I bought a Rivera Rockcrusher a couple years ago for a Carvin 100W half stack. Pricey but works great. Has a couple switches for "EQ" but I just use the amp settings. Used it with a 18W VHT (had to make a couple patch cords to get it inline with this one). Am currently using it with a Marshall JCM800 20W I just bought which has excellet tone btw. There's probably less expensive units out there that may work just as well, but this is a good one. Good luck... Dale