So I find that my m pulse is an incredibly dirty sounding amp which is fine but sometimes a cleaner sound is required and I just can't seem to get one. When I play at home its ok because the volume levels are alot lower but when it comes to gigging it just gets real dirty because I have to crank it a bit. when I play live I usually set the gain at 10 o clock and the master around 12 or 1. Am I just running out of headroom? I find the amp slightly underpowered for what I need, granted Im only running a single 8 ohm 1x15 but I wouldnt like to push the master much more for the fear of clipping (Damn the lack of clip indicaters!!) plus it would most likely dirty things up even more if I did. Would different pre amp tubes make a noticable difference to the dirty factor? Or is this machine simply a one trick horse just dirt and growl all the way?