Hey thanks for the info, yaaaaaaaaaaaalll. First thing to do is find out what, if any mods have already been done. I'm going to try to post some detailed pics of my amp. One thing is certain, she's a powerhouse. Last night, after a "few" drinks, I sat with my 6string bass (active and really hot) and one 1510 Marshall cab, and just sat there and blasted myself with massive chords. It was around 100 degrees in here, and the air blast pumping from the speakers was fanning me pretty good. Channel one gain on 8, bass and mid pegged, treble and presence on 3. I probably should've worn ear plugs..................