I would agree with George, the solid state Mac will work much better. A tube amp delivers more power at a higher impedance. The impedance curve of your speakers indicates your speakers will have a louder output basically from 700 to 7000 Hz. A solid state amp
delivers the power equally across
the frequency spectrum.
For a linear sound with a tube amp, you need a speaker with a smooth impedance curve without any bumps or dips.
http://fritzspeakers.com/Images/speakers/Carbon7SEimpedancePhaseGraph900.jpg
http://fritzspeakers.com/Images/speakers/Carbon7SEimpedancePhaseGraph900.jpg