BudP said:
George Cardas has a similar explanation for the changes that take place within the first few hundred hours.
Are amorphous cores in general audio use these days? Link to core mfrs.?
Have you tried any films beside Mylar? Although I think something like polyprop would be thicker and weaker.
In any event, I thought it a very interesting post. Again.
Well, at the expense of sending you off to spend your money with one of my respected competitors, there are three places I would go, for amorphous core transformers.
First would be Tribute Audio at http://www.tribute-audio.nl/
Makes the best input splitter transformers in the world. Pieter's transformers are highly thought of by other curmudgeons, like Romy the Cat and Lynn Olson.
Next would be here http://www.intactaudio.com/
Intact Audio makes C core SE OPT's of exceptional quality and since they are 100% custom designed and Dave Slagle will keep at it until you are satisfied, this is a good place to go first.
Finally I would send you here http://www.lundahl.se/
Lundahl makes a wide range of devices with amorphous core. They are a bit generic in their attempt to suit many uses with a single transformer and so can suffer by comparison with a purpose designed device, but their quality is first class. They have a first class distributor here in the states at K&K audio and Kevin is a great guy to deal with.
http://www.kandkaudio.com/
As for my use of Mylar? Only as a dielectric containment. A final wrapper around the coil, to match the dielectric constant supplied by the walls and winding base of the glass filled nylon bobbins we wind into.
The actual signal dielectrics are a much higher performance material, that is not permeable with the vacume impregnated polyester resin we use, to quench corona and form the dielectric "lens" that focuses the E Field / D Field interactions, across the signal dielectric barrier, between primary and secondary coil antenna events, within the ferrous boundary, provided by the core.
We do pay very close attention to the permitivity of our completed coil structure and the permitivity of the very low hysteresis storage, core construction of the commercial E/I core we utilize. We use this material because it is out of the picture, sonically, by about 400 Hz.
Meaning that the permeability is so low by this point, that it no longer adds a distinctive distortion to the antenna event, in the coil. Amorphous core stops working at about 18 kHz, so it's signature is available across the audio bandwidth. For reference, 80% nickel stops at 7 kHz and 48% nickel at 3.5 kHz. Core provides distortion if it is operating within it's permeability window.
Our philosophy is to dispense with core activities as soon as possible and use proprietary construction techniques to eliminate about 70% of the materials reminence. Other philosophies use the inherent low reminence of amorphous core but must put up with the core influenced distortions across the frequency bandwidth. Typically amorphous core OPT's use a "slower" dielectric to modify the energy transform from E Field to B Field, at field vector change moments, to keep the amorphous core's initial inductive spike under control.
There are other design philosophies at work at other manufacturers. My opinion is to try as many as you can afford to, and use the ones that suit the other limiting factors in your system and your personal taste in reproduced musical character.
Bud
First would be Tribute Audio at http://www.tribute-audio.nl/
Makes the best input splitter transformers in the world. Pieter's transformers are highly thought of by other curmudgeons, like Romy the Cat and Lynn Olson.
Next would be here http://www.intactaudio.com/
Intact Audio makes C core SE OPT's of exceptional quality and since they are 100% custom designed and Dave Slagle will keep at it until you are satisfied, this is a good place to go first.
Finally I would send you here http://www.lundahl.se/
Lundahl makes a wide range of devices with amorphous core. They are a bit generic in their attempt to suit many uses with a single transformer and so can suffer by comparison with a purpose designed device, but their quality is first class. They have a first class distributor here in the states at K&K audio and Kevin is a great guy to deal with.
http://www.kandkaudio.com/
As for my use of Mylar? Only as a dielectric containment. A final wrapper around the coil, to match the dielectric constant supplied by the walls and winding base of the glass filled nylon bobbins we wind into.
The actual signal dielectrics are a much higher performance material, that is not permeable with the vacume impregnated polyester resin we use, to quench corona and form the dielectric "lens" that focuses the E Field / D Field interactions, across the signal dielectric barrier, between primary and secondary coil antenna events, within the ferrous boundary, provided by the core.
We do pay very close attention to the permitivity of our completed coil structure and the permitivity of the very low hysteresis storage, core construction of the commercial E/I core we utilize. We use this material because it is out of the picture, sonically, by about 400 Hz.
Meaning that the permeability is so low by this point, that it no longer adds a distinctive distortion to the antenna event, in the coil. Amorphous core stops working at about 18 kHz, so it's signature is available across the audio bandwidth. For reference, 80% nickel stops at 7 kHz and 48% nickel at 3.5 kHz. Core provides distortion if it is operating within it's permeability window.
Our philosophy is to dispense with core activities as soon as possible and use proprietary construction techniques to eliminate about 70% of the materials reminence. Other philosophies use the inherent low reminence of amorphous core but must put up with the core influenced distortions across the frequency bandwidth. Typically amorphous core OPT's use a "slower" dielectric to modify the energy transform from E Field to B Field, at field vector change moments, to keep the amorphous core's initial inductive spike under control.
There are other design philosophies at work at other manufacturers. My opinion is to try as many as you can afford to, and use the ones that suit the other limiting factors in your system and your personal taste in reproduced musical character.
