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
Congratulations on your much improved sound performance! A high quality active preamp again demonstrating their value in obtaining improved enjoyment, music reproduction and emotional connection.IMO they are essential.
Charles,
Thanks. You need fork, knife and spoon to enjoy the meal. For a long time I used only knife and spoon. Phono preamp direct to amps. No preamp. So I am happy with this investment, and the somewhat muscular effect of the Einstein, being "half-blood" solid-state (in the power supplies), is interesting and perhaps quite a good thing in my context. Although the Callisto or MP-1 might give an even more refined sonic picture.
So far, the verdict has been in the direction of Callisto, but I like the OTL sound (or lack of it) so I am open to the MP-1 also. For now, for a lower price, the Einstein serves me well, also in the sense that I hear more of my phono and amp upgrades. The grip on the speakers is excellent. Perhaps a bit too muscular, not as refined as some preamps, can't judge, but a big step up for me. Budget did not allow the others (or, ideally, comparing all three). Albert, you are right that I am drawn to the Io Eclipse sound, all the more so since I changed from a worn Lyra Titan to a new Atlas nine months ago. This really sounds excellent. For some reason (German engineering?), with the new preamp, I have especially loved the sound with new elektro music like the "Vermont" LP. BTW I thought that a one-box solution would give less heat, but that is not the case, The Tube runs very hot, perhaps the equal to a Callisto with one power supply.

I had the IO Eclipse here and ran it paired with Einstein The Tube, Ypsilon PST 100 preamp, The Messenger, an Allnic L-3000 (original small transformer) model and Aesthetix Callisto Eclipse.

The part you need to know is the Einstein gets a massive upgrade when you remove the 12AU7 tubes and replace with 5814 CBS Hytron.

I don't think you can prepare for what that does to the Einstein, you might be happy for a long time. This takes away a bit of the electronic but preserves the dynamics and resolution. It's different than what the others I mention bring to the balance but all are very good quality pieces.
Thanks, Albert, for interesting advice, which I will follow. You probably mean the one 12AU7 tube (only one in The Tube mk2). Do you remember the type of 5814 CBS Hytron? There are some at Ebay, some with orange and some with blue letters. Some are called "CBS Hytron 5814 A Black Plates D-Getter". These may be the same tube, not sure.
@ Albertporter, Hi, Will the 5814 CBS Hytron tube go in the place of any 12AU7 tube socket that is used in other name brands of componets, never heard of this tube, where is it made, and by who, what is the projected life span, where do you get them from, Is there a specific year that is very good?