Tube Power vs Solid State Power

All I can say is what I’ve experienced. I have 95 db sensitive open baffle speakers from Spatial. I’ve run about five amps from six watts a channel tube up to 700 watts a channel solid state mono blocks. Of everything I tried, 20 watts of transformerless tube has the best bass, best dimensionality, best imaging, best everything. More watts didn’t make for better sound, just more headroom I didn’t need.

Sshhh, you’ll wake the circular argument tautology ostriches. One of em might pull its head out, see its own shadow, get so startled it thinks its a hedgehog, go running for cover bang into a mono block pass out and wake up sputtering word salad. On second thought never mind, same difference.

I prefer solid state class A single ended, as in sugden. I leave the tubes to the ancillary sources, such as the phono preamp, and my tubed border patrol dac, tubed rectifier power supply to be more accurate. I think this is the way to go, as you get the best of both worlds and also more flexibility to change things out.

I am more in the camp of tube vs. solid state matters the most when it comes to the amp, not so much the sources or linestage.  While I prefer all-tube, I think that finding the right amp is the most important thing when matching electronics to one's chosen speaker.  If the speaker is reasonably efficient, and if one does not have an extremely large room and insist on playing at rock concert levels, I personally like tube amps.  In the somewhat extreme circumstance where more than 100 watts is really needed, I might consider solid state because I don't like high-powered tube amps.  For most applications, I think one can find a good pentode/tetrode pushpull or output transformerless tube amp, and with high efficiency, single-ended triode amps can be added to the list of candidates.

When it comes to the amount of power needed, I think more people err on the side of going for "more" when they should have been emphasizing "better."   

1. IMHO height-sensitive speakers or mid- sensitive speakers in small room are must.
Powerful amplifier with low sensitivity speakers is the wrong solution. Voice coil heating causes compression. More power you give  - more compression you get.
2. Height-sensitive speakers work best with low power simple schematic triode tube amplifiers SET or push-pull. This combination gives a real transparency, micro dynamics, musical details, tone naturalness, natural life like dynamics.

Triodes have much less distortion and amplification element vs any type of transistors.
Plus triodes have very low 3rd order harmonics vs transistors and pentodes.
To get low distortion in transistor amplifier a deep global feedback should be used. 
This feedback shifts distortions to higher orders. Out brain is super sensitive to height order of distortions. Sound become more harsh, macrodynamic is sufferings, instruments tone become flat and artificial.
Also transistors have thermal distortions that tubes don't have. This issue solution is class A.