Bud
Oops, I meant to be asking for links to the amorphous cores/materials themselves; just out of personal curiosity. I spent some time designing magnetics, but they were ferrites for switching supplies or grain oriented silicon steel for line supplies. Amorphous cores were just on the horizon then.
And again thanks for educational posts...
And again thanks for educational posts...
Curmudgeon
Try here, lots of data and nice tools to work with.
http://www.metglas.com/
There are others but these guys started it.
Bud
Try here, lots of data and nice tools to work with.
http://www.metglas.com/
There are others but these guys started it.
Bud
planet10 said:
Yes, absolutely. Just like training and experience is required to run longer and faster. It takes quite a bit of training to run 100m in less than 10 seconds, though perhaps there might be an extremely rare individual who can do so naturally, with little or no training.
planet10 said:
You betcha, statistically, some participants here will be able to run faster than others, run 100m times that others will simply be unable to do no matter what. How do we know? Well, it's quite easy. You electronically time them running on a precisely measured 100m lane, with controls in place, like wind speed and certain track parameters, etc.
Now suppose there are participants, lets call them "audiophiles", who brag, boast and boldly claim repeatedly that they can run 100m in less than 10 seconds, but only on their special, self constructed tracks, in their backyard, by themselves or in front of select relatives/friends, using their own method of "timing".
That they have "trained themselves through experience" to run this fast and can tell exactly how fast they were running to within 0.1 db, excuse me...seconds
, without even looking at a timer, etc, etc. (but that this took months/years to get exactly right)When asked to demonstrate this rare ability on an olympic track, electronically timed in front of officials, they absolutely refuse to do so and come up with every excuse under the sun as to why olympic tracks are flawed, why electronic timing is useless, why unfamiliar witnesses causes stress that slows them into running 14+ seconds, etc, etc, etc, etc....
Then sane people laugh at their claims of greatness and refusal to demonstrate, angering and frustrating the claimers. But, of course, in no way slowing the claims, safely sitting behind a computer keyboard.
Sound familiar?
cheers,
AJ
supposed contempt
If you don't see it, here's a clue;... it's due to the presentation of presumed superiority and authoritative comprehension of psuedoscientific technobabble w/o a shred of supportive evidence in validation of misrepresentations in a tone of patronizing self aggrandizement...
(back to lurking)
John L.
If you don't see it, here's a clue;... it's due to the presentation of presumed superiority and authoritative comprehension of psuedoscientific technobabble w/o a shred of supportive evidence in validation of misrepresentations in a tone of patronizing self aggrandizement...
(back to lurking)
John L.
All my friends are really impressed by my speakrs...well, we have heard that before what they actually hear I dont know, because they dont really hear what they are capeable of...they are not used to analytic listening, and are easily impressed since their own gear is not worth talking about...I suppose that sheer musicality is easily understood by everyone who loves music
I have other friends at the other end of the country...they are not impressed at all, and really dont think much about my gear...they have very expencive stuff which actually doesnt sound better to me, on the contrary...ofcourse I think mine is the best, but I dare not say that...hopefully they dont read this
what they actually hear I dont know, because they dont really hear what they are capeable of...they are not used to analytic listening, and are easily impressed since their own gear is not worth talking about...I suppose that sheer musicality is easily understood by everyone who loves musicI have other friends at the other end of the country...they are not impressed at all, and really dont think much about my gear...they have very expencive stuff which actually doesnt sound better to me, on the contrary...ofcourse I think mine is the best, but I dare not say that...hopefully they dont read this
Well I guess it's true Music is all about stimulating an emotional response. As Audiophiles we seem to have done away with the music and gone striaght to the emotional response.
We have turned medium into the message, anyone reminded of Marshall Mcluhan who famously coined the phrase "The medium is the mesage"?
Marshall Mcluhan
Anthony
We have turned medium into the message, anyone reminded of Marshall Mcluhan who famously coined the phrase "The medium is the mesage"?
Marshall Mcluhan
Anthony
Applause!AJinFLA said:
Now suppose there are participants, lets call them "audiophiles", who brag, boast and boldly claim repeatedly that they can run 100m in less than 10 seconds, but only on their special, self constructed tracks, in their backyard, by themselves or in front of select relatives/friends, using their own method of "timing".
That they have "trained themselves through experience" to run this fast and can tell exactly how fast they were running to within 0.1 db, excuse me...seconds
When asked to demonstrate this rare ability on an olympic track, electronically timed in front of officials, they absolutely refuse to do so and come up with every excuse under the sun as to why olympic tracks are flawed, why electronic timing is useless, why unfamiliar witnesses causes stress that slows them into running 14+ seconds, etc, etc, etc, etc....
Then sane people laugh at their claims of greatness and refusal to demonstrate, angering and frustrating the claimers. But, of course, in no way slowing the claims, safely sitting behind a computer keyboard.
Sound familiar?
cheers,
AJ
Why not? You've been happy to ask for other people's gear list, so why not ID The cables?Andre Visser said:
Though many runners demonstrated the ability to cross the finish line in under 10 seconds, they were unable to do so repeatedly that day to a statistically significant degree in consecutive trials. Researchers were instead shocked to discover the times were well over 10 seconds in the majority of runs. From that they concluded the original claims of superhuman speed were proven false.
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