Tell me if i got it wrong..

One more thing.

Tube based units generally produce more even order harmonic distortion while SS designs produce more odd order harmonic distortion. Odd order distortion is more easily heard by the ear wheras even order Harmonic distortion may actually be pleasing to the ear.

my .02 cent worth.

This tube vs. solid state sound thing is one of the great misunderstandings in high end audio. The tube "magic" doesn't exist. There are no significant sonic differences between well designed amp circuits using either technology. I place a particular emphasis on the phrase well designed, by which I mean a circuit design that attempts to accurately reproduce an input signal. I'm not denying that it is possible to design a non-accurate tube product that sounds quite musical. Nor am I denying that such euphonic products have a rightful place in the high end audio world. However, if the goal is to faithfully amplify the input signal, then there is a convergence in sound quality between tube and solid state products.

As evidence of my statements I point to those manufacturers who produce both tube and solid state products. I strongly suggest you give a listen to Audio Research, Conrad Johnson, Lamm or EAR products of both type. It would be particularly interesting to find out whether these manufacturers specifically voice their products to play towards the audiophile preconception that tubes should sound different than solid state. I suspect many audiophiles crave the euphonic sound and manufacturers are only too willing to oblige.

Chuck, this mostly have nothing to do with tubes or SS rather than in type of amplifier's operation (Class B amps as an example or push-pull, eliminates even harmonic distortion components).

Harmonic distortions aren't realy important if the're lower than 0.4%

The MOST important thing for the music reproduction is an ansable of your components with speakers. Carefull analysis and/or listening to every component is the way to acheive the most desirable music reproduction you aim.

Bringing up tubes to drive your speakers will be just only 2 cents

Hope you follow...?

Sorry, Mara..., try that again, please. And what is "ansable"?

Good post, onhwy. Totally agree. Tube amp output impedence/speaker load interactions that change frequency response are the greatest factor in ascribing tube amp tonal effects, no? Some of these can be grotesque, too, as when I tried a VAC Avatar on my Parsifal Encores. What a way to destroy a fine speaker! OTOH some systems need that soft-top, vivid-mid, bass-bump that can sometimes be acvieved benignly and therefore euphonically.
I prefer the transducers neat, however.

So is Class A SS (like Pass amps)the best of both worlds?

Also keep in mind that the ultimate tweak in tube amps is...CHANGING THE TUBES! It has been my experience that N.O.S. tubes will dramatically change the sound for the better over stock Russian tubes. Of course, multiple N.O.S. power tubes are pretty much cost prohibitive these days, but I have achieved these results with small signal tubes. And you don't need to go bonkers with pricy Mullards either!