Hi, My dad is currently building me an amp, due to expense we are using an old solid state HH power amp. For the front end we have been experimenting with a Bassman 135 circuit. After a lot of fiddling around we have built a working bassman channel, thats sounds quite nice, but very clean, we can get nothing more than a little bit of grit. Is this because of the lack of output valves?? We tried building a distortion circuit onto the back of the bassman, unfortunately this only produces quite a harsh, fx pedal, type distortion, not the warm gravely tone i would like. Ideally i would like a clean bright sound like Flea's on By the Way (RHCP). I assume this is mainly down to the bass and strings. (unfortunatly i only have a Squier P-bass, but the strings can be replaced). Am i right, or is there more to it? As for the dirty, i really like the sound on Origin of Symetry(muse). I dont no how this is achieved, i no the he uses marshall, but not much more. Any help as to how these sounds are achieved would be very much appreciated!!