Interesting conversations. The original conversations changed from the definition of power to sound quality of tube vs. solid state amps. There is an amazing bias here between the tube lovers and solid state lovers and music lovers. Personally, if the music doesn't sound real, then I couldn't care less if it is solid state or tube. Same logic applies if the sound drives me out of the room. As I mentioned previously, quality designed tube or solid state amps would reproduce the signal accurately and both sound wonderful. Speakers have various impedances and some are easlier to drive than others and that really affects whether the amps would work well or not. There are many various criteria for amp design. Imput impedance, gain, output impedance, current capacity, voltage, power output into specific loads, etc. All of these criteria can help determine if the design and construction and parts used should be of higher quality or not. Some times, more than not, you really do get what you pay for. All that said, I have listened to some wonderful tube equipment and also have listened to some equally wonderful solid state equipment. Nothing is perfect yet. it would be hard to design and build perfect. First, you have to assume that the music was recorded 100% correctly, using equally great recording equipment and that just simply is not the case. Maybe with Mark Levinson or Manley recording gear, but in most cases, the music isn't recorded perfectly from the beginning. Then send the signal from a source (album or cd or tape) to your preamp. Well, the cables have impedance don't forget and will slightly degrade the signal, unless corrected for. the pre-amp will degrade the signal. not one is perfect. The cables from the pre-amp to the amp degrade the signal. The amp will degrade and the speakers aren't perfect in reproducing signals either. See where I'm going? At this point in our scientific history, we aren't there yet. Electricity over wires and through tubes, resistors, inductors, capacitors, transformers, etc. will produce distortions and have losses. Can't get around it. Can a tube amp beat a solid state amp? absolutely, same can be said visa versa. How were they designed and built? Were they designed and built on the same price point? power output?, etc. if not, you are comparing apples to oranges.
I love good, accurately reproduced music and couln'd care less if it came from tubes or solid state. If it is right, then it is right.
enjoy