Tubes v. SS: can you mix and match?


Gentlepeoples - I was under the impression that a tube pre was always mated to a tube amp. Likewise, a SS pre would be mated to a SS amp. Of course, different makes and models of pres and amps could be mated, but I thought tubes should stick with tubes and SS should stick with SS, and never the two should meet. But this doesn't always appear to be the case with some of you. So, when and how are tubes mated with SS? Is it just a question of what sounds good? Are there any parameters at all?
webnick
I've been contributing to another thread which has gone in the direction of asking some similar questions. I'm going to snip and post some of my observations from that thread to this one in the hopes that some of the questions I ask may be seen by seen and responded to by more folks. The other thread started about Klipsch speakers. I'm not going to link to that thread as it is pretty long and there'd be much to sift through that is not to the point of this thread.

So here are some of my observations and questions regarding Tubes(+horns) sound as distinctive from SS sound. BTW, as a direct answer to the query of this post: Absolutely you can mix and match the two with excellent results. My reference system combines SET 300B's with Klipsch LaScala (horn loaded speakers). My taste runs along with Mahandave in that I've never heard anything that comes close to that sound (which is, needless to say, pleasing to my ears).

I'll try to snip the following down to just what is pertinent. The fine gentlemen I am referring to at different points are A'goners Bob_bundus and Tubeking:

...... I'm probably on another part of the audiophile spectrum than you and have only a fundamental understanding of the hardware, as well as lacking in ways to describe how it sounds to my ears (not hip to all the lingo, but I sure do know what I like).

I can't answer for Tubeking, but since I have a similar opinions about tubess+horns I can comment on what made me a convert. You will have to forgive my lack of audio-vocabulary to give creadence and color to my statements. The qualities that make tube amplification worth what little extra effort and $ it may take (though I don't know it's been a whole lot in my experience) are about air, atmosphere, soundstage and musicality. While SS has punch and dynamics in spades, bringing those quailities closer to a live performance in the way great SS can just knock the breath out of you sometimes....I do like that aspect of SS. What it lacks though, that the best of tubes, and even some really inexpensive tube rigs can impart, is a depth and airiness...an atmosphere that I've yet to hear SS give to music. There is a holography to the music with great tube amplification that I've never heard with SS. SS had the width, but lacks the depth in my experience (though I must say I was impressed with the Pass Labs Aleph 5 that I had for a short while in that it did have some sense of depth. I've also owned a tube rig that came close to having the 'slam' of SS (a Mesa Baron) but it was certainly at the expense of the atmosphere I get from my 300B SET amps. Ultimately I like the atmosphere over the amazing detail and slam. I was impressed at the detail listening to a good friends Levenson system. Around $50K+, wired well, in an outstanding room with NHT 3.3's (tight bass to write home about). We were listening to a cut on a Beethoven piano concerto disc I'd brought and was familiar with. By god I could hear the pianist feet on the peddles as he played. That was truly amazing. Yet still, bringing that same disk home to the SET amps, though it lacks that kind of crystaline detail (though the ALK's may bring much of that out), I just love the holography that is simply lacking on his rig. Another friend has a $100K Krell setup that raised the hairs on the back of my neck, but the novelty wore off as time went on and the listening session somehow grew tiresome. I never get tired of listening to my SET's and the sound remains engaging to me throughout, though poorly recorder music does become wearing almost immediately. I hope someone else may comment who knows more how to embellish their experience with all the fancy vernacular, or can add a different perspective on it.

That said, I very much doubt you did anything WRONG Bob. And, in fact, there may be nothing you are missing. Even if you listened to the two side by side you may still prefer the sound of SS over tubes. My bias is obviously strongly in the other direction, but I'm always open to hearing a system that will change my mind! I don't think it is a matter of either/or, but I sure love the combination of tubes&horns. For my tastes, I haven't heard better to this day.

