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 23 responses by audiolabyrinth

Jafox, what do you use for power cords, and on what?, Thanks for all you help on this thread.
@ 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?
Thankyou Albertporter for your reply, very imformative!, I will write down this info and the Telefunken info, I do not like going down this rabbit Hole of tube rolling, Exspensive going thru so many tubes to get it right!, so I am going to attemt to get it right the first time, My player consist of three 12ax7 tubes, and one 12au7 tube, Do they make a cbs Hytron for the 12ax7?
@ O_holter, I look forward to your comparison of the CBS Hytron versus the Telefunken tube, what year and type of Telefunken 12AX7 tube do you have?
@ Albertporter, wow!, You are a asset to me, Thankyou so much!, I am doing extensive modds to a vincent cd-s7 player which single handily out performed the double the price Ayon cd-2s player in the vincent player's stock form,I am changeing the XLR out-puts to Furetech Ft-785m, and implementing a real balanced circuit inside the player, going with Tara Labs Internal Gen 2 insulated 24 awg wire, changeing the IEC to Furetech, changeing the Recepticle at the wall to Oyaide R-1 recepticle with carbon plate, and I Have The Tara Labs cobalt power cord with top Oaide IEC and plug on the power cord, The tube recommendations you have given are being noted to try, what year and type Telefunken 12AX7 tube is best in your opinion?, Thankyou.
Albertporter, I believe I have a 6z4 tube in the power supply of the player I have, what do you believe will be a good recommendation for that roll?
Thankyou O_holter, great post, this will be interesting to see if the Telefunken's are as good as the Hytron tube, @ Atmasphere, wow!, you are saying that we may or may not can use a 12BH7 tube in place of the 12au7 tube, I believe that was information was of grave importance!, thanks, welcome back to the thread.
O_ holter, What tube are you talking about sounded more solid state?, Also, what have you learned that sounded best for 12ax7 tube sockets?, and, If you do not mind, please give your full impressions of the 5814 cbs Hytron tube, A note here, I do not like tubes that do not have the tube magic, my tast is, if a tube sounds to revealing like 6h30 tubes, It sounds like solid state, I have so much resolution now, I would be crazy to get more!, this is because of the cables I have, I do have tube magic going on, However, they are stock tubes, and believe I may can get even more magic if possible.
O_holter, Oh No, you are confussed with what I tried to say, I use to have a very exspensive Ayon digital player that had 4 6h30 tubes that were Russian tubes stock, I bought another vincent digital player, same model that I had before the Ayon player, I did this because the vincent is way, I mean way more musical and real sounding for less money!,the vincent digital player has stock harmonix tubes and then chinese tubes, and then an american tube in the power supply, I have two 12ax7 tubes, one 12au7 tube, and a rare 6z4 tube in the power supply, This player has real tube magic to the sound, 3-dimensional, huge sound stage, very deep, tall, and wide, puts the Ayon to shame!,thats why I bought it the second time, I regreted tring to move up the tube digital food chain, The vincent model is the cd-s7, they just discontinued it, I got the last one in america that my dealer held for me, believe it or not, I learned the hard way, It's not about how much a componet cost, It's what the componet does!
The resolution I was speaking of are my cables, I have a small fortune in cables!
O_holter, I enjoy what you are saying about tubes, A learning exsperience for me, great stuff, thankyou for your time here!
I look forward to what you say, I really want to know the outcome of the Hytron tube, like, is it what the both of us like?, we both like emotional and musicality, so I trust your impressions.
Hi O_holter, interesting news about the RCA 12BH7A Black plates tubes, question- what the sound stage presatation like?, Is it up front and personal, forward sounding, or in the middle of the room and deep sounding?, oh, and about your fan, scrap that idea, get you a small battery powered fan that is quite, I believe I am going to have to invest in one myself, My amp seems to heat the house, the amp gets HOT, However, I want to keep alot of the heat off the amp, I do not mind Heat of pure class A operation, to me, It's like a jet engine going off, kinda awsome, cheers.
O_holter, wow!, sorry, I just caught up on this thread, I have been looking into many interest for my system, since I have only been building it for two years, at the cost of admission, this takes alot of time to obtain each piece, Very funny you mentioned a Krell FPB 600, well, you guessed close, I have a Brand New Modded Krell FPB 700cx amp that I am currently burning in, the good folks their at krell inserted all new 2014 improved caps that was not available in 2005 in this amp, and renewed the cosmetics as well, Oh yea, this thing gets HOT!, I enjoy vintage Krell Like this, yes, it does sound different than before, It has an uncanny way with treble, grainless, no brittleness at all!, mid-range is improved, of course the bass needed nothing to improve, however,LOL!, I only have 85 hours out of 500 of burn-in, sorry, let's talk tubes, tube products is my preference in front of this krell, I also agree, you should do long listening to be sure of your impressions, I admit, I have enjoyed following your tube journey, It apears that the RCA 12BH7 is of interest to me now, my question, to ever can help us here, How many variates does this tube come in?, you mentioned black plates version, Is there others? cheers to you O_holter for your contribution here.
O_holter, my speakers are 91 sensativity, 6 ohm that dips lower while playing music, 30hz to 27 khz cross over 900 hz 4 way design with sloped baffle bi-amp speakers, The JBL L-7 speakers with Tara Omega Jumpers with still points footers, then rotated out with polycrystal footers, the krell sounds even better at lowest volume, I suppose these improved caps do the trick, that was the first think I noticed when first playing this new amp, and thankyou for the congrats, it's been a long hard road to get to this point, I was without my system for a year, tell me more feedback on the tubes when you get a chance, cheers.
Damn Asa, that was one of the most informative post I was looking for here, Dude, Thankyou!
0_holter, Hi, Great to see you, My interest in the tubes is for my cd player which drives my amp directly to good effect, my amp is 100kilo ohms, very good match for driving an amp with this vincent tube digital player, and yes, speaker sensativity will have alot to do with it, I have incredible full sound on lowest volume, the krell is 3.58 volts to drive to full power, the vincent puts out 2.5 volts max, so I never over drive the amp, and as far as sound, I am looseing nothing, I have used the vincent on head phones set to full out put, I cannot hear a difference at all useing the volume control on the player running thru the entire system, and my speakers are a modest 91 sensativity, would love to have 103 sensativity like I did in the late 90s on a Krell FPB 200, that, my friend was awsome!, so basically, you are saying I need to check to see if I can even run the RCA 12bh7 in place of the 12au7 tube, i'm sure I do not have a bias control for me to set in a cd player, a technician could, I do not know enough about being tech savy to do this myself, Did you use telefunken tubes in place of the 12ax7 tubes?, if so, How did that work out?, did you try the telefunken 12ax7 tube?
yes that is correct O_holter, ok, That was the plan, I will waite untill the whole system is done with break-in, then do tweek up grades.
Jafox, my friend member name misternice just bought few stealth v-12 dream power cables, he lives in newzealand and austalia, He bought them used, I do not know how he did that, stealth just introduced the v-12 power cord?, anyway, he likes them alot, suppose to give me a run down of the sound when he comes back from vacation, cheers.
what would be a good improvement tube roll replacement for a recitifier 6z4 power supply tube?
Hi O_holter, great read on your follow up post, you know I followed this thread a while back, good to see you ole chap.