Thank you all for your input, George, Ralph, and everyone else. I've always enjoyed the sound of tube amps, but have found the bass a little "lacking, tubby, soft". But for this shortcoming, tube amps have a sound that I really enjoy. All of these posts have been very informative. I will continue to research and look at the reviews of the suggestions that people have made. I understand that it all comes down to matching an amp with the speakers. I just wanted to get a general idea of what tube amps would deliver acceptable bass. Thanks again for all the input from everyone.