Preamp for Aesthetix / Atma-sphere


Hi

I have the Aesthetix Io Eclipse with volume and dual power supplies, Atma-sphere MA-1 monoblocs (140 watts) and Audiokinesis Dream Maker (93 db sensitive) speakers. These are great components. My question is about system synergy, how to make them play together.

I have been running the Io direct to my amps since I first bought the Mk2 version back in 2004. At the time, I had a Krell FPB600, and in that context, it was a blessing, and a great step up from the Krell KAV 250p preamp. I'll never forget my first impression with the Io - it was like going from the wooded hills up into the mountains. There was no going back.

With volume, the Io functions as a preamp. It looks like a preamp. Someone here on A-gon said going direct is best - which I interpreted as: it IS a preamp! So I thought, OK I have a combined phono and preamp - problem fixed. But it wasn't.

From recent testing I have finally become convinced that the Io does benefit from a separarate preamp. Even if clarity and detail is better going direct from the Io to the amps, the punch and "here-ness" of the music is clearly better with a preamp in the chain, at least in my system.

Trouble is, which preamp? I am testing a small solid state Musical Innovation preamp, which helps with the punch but veils the music. An optimal solution might be the Aesthetix Callisto, preferably with dual power - but I don't have the space, and I already have a lot of tubes and tube heat. I have space for one or possibly two boxes.

From what I have heard so far, a solid state might do the job well (in my tube-rich context), however it should not impart any s-state artifacts or reduce the resolution from the Io Eclipse.

The ideal would be to test a few tube and s-state preamps, and then decide. However, this is difficult where I live, so advice is welcome.

My question relates to my own setup of course, but is relevant for everyone with a top phono stage on the one hand and amps on the other. What is best in the middle?

From recent testing I have learned that problems that I thought were related to the speakers, the phono pre, the pickup and so on, were in fact related to the preamp issue. For example, the Dream Makers straight from the Io may sound a bit lazy and washed out in the bass, very clear in mid and treble but not fully embodied. Plugging in the solid state pre, the situation becomes dramatically different, now the speakers are driving, propulsive. Very enjoyable, but some detail is lost and some transistor things added that I don't want.

So I am looking for a solution with most of the plusses, and not much of the minuses. The preamp must be fully balanced with XLR in / out.
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Ag insider logo xs@2xo_holter
^^ Some of the new 6SN7s go for $200-$300/pair or more, while the garden variety of newly manufactured tubes are $35 apiece or less.

Some examples are Sophia, Psvane and TJ Music. All have some form of a 6SN7 or VT-231 available and all have gotten excellent comments.
Yes (we can also use them in our preamps). One of the driver tubes has a little more voltage on it, in your case the one that is at the edge of the chassis facing the power tubes. That one has to have either a -GTA or -GTB suffix if you use NOS; you can also use the Chinese tubes we use and most of the Russians too (although most of them do not hold up well).

It seems that a number of the boutique tubes don't have the higher voltage rating, so you can use them in all of the locations in our equipment except the one described.
An update:
Over the past months, partly due to tube advice given in this thread, I have been enjoying my Einstein The Tube Mk2 preamplifier a lot. Or more precisely, I don't feel I have a preamp problem anymore, and don't worry about it. It fills its role fine.

It does have a bit of solid state sound I suspect, but I am not much bothered by it, after the NOS tube upgrades (described above), and its assertiveness fits in nicely with the rest of my system and fairly large room.

A special treat, for me, is the ability to mix it in optimally. Since I have volume on the Aesthetix Io phono preamp too, I can mix and match. The sound is fatter and more organic with the Io taking most of the amplification load, and leaner and more precise with the Einstein taking most. A nice dialogue indeed. I like to have the Io volume at three o'clock and the Einstein at twelve or one o'clock, to get the best sound. This preamp is certainly delivering, and even if it was expensive, I got it more reasonably second hand, and am glad I bought it.