Questions about Preamp Tubes


Hi,

I was thinking of buying a preamp (tube and SS). Will the tubes need constant replacement? If yes, then I would rather just use SS preamp to save myself the trouble/cost. My understanding is that it becomes very, very hard to differentiate between tube/SS in high-end products; however, is this the case in lower-end models? Will it still be the case in cheaper/older preamps by Audio Research and Conrad Johnson (those were the ones I was looking at)? Obviously I will try to try any preamp out if possible to test for synergy, but I don't want to consider tube preamps at all if they have the above problem.
freckling
I am currently comparing two highly touted phono-preamps and to my ears it is exactly as Newbee has pointed out. There is the SS, which was raved about in all the mags, incredibly fast, delivering a mass of highly defined and detailed information, so much so, that at first listening I sat there with my mouth open, but soon I found the sound had an unnatural edge, a brightness which made me uncomfortable. On the other hand the tubed unit, where I found rise and decay in its micro timing much closer to what I am used to hear in a live event at my usual row in the hall. Where the SS unit almost explosively assaulted my ears, in perfect timbre yes, every instrument placed clearly on a magnificently delineated stage, the tubed unit did everything almost as well, just a tad less "dramatic", very liquid, but this had the SS unit too, apart from the fact that I heard practically no grain, no veil in its musical rendering, but the tubed unit had something galore, which is rare, it had bloom, it gave an idea of the aura around instruments, which you hear clearly in reality, but rarely in front of your rig. Now what we call bloom, to my mind and knowledge will only be made possible, if as Newbee has mentioned, the rendering of transients, rise and decay times are closer to the real thing, although per se it is a different kettle of fish from what we call a perfect rendering of transients, I believe.

Had not the "gestalt" of music been formed from early age on by live music for me, I would have fallen for the SS- unit. Its totally grainfree, incredibly detailed, dynamically effortless rendering of any kind of instrument, music and voices placed on an impressive sound stage is simply breathtaking. But something is wrong: You cannot say that there is no air. There is, but in a very subtle sense the music does not "breathe", one note is hardly finished and you already have the next thrown at you , perfectly carved out in absolutely perfect timbre everything, but in a very, very subtle, -exaggerated by me, however nonetheless irritating - sense. It is as if each note were somehow alone, does not properly coalesce with the next, as would be the case in the real world of music. The tubed unit does this right. Its musical rendering is much closer to my idea of the gestalt of music. But where bright lights are thrown, as if were, on the music through the SS unit, here the lights are a tad more subdued.

I won't mention names, the tubed unit his highly renowned but has never been properly reviewed, the SS unit is famous amongst reviewers. They describe it in the most glowing terms. Possibly they are less familiar with live music as the music lovers amongst us audiophiles. But then (grin) perhaps my set up is faulty, a fault most certainly kindly glossed over by the gentle and euphonic distortion of tubes......(;
Detlof,

Which two phono pre-amps are you comparing? What is the rest of the system?
Thanks for all the responses guys - you've answered all of my current primary concerns. However, I encourage you guys to continue your discussions at the tail end of this thread as I'm somewhat new to this audio hobby and am learning all the time. I'm enjoying reading what you guys have to say.

As far as specific equipment I am considering Thorman, I'm not entirely sure if I plan to buy a preamp in the very, very near future and am in a more factfinding type of stage, so I will leave that for a more pertinent time.
The issue of greatest concern with regard to the small signal tubes is not replacement but noise.
I also want to warn you that tube "rolling" is a very addictive hobby that could end up with you begging money from relatives for more NOS tubes.
I don't know in truth about longevity, I have had no new tube failures with the exception of power tubes. Some of the tubes I have were used for 7-8 years and are still fine. Others I run for a few months and they have become irritatingly noisy and a real bummer. If you shell outbig bucks for a special old stock tube and find it useless after a few months you are Sh** out of luck.
I wouldn't forgo a tubed preamp for a SS in a line stage simply because I like tubes. However I don't think of any tube being perfectly noise free when amplified in a phonostage. The order of amplification is so great it is nearly impossible to maintain a truly silent tube phono stage. Others will argue, you will see.
In any event Tube power amps or integrateds produce a bigger, more obvious, holographic three D sound stage, than any SS gear at any price, that I have encountered. Since I go to audio shows and am a member of a large audio group I have heard top flight SS gear. It sounds great but nothing like a tube amp.
In the end I think my AE-3 tube pre is a miricle for 300 bucks.
I happen to own a legendary preamp, which is one of those you mention, an ARC. An SP6B specifically, which is a generally admired and sought after pre given that it is 25 years old.
I prefer my little 2 tube AE-3 which uses 6SN7s. I happen to really like them but I haven't the resources to buy a SLP-05 for 7-8 thousand.
My two cents in summary worry about your power amplification!
If you use power tubes you will hear the tube magic. Don't fall for the tube pre is all you need bit. It is not true period.
If you want to use an SS preamp you will still hear the magic. The other way round is widely believed to be the case, ingnore the insane, hopeless, clones.
A tube in a preamp or preamp section of an integrated accomplishes nothing without using power tubes.
Good luck and believe me or just find out yourself it took me only 6 years of experimenting with tube preamps to hear Nirvana when I finally bought tube power amps.
Mechans,

Your points ring true. I'd agree you can get more inherent "tubiness" from a power amp than a pre amp since the signal transformation that occurs in the power amp is of much greater magnitude than that which occurs in the pre-amp.

But I think I would assert based on my experience that a pre-amp can provide a significantly more tube like sound if designed to do so as well. I've confirmed this on many occasions with my Carver c-6 pre-amp.

The c-6 is actually a solid state pre-amp that provides two sets of pre-amp outputs, one voiced like solid state and one voiced like tubes.

And yes, the tube output voicing does work quite well. It sounds very much like the better tube gear I've heard. The ss outputs do not. I'd wager that any set of ears familiar with the general difference in sound between ss and tubes could easily identify which is which.

The tube voicing provides a sound very much like what Newbee describes above. The solid state voicing in comparison sounds very much like what Newbee describes there as well in comparison.

So if a ss pre-amp is able to provide a more "tubey" sound, I have no doubt the real thing can as well.

The more I compare Carver's "mid-fi" stuff with other more blue blood designs that tend to garner more respect in the audiophile world over time, the more respect I have for what he was able to accomplish in terms of delivering good sound at modest cost.

How did he make a ss pre-amp sound like tubes? I suspect it has to do with the manner in which the gain is applied to the signal. With the ss voicing, dynamic range is clearly greater at the expense of microdynamics. With the tube voicing, the reverse is the case. In many a/b tests I've done with these two alternately voiced ss outputs over the years, the difference is clear as night and day.

This also leads me to believe that other ss designs can achieve a more "tubey" sound in a similar manner when designed to do so, without the the extra maintenance issues associated with real tubes.

I've heard a more tube like sound I think in ss systems from Musical Fidelity, Krell, and Classe, for example.

So in my case, I do like the tube sound and looks as well, but I'm not quite sure that the extra cost and headaches associated with real tubes are absolutely required to achieve the desired sonic results.

I also believe that while ss can be voiced for modest cost to sound like tubes, I'm not sure the reverse is true. The tube gear I've heard capable of resolving (this is different than microdynamics) competitively with good ss without losing the inherent "tubiness" of the sound have all been quite expensive.