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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o_holter

Showing 11 responses by jafox

The Io's strengths are not at all detail or resolution that often is heard in the upper octaves. If you want a phono stage that is simply a leader in the class of portraying space and magic in the upper bass to upper mids, this is it…..in spades! It can be so addicting. But hearing modern designs with far fewer gain stages and passive components, you then quickly learn what the Io gives up in clarity, better delineation between notes (especially piano as they are not so exaggerated) and more appreciation to the upper octave instruments, and percussion.
Try the RCA 12BH7 tube in the Einstein's 12au7 socket. Magic magic magic when I tried this during an audition of the Einstein Line Stage vs. the Callisto Sig. I had at the time.

The coolest thing about the Einstein was that you can optimize the tube for each line input
O_holter - I first learned from another A'gon member of the magic of the RCA 12BH7 in the Aria WV5 preamp. He was right on about this vs. the 7602 that I have liked there. I then tried it the CAT JL3 amps in the 12AU7 socket and the same miracle….wow. And then it made its way to the APL Denon CDP with a major improvement of performance. Alex of APL was telling all not to use this tube in his players due to higher current demands but as this player on had one tube for the 2 channels, it worked mighty fine for years.

The major strength of the RCA 12BH7 is new level of clarity. This amount of grain caused by the other tubes shows how the RCA removes the smearing from note to note as well as lower-level details (percussion specifically) previously hidden.

As for the Einstein vs. the Callisto Sig., these both portrayed space with aplomb which says a lot as so few line stages truly get this right. To hear these two side by side for just a couple hours did not give me enough time to become familiar with the pros/cons or to pick a "winner". There was no WOW factor here like there was when I got the Aria WV5 a year or so later.
Audiolabyrinth please, let's keep this discussion to the thread title and not get another multi-page historical lecture on your cables.
Do I get a delivered pizza for the 12BH7 tip? 8-)
It truly is an awesome tube In every place I have tried it.
And the beauty of this is its low price compared to the others it seriously outperforms. Sometimes we just get lucky with value.
What I find interesting about tube rolling is that the effect, in my experience, is often bigger than the effects of changing power cords, feet etc.
Yes yes yes yes yes!

So happy you like the RCA 12H7. It is a special tube. I never heard a tele 12au7. But I tried many other 12au7's and 7602 and the RCA is the king for me.

Once you get your system tuned with tube rolling, then cable differences start to make a big difference. Start with IC from pre to amp, then put in a nice conditioner like the Running Springs. And then a top power cord into that. Then power cords for preamp and and IC from sources to pre. Finish with power cords to amp and finally speaker cables. This is the order for which things made the most difference as I did all the updates.
No No No on the Dominus with Aesthetix products. The Dominus B or C has the same faults as the Aesthetix products, i.e., over exaggeration of the middle octaves and suffering of detail at the frequency extremes. The Stealth Dream or Dream State power cords are vastly superior in tonally coherency here. Been there done this, but have since moved on.
Gosh, had I know the RCA 12BH7 was such a runaway hit here, I would have charged for tickets.
I have not auditioned or changed cables in 5 years. The system just sounds too good to have any desire to play the cables game any time soon.

For awhile I had all purist dominus cabling with the Aesthetix Io/Callisto, CAT amps and Manley DAC. I did have Joe Kubaka visit my home and fully install the KS emotion cables. This sounded wonderful but I ultimately prefer the Dominus overall even though i'd say the KS was the more "neutral" product line.

A year or so later, l I tried the mid level Stealth M5000 PC and it beat the Dominus at it's own game of 3D but with more bass foundation. From here the curiosity to try the Stealth Dream came and this PC brought on further refinements of tonal coherency. Little by little each Dominus cable was replaced with Dream PCs, the Indra Ic or Jade hybrid IC. I got a friend to try the Dream and he liked it but he told me to try the Dream State PCs. We swapped and shared each of these with each other and found that after a few months of playing, the dream state was unbeatable. They were very similar but the dream state, especially the Dream Catcher model, had phenomenal dynamic contrasts while giving up nothing in tonal coherency and 3D.

I use the Dream Catcher on the cat amps, the Running Spring Haley conditioner, Aria preamp and Lampizator DAC. The DS Veridical PC is for digital gear, but for beefy tube dacs, I prefer the Dream Catcher. But the Veridical worked best with the APL Denon player.

The DS Lucid Dream PC is the model targeted for amps but this cable was too colored for me every place I tried it except ironically for the Sound Lab speakers where it was perfect so I bought another for the other speaker. I was very surprised that a PC could have an effect here but it was only after all the other cable refinements in the system had taken place.
All - it is the RCA 12 BH7 red label which is the only 12BH7 tube I have experience with. I have routinely bought pairs of this tube for $40 or so which is a lot less than the insane prices for the great 6922 tubes that the RCA replaced in the Aria line stage. And yes, the Aria supports the 6v 6922 or the 12v 12au7 family with a flip of a switch. Gotta love it as the 12v tubes here take the unit to a whole new level even vs. the coveted Amperex 6922 pinched waist which now resides in the phono stage.

For you IO guys, if you want a little more treble extension, try just a single pair of Brimar 4004, a 12ax7 variant, in the last stage. I used Tele 12ax7's throughout in the IO but one pair of Brimars here added some upper freq extension that was quite nice.
The 6SN7 is an even better tube than the 12BH7 FWIW…
Yes, but sadly I can't use this any where in my system. 8-(