If I'm looking for "Tube Sound", why would I put a Tube Pre in front of a SS amp?


I'm purposefully not specifying speakers as I would like to know in general terms the arguments for and against. So, to the degree that speaker characteristics could also influence the choice, please  explain.  FWIW, I do not know a phase angle from an impedance curve so I will try and educate myself as we go along.  Hopefully, others may benefit too.
finsup
Atmasphere I have ARC tube pre-amp and Bel Canto ref1000m amps in my main system and newer BelCanto c5i digital Class D integrated amp in my second. They each sound quite different. The c5i in particular is smooth as silk with no edge or irritation whatsoever even when used with my Dynaudio monitors which can have a bit of a natural edge to them. The only fault I can find with it is the 60 watts do well but only go so far. It’s a fabulous device in a small reasonably affordable package overall.  Also has phono and serves well as a headphone amp with similar qualities. 
Inna 9-28-2016
Atmashere, Nelson Pass and John Curl are not the best SS designers in the world. You forgot Rasmussen of Gryphon and also some other European designers. Besides, Vladimir Shushurin of Lamm makes hybrid power amps that are in essense SS.
You keep making incorrect statements from time to time.
Inna, note that he didn’t say "the best SS designers in the world." He said "two OF THE BEST solid state designers in the world" [emphasis added]. IMO that categorization is indisputable, and is not negated by the fact that many of their designs were intentionally implemented to a lower price point than most or all of the products of the other manufacturers you mentioned.

Regards,
-- Al
@atmasphere 

Hi Ralph. To your point " What tubes do better than transistors is not make higher ordered harmonic distortions to which the ear is very sensitive and also perceives as irritating. That's not a matter of opinion its a simple fact and not a matter of debate."

I recall reading a number of articles on the Internet that indicate that while audiophile grade equipment seeks to avoid the distortion you are speaking of, other audio equipment such as some guitar amps seek to embrace it. So for the lay person like myself, while what you have indicated is very likely if not completely true in most cases, it seems conceivable that it may not be true in all cases. Meaning, while most people may perceive those higher end harmonics as irritating, I'd venture to say there are those that welcome it to some degree or another.  
I recall reading a number of articles on the Internet that indicate that while audiophile grade equipment seeks to avoid the distortion you are speaking of, other audio equipment such as some guitar amps seek to embrace it. So for the lay person like myself, while what you have indicated is very likely if not completely true in most cases, it seems conceivable that it may not be true in all cases. Meaning, while most people may perceive those higher end harmonics as irritating, I'd venture to say there are those that welcome it to some degree or another.  
What you read on the internet about guitar distortion is obviously inaccurate. This might come as a surprise, but its the guitar industry, not the hifi industry, which is why tubes are still in production after all these years. The reason for this is simple enough: when you overdrive a tube amplifier, it rounds the the waveform rather than chops it off. If you have a grounding in physics, you know that the corners of the chopped off waveform are higher ordered odd harmonics which are very irritating to the human ear. Guitarists prefer the rounded waveforms of an overdriven amplifier as part of their 'sound' about which they are quite picky!! I play in a band FWIW and am involved in the local music scene and have seen this first hand many times!

As it sits the guitar industry sells many more vacuum tube amplifiers than the hifi industry does- in fact they dwarf the hifi community. So they can dictate to the tube manufacturers what tubes are important. That is why there are EL34s, 6550s, 6L6s, 12AX7s, 12AT7s, 12AU7s and the like- those are all guitar amp tubes.

Now if a guitarist wants more 'bite' or 'crunch' to cut through the mix, often he or she will add a stomp pedal that makes a certain type of distortion. Some of these do indeed make more odd ordered distortion! But as any guitarist knows they have to be used with care to get the sound they are looking for, which is often an emphasis and not how they play all the time.

@mapman This is just me of course but I don't like the ARC preamps for the most part. It does seem like their later ones are better, but you don't have to go back very many years and the earlier ones seem kinda dry (indication of odd ordered content or lack of bass??) to me. My opinion only of course!

@inna  no worries! I agree that Rasmussen is one of the best Euro designers. I regard it as a great pity that Gryphon was the target of a disreputable reviewer here in the US some years back! I was in the Gryphon room CES at the time that the reviewer threatened Rasmussen that if he did not let the reviewer have the amplifier review sample for free he was going to trash it in the upcoming review.  That is exactly what happened some months later; that is part of why I feel that bad reviews are unethical. **That** is a topic for a different thread!!