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In Reply to: RE: Ultimately... posted by aknaydenov on October 04, 2015 at 13:34:40
"Of course I'm describing a diode effect. Why not imagine the wire as PN junctions connected in series. Impuritiy like copper oxide II is considered a P semiconductor."
If this really were occurring to any significant extent then it would presumably easily be verifiable by means of measurements. Much more reliable than putting the signal through a distorting amplifier, followed by a probably even more distorting loudspeaker, and then through a pair of ears with the associated psychological factors associated with the brain.
And if one did believe that the wire had a directionality caused by some sort of diode effects, then surely one would then want to use two parallel (well actually, anti-parallel) runs of wire, to balance up the two directions?
Personally, I don't think any of this is remotely plausible, but if one did believe it, then anti-parallel wires would be the way to go, I suppose! (OMG, doesn't that even go beyond someone else's "parallel runs of wiring" that we sometimes have to endure on these forums?!!!?)
Chris
Follow Ups:
And it isn't measurable yet. At least not with the tools most of us measure. I'm still thinking about how to do it.
"And it isn't measurable yet. At least not with the tools most of us measure. I'm still thinking about how to do it."
Well, as I've argued, I think it is overwhelmingly more likely that there is no effect there to be measured, and that the difference in sound between the two wire directions is imagined.
However, let us suppose for a moment that you were right, and that there were indeed some significant asymmetry in the wire. Is your idea then that with the wire oriented one way, there is a positive advantage, in comparison to an "ideal" symmetrical wire? Or is your idea instead that an asymmetrical wire is an unfortunate evil, but that with one particular orientation it does less harm to the audio signal than when it has the opposite orientation?
If the latter, then wouldn't that suggest you ought to try the experiment of putting two runs of wire together, with a "positively oriented" wire in parallel with a "negatively oriented" wire? Then, you would eliminate the asymmetry that you believe to be present. Of course you could also achieve a symmetrical arrangement by connecting two equal lengths of wire in series, one oriented oppositely to the other.
So there are two further configurations that you could try out with your listening tests!
Unfortunately, I think the dream that you will uncover deep truths that transcend known physics and electrical engineering by playing around with a home stereo system is just that; a dream. Conceivably you might learn something about human psychology and the way the brain processes its sensory inputs.
Chris
Chris,
I suggest the second thought. Each wire has its inevitable direction.
Your experiment of putting two wires with inverted directions in parallel sounds interesting and I will try it. What keeps me from applying it into practice is the double cost.
I will share my results when possible.
How do you handle interconnect cables or speaker wire where both conductors are optimized in the same direction? Because that's no good in your world. The return conductor must be opposite to the signal conductor as the current is flowing in the opposite direction.
Have you taken that problem into account?
If I cannot reverse a commercial cable, I leave it alone and consider it as a irreversible limitation. Interconnects have an optimal direction, even with the shield disconnected. I'm an owner of Furutech 13S and I found out the manufacturers didn't go wrong with the arrow pointing direction.I've also split Audioquest rocket 33 speaker cable in the past. By reversing directions, to my disappointment I found out it only got worse and the original direction was best. Audioquest also support wire directivity theory.
One of the reasons I started building my own cables is to be sure they won't have wrong with directions.
I have a pair of unshielded handmade RCA cables that have a very different tonality when plugged in reverse. This can be an advantage for different systems.
Edits: 10/05/15
"One of the reasons I started building my own cables is to be sure they won't have wrong with directions."
It's interesting to me that you are concerned about the direction of wire but you use triode wired pentodes that are clearly not as linear as true triodes.
In my mind we should take care of everything that is clearly understood before we move on to the other things.
Just saying.....
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Judging from my personal experience, cable distortion is audibly different from tube distortion and one doesn't entirely mask or compensate the other.
Despite this, on paper 6P45S wired in triode is very, very linear and rivals many triode. Please "google" its curves and check it out.
Have you got a set of curves better than this? This is all I could find.
"Despite this, on paper 6P45S wired in triode is very, very linear and rivals many triode. Please "google" its curves and check it out."
The spacing gets wider to the left and narrower to the right.
The plate voltage changes 200 volts in one direction but it only changes 160 volts in the other direction for the same grid change. That will cause a lot of harmonic distortion.
That is not "very, very linear". It's not even close to what I would call linear.
A 45 is very, very linear. A 2a3 is very, very linear. Hell, even a 300b is very, very linear compared to what you have.
Linear is when the plate voltage changes the same amount, left vs. right following the load line, as the grid voltage is changed from the idle point.
Sorry, maybe you have a better looking set of curves.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Yes, my mistake.
It can be considered linear only in a narrow region, swinging 39V RMS.
This translates into ~0,6W RMS output, which is enough for me to listen to a wire's direction.
Yes, you are right.39 VRMS is about 55 volts peak. 110 volts peak to peak. The tube is quite linear for that portion but becomes non-linear beyond that.
What speakers do you use?
.6 watts can be plenty, depending on the speakers, to listen to music not just wire direction.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 10/06/15
Currently the amplifier is wired to these sepakers:
https://www.youtube.com/watch?v=JaV4e9ikNgs
My speakers are about 97db for one watt. Because of the gain structure of my system I can only get 2 watts from my 300b amplifiers. I only play midrange and treble with my tube amplifiers crossing to a SS amp at 200Hz into a pair of JBL 2231's.
That gives me a peak volume (assuming I'm in the reverberant sound field and I am) of 103db. This means if the peak over average range of the music I listen to is 16db, I can listen at 87db average.
Your speakers are 95db for 2 watts. That's 92db one watt. So with two speakers and .6 watts per speaker that's just a little over 92db peak total.
Listening to the same music as me, your average listening level (while not clipping the peaks) would be just a little over 76db.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
"I have a pair of unshielded handmade RCA cables that have a very different tonality when plugged in reverse."
Try running a 20hz to 20khz sweep at 100mv in both directions. REW is free software that can do this with any PC based sound system as well as plot any differences.
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