I've owned several bass combos and one 'head' and cab rig, although several cab senarios. my head is the SWR bass 350. I always thought that I really liked the head because of the tube pre. it seemed to have a more pleasing sound to me. after giving a friend a hard time about his going SS I finally tested SS with my own gear. I also own Tech21 RBI and two Aguilar GS-112 cabs. out of curiosity I hooked up my guitar to the RBI running into the power amp section of the SWR using the effects return, thus bypassing the tube in the SWR. Although I did NOT like the solo sound of the SS set up I have to admit that the SS sound combined with a band sound was much more useable. it seemed slightly more compressed, yet cutting through better than running through the tube, into the RBI and back to the power amp section. Has anyone else noticed things like this? Has anyone switched away from tubes? Why? Which SS Heads or power amps do you feel are most pleasant to listen to?