Aesthetix IO Sig V 2nd power supply & Lamm LP2 del

Hi Tim

good question. I think I will get the PH7 back for a another listen as they are in the same league.

I can comment on a couple of things thou.

The IO's bass is more dynamic and bigger in size, whereas the PH7 is a little tighter and does not have as much impact. For my musical tastes, the IO is a step ahead in that area.

Mid's and hi's, not sure one way or the other as I have new speakers, but the IO does seem to have a bigger presentation overall.

Both are more musical than my Xono, however both a lot noisier.
The PH7 only has 57.5 db gain (same as the Lamm), so I want to re-try it with my new speakers as they are a little more efficient.

At high volumes I remember I could hear slight transformer noise from the PH7.
From the IO, even at 62db, you get that wonderful ( not!!) tube rush - but no other noise. Please note at normal volume's you can't really hear the tube noise, but at louder volumes you can hear the tube rush between tracks and I would guess on quieter music tracks. I am not sure I can live that again. I used to have a cj prem15 and that was noisy like this as well.

Only really listened to it for one night, now I have the flu so everything sounds like crap - but the IO bass does rock thou.

I'll keep you updated.

Let me chip in with a couple of observations on the IO Sig. I have had mine for about a month (I am second owner of this unit 18 months old bought here on the Gon)and it superceded a hot rodded Sonic Frontiers Phono 1 SE with Amperex Bugle Boys. My speakers are 89db sensitive with ribbon tweeters that love to let you hear any tube noise going!

Both phono stages are in the sytem for direct comparison.

When I first powered up the IO Sig the tube noise became a big issue for me compared to what I was used to with the SF using a .25mv output ZYX UNIverse and a .15mv output Kondo IO-j. The SF has a 62db gain but is totally quiet even with the lowest output carts and no tube rush to speak of (function of the FET gain stage). With the IO, I found that I had to notch the gain jumpers back to 60db to reduce the tube noise and with subbing in various NOS Raytheons, NOS Brimars and regular electro-harmonix the noise issue basically went away. I concluded there was a noisy Sovtek somewhere and maybe just removing and replacing tubes cleaned up the tube socket connections. I also put on a top notch Granite silver power cord 10awg (with ferrite) and that seemed tame the noise a bit as well. I also found with the really low output Kondo, a 1:10 Tribute transformer that sounded horrible with the SF is just great with the IO and absolutely no ground hum whatsoever, which can be a challenge with some phono stages.

I can't fault the IO in any way with 1 power supply and if Jim says 2 are better, I am not sure my ears would be up to it even! My SF is competitive with most expensive phonos out there, but the IO just takes everything to a new level and it is the top of the food chain, putting pressure on the rest of my equipment to keep up. In comparison to the SF, the IO is more open, relaxed and dynamic all at the same time, the SF sounds a little closed down and veiled in comparison. It is also worth noting that background noise is also a function of appropriate loading to match cart impedance.

I have spoken to Jim White when the initial noise issue first depressed me and he was incredibly responsive both email and later by phone when I needed some info. I recently decided to send the units back to Jim for a tune up as they were used and even though I am a second owner, no warranty and living in Canada, Aesthetix have been wonderful in supporting me. My next decision is whether to get the Callisto to replace my SF Line 3 SE and the only concern (besides the cost) is if the heat will be much greater in my closed listening room.

Steve

This is a little off topic but has anyone compared the Aesthetix IO Signature to the phonostage in the Atma-Sphere MP-1 mkIII?

RadicalSteve

You state that you put the gain back to 60db??

In IO manual I have here the gain stating at ATT1 and going to ATT5 is 80, 74, 68, 62, 50. My manual says IO, not sig so I think it is an old manual.

Are impedance's from jumper position 10 - 1. 10k, 4.75k, 1k, 475, 243, 121, 75, 40.2, 20 , 10

Is anyone's else's manual different??

Shane,

You are correct as above - gain setting at ATT4 is attenuated 18dB to give a value of 62dB, not 60 - I was scribing during a quiet moment in the office, so a slip of the pen! The impedance values are as you describe.

My unit was approx manufactured 2 years ago as verified by Jim White, but the manual is revision 2.6 dated April 2002 and there is no reference to the signature version in the manual other than the warranty card. It might be 2002 was the time that Aesthetix recognised the issue with the old Mills resisitors and changed over to the Roederstein. The circuitry has not changed as far as I know from inception.

Steve