 50watters is so they can turn the volume right up and 'drive' the amp to get as much sound out of it as possible, then they can put that driven sound through anything (more heads, boxes, P.A whatever) My brother was going to do the same thing, use a JMP for the tube preamp sound, then throw that through his loud/clean head for fine tuning and volume, now that would sound hypnotic. Marshall's are great you can drop one off a building, leave it out in the rain, and it will still probably work when you turn the thing on .