Preamp Quandary - sonics vs. ergonomics??


I have been auditioning (buying and selling) preamps for over a year now. My only absolute criteria is that the preamp must be a fully balanced design that has low enough output impedance to effectively drive my McCormack DNA 500 amp (10K input impedance). However, since my system is in the living room, there are some ergonomic considerations including the potential for other users. After trying several, I currently have two pretty good but different preamps, an Atma-Sphere MP3 that is maxed out with teflon caps, regulated power upgrade, caddock resistor package, and user-applied 3M constrained layer damping sheets. It also has Jensen transformers for phono that I do not use. My other preamp is an Ayre K-5xe which is an outstanding ergonomic match with my CX-7e source. The comparisons are;

Ayre K-5xe - very user friendly, stays on all the time, uses the same remote as my CX-7e source, no heat issues, dead quiet, smooth sounding with tight punchy bass and adequate decay for a SS unit, no turn-on/off issues, heat, DC worries or other tube related concerns. In other words a competant performer which is the perfect operational match for my situation.

Atma-Sphere MP3; deep bass, dynamics that you can feel in your chest, well-extended for a tube unit and has that "rightness" only tubes seem to be able to provide, outstanding 3-dimensionality, and an outstanding midrange that puts the performers in the room with you. In short, this is the best sounding preamp I have heard in my system, but not the easiest to use.

Have any of you made a similar choice, and did you have any regrets?
mitch2
Thanks guys for your comments.
Tvad - you are right, I do like the McCormack and think it is an outstanding amp. I never have to worry about SS haze or grain with that amp, and I never have to worry about lack of power for the Aerials. I am curious whether your comment about boxing myself into a corner is related to using only balanced connectors, the lowish 10K input impedance, or both. If the impedance, I agree with you and have sometimes thought about other amps that might match it sonically and power-wise, with higher impedance. The most likely candidate is the JC-1's, although others I have considered are Mac 402's and Pass 350.5 (only 20K). If my pre to amp run wasn't 3M long, I would more likely try the single ended CJ Premire 350. BTW - I also agree fully with the last sentence of your second post which is well-stated.
To Jmcgrogan2; as weird as it sounds, the lack of a remote is the least of it, especially since almost all digital sources have remotes that can stop play or advance tracks. I almost like not having one for the preamp because I tend to set the level and enjoy the music, instead of messing with it all the time. The issue is more related to general tube things like heat, remembering to turn off the amp before the pre (A-S doesn't use a mute switch), differences in tubes, tubes wearing out, and that little bit of extra noise (although not much with the A-S). CMO has a good point, and I have considered a Calypso and ARC Ref 3, but probably not the BAT because I cannot afford the 51SE and I am concerned about the 6H30 "supertube." The models without the 6H30 (the 31 and 51) are said to lack resolution and high end extension, so I thought those would be a backward step from the A-S. I have tried the VTL 5.5 (nice and musical but poor soundstaging compared to the A-S), and the SF Line 3 SE (comparatively marginal bass definition and lack of "thereness"). I would like to hear the Ayre K-1xe in my system, but it is quite pricy. If I were to change everything, other combos in my price range I have thought about but not heard are Mac 402/C46, Calypso/JC-1's and CJ 350/P17LS2,P18, or P16LS.
The A-S really is a nice unit, but probably best suited to a dedicated room or single-operator system. I am listening to the K-5xe now, and it is very nice in every way, with no flaws or shortcomings, but just not quite the last degree of richness, clarity and dynamics that the A-S provides. If I had never heard the A-S, I would probably be perfectly happy with the K-5xe.
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How can you consider the ARC Ref 3, but not the BAT VK-51SE due to cost? Last I checked the Ref 3 cost more than the VK-51SE.

Strangely, when I spoke of maintenance cost of tube units, the problems I've had on the units themselves cost more than the cost of tube maintenance. Capacitors, displays, and other items. For some reason I've never had capacitor or display or any other problems with solid state preamps. I don't know if it's just bad luck or what, but my last two tube preamps cost me over $1500 in repair fees, and that's not including tubes, in a two year window.

That's why I say that I like the tubes, but they don't like me.

As for boxing yourself in, any item you buy will do this to some extent. Buy a CJ amp with higher input impedance and you may box out balanced preamps and/or difficult to drive speakers. Everything comes with limitating factors that will make one make decisions for proper system integration.
What if you decide to match up all of the impedence, balance/unbalanced, etc requirements, and the unit doesn't sound good to you? What if by buying a new amp to open up your preamp options, you wind up limiting your speaker options?

IMHO, it never ends. All items present limitations that will require careful matching on the front end and/or back end.
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