To Aesthetix users

Strange and surprising results

So I tried some of changes mentioned in my last post - with surprising results. The most important change in my mind was plugging the Aesthetix PS into the ExactPower. This however meant moving around a bunch of equipment, and I realized that I'd have to switch the 2 preamps with the Aesthetix PS and the amp in order for the plug to reach. This of course also meant that the ExactPower was further away from the low-signal components, as recommended by ExactPower themselves... so I was killing two birds with one stone. (Or doing two tweaks at once - an audiophile no-no of course!)

Anyway, did the switch, and realized at the same time I could no longer use my speaker-level inputs to my sub. They wouldn't reach to the new amp position. So I checked my sub's manual (ACI Titan) and realized - again to my surprise, RTFM! that ACI prefers you to use line-level inputs, not speaker-level. So I ran a spare pare of shielded interconnects from the second set of main outs on my linestage to the sub.

Fired up the system and it sounded dead. No bass - though if I turned up the sub far enough I could feel the woofer move. Strange I thought, it must somehow have gotten out of phase with the rest of the system. I switched the sub's phase switch to 180 degrees and presto, bass. (Obviously I have an inverting component or two in my system, but am not sure which, and am none the wiser after examining the manuals). In fact, much better sub-bass than I'd had with the speaker-level inputs. So I had a totally unexpected benefit from the changes!

In addition, the radio station had entirely vanished from speakers! Yay! But I was still getting the chuff-chuff-chuff sounds, and occasionally a very low hum or buzz (varying at different times). I moved the ExactPower even further away from the other components and this improved, but it's still there a bit.

But there was still something un-musical about the presentation... I didn't find myself drawn into my favorite songs as much, and the soundstage seemed slightly off.

So I powered everything down, unplugged the Io Sig from the ExactPower, plugged it back into the wall, powered back up the Io, waited the allotted 10 minutes for the PS to stabilize, then one by one powered up each of the other components.

And what do you know - the music's back, and the radio station is still gone. Seems it WAS position of the components - as Nkj suspected - that was the major culprit here. And Jim White's basic dictum - plug the Io directly into the wall - is vindicated.

I still have the chuff-chuff-chuff and hum to deal with, but everything I've listened to so far since this final change has been way more musical:

- Glenn Gould, Goldberg Variations (original Columbia ML 6-eye)
- Sibelius - Symphony No. 2 - Barbirolli (EMI UK colored postage stamp)
- Feeles - The Good Earth (Coyote/Twin Tone)
- Cat Stevens - Teaser and the Firecat (A&M brown label - prefer this to Island)

Will continue to report back. I have just the chuff-chuff-chuff and hum now.... in both speakers, slightly different sounding in each ... MUCH less annoying than the FM.

I think the next step will be to get the shielded umbilicals from Jim.

Thanks for everyone's patience during this typical audiophile journey, full of mistakes and wrong turnings but ultimately a happy ending...

Btw... I took this opportunity to add pictures of each of my components to my system profile, in case anyone wants to check out all this stuff we've been discussing... click the system link below.

Best
Patrick

Ikeda

Patrick

Here's the latest:

The chuff-chuff-chuff (like a steam engine) is growing louder - much louder - and is now more audible in the left speaker than the right. There is a buzzy 800 Hz-ish tone as well. The radio station has vanished since I moved the ExactPower. The Io is plugged back into the wall with stock power cord.

The sound can be isolated to the Io, regardless of which cartridge used. It does not occur on any other linestage inputs.

Cello's Red Rollers, which he so generously lent me, did not have any impact on the problem. Cello, I'll be shipping these back to you - thanks for letting me try!

Jim White thinks that I need a power filter between the wall and the Io, and recommends the single-outlet Duke from Running Springs Audio. I have contacted them and they will be shipping me an audition unit. Jim thinks this will be more important than using shielded power umbilicals.

In the meantime, however, the sound has grown louder, and continues to have that cyclical chuff chuff chuff, which makes me suspect an internal component in the Io. Perhaps a tube.

So shifting front-end tubes is my next task.

More as this develops.

thanks for all the continued advice, guys
Patrick

First tube-switching results:

I just switched the front pairs of 12AX7s - V1L and V2L into V1R and V2R.

The chuff-chuff cyclical sound and the 800 Hz buzz have now switched to the right channel. Still audible from the left, but much louder from the right.

I am now going to mix and match the tubes (I have marked them all.)

Patrick