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In Reply to: RE: Normal-mode versus common-mode. posted by unclestu on November 29, 2010 at 15:33:34
Hi Stu!
"most cables employ a twist like a left handed thread. In fabricating power cables from scratch, I find and a right handed thread twist imparts a much "faster" sounding cable, indicating