calling all tube heads! I'm currently running a Mesa Boogie Buster Bass all tube head (200 watts) into a 2x10 cab, and I'm finding that even with my moderately loud blues band, I don't have enough usable volume. When I play any accents or solo features, the amp clips into undesirable distortion. My question is; could the distortion be caused by the power tubes I'm using? I currently have Mesa STR 430 6L6 power tubes installed. I've heard that these tubes have a relatively low breakup threshold. Would another power tube allow me to get more clean volume from this amp?