Describe ube sound vs solid state

^I'm not familiar with the Mac 30. If that were the case, why would it have multiple impedance taps?
http://www.roger-russell.com/amplif1.htm#mc30

^^ If the impedance of the speaker is too low the output power of the amplifier will be lower and distortion higher. The lower impedance taps are provided to deal with this.

It might interested you to know that the voltage rules that we are talking about (http://www.atma-sphere.com/Resources/Paradigms_in_Amplifier_Design.php) were initially laid out by Electro Voice and MacIntosh back in the days when tubes were king (late 1950s).

^Them it would appear that the Mac 30 is not capable of adapting to the variable impedance swings of typical loudspeakers without deviating from linear frequency response?

Jump on ube now!!!!!

They both sound very close to real music, if done properly.