Another post:

One thing Tubeking brings to mind in his response that I've been meaning to ask here: Just one more way I like tubes+horns......sitting there in the sweet spot you do get the full holographic effect and enjoyment of what they can bring to musical reproduction. But I also listen to my stereo at times when I'm not sitting in "the spot" (heresy!) and I've never read any posts on this. Perhaps no one wants to fess up....or do you all immediately shut down your system as soon as you leave "the chair"?! With my system obviously the holographic effect is lost once you leave the room. But one of the things I do like most about tubes+horns is that when I leave the room and go cook in the kitchen, or pound away at the keyboard in the office, it still sounds more to me like someone were down in my living room playing the guitar and singing (at best). The SS rigs I've owned and heard in others homes always seem to sound to my ears like there is a stereo playing in the other room once you leave that sweet spot and go off to another spot in the house. I think this can only be a generalization at best for me as my experiences are limited. It could also have a whole lot to do with the structure of the specific home and how the sound travels within that structure(?). But as a generalization it is certainly something I really enjoy about tubes+horns as well, and seems to be consistent in the limited experiences I've had. Can anyone else comment on that?

And still one more:

In an attempt to suggest a clue to the answer to my own question, .....and it may sound like I'm talking out of the side of my mouth here as I fully admit that I'm no sound engineer and the highly scientific and technical aspects of why this stuff works the way it does is as foreign to me as Chinese algebra. I had the pleasure once of visiting and speaking with George Wright of Wright Sound. When I asked him why tubes sound distinctive from SS, the explanation he offered had something to do with exactly how the two reproduced a signal. If you run a signal through a SS amp to an ocilliscope the graph will read as a stair-step hard straight line, rising and falling off like a cliff. Run the same signal through a tube amp and it reads as a curve, rising and falling off more gently. This reminds me of the difference between digital and analog reproduction where the digital represention of the curve of analog becomes a very fine stairstep that represents that curve. The other distinction that I've heard made is that tubes impart certain orders of harmonic distortion that our ears/minds equate more directly with music (or perhaps just as 'pleasing'). To further the description of what I like about tube+horn reproduction of sound that may relate to this: there is something about the way it lets the music just linger in the air and fade off that is very appealing and natural to my ears. SS tends to sound more abrupt and does not have the same sense of "lingering". OK, so enough of my butchering away at scientific (mis)information. Someone who is far more versed in this stuff needs to step in here and set me straight!

Marco
Marco, again I see myself in full agreement with your thinking. In practical terms this means in my case, that in the very complex system which I have built up through the years for myself, I have learnt to prefer all tubes preamps and amps for the midrange, class a solid state for the highs and SS again for the deep bottom end. Cheers,
The main parts of your question have been answered (The first rule is that there are no rules! - I am running SS preamplification with tube power amplification right now), so I'll try to answer your last question. The only real qualification that occasionally arises has to do with impedance mis-matches: Tube preamps *can* have highish output impedances, and SS power amps *can* have lowish input impedances, and the two factors combined *can* roll-off bass response. Axendo said it though - you rarely have to worry about this happening as a practical matter with most gear. One other thing to think about: The well-established existence of 'hybrid' gear, where tube and transistor circuits are combined within a single amplification chassis.
What are the parameters of highish output impedance in tube preamps and lowish input impedances in SS power amps to cause concern?

No real rules of thumb, eh?
I agree that you can do whatever you want. While I have used a tube pre with solid state power and all tube system as well, it occured to me (after many months) that mixing the two can be very nice but, I started wishing I had the best qualities of tubes or the best qualities of SS thru out the amplifier chain. In other words when you mix the two it compromises the best qualities of either, the sound was neither glowing with the sound of tubes or the real direct quality I associate with SS, it was smooth and detailed but missing a little of the magic of either.

Having said the above, I have always wondered what a SS pre and tube power would be like as you would have SS amplifying the lower signals and it would (probably) be quieter than a tube pre and the majority of the amplifying would be done with the tube power amp and you could get the benefits of the tube sound there.

Also what about the posts that mention that SS has only odd harmonics (or is it even?) and tube have only even harmonics? When mixing the two do you get neither or both? I have a hard time believing the even/odd posts, does anyone know of a link that proves this?

Anyway, enough babbling, just have fun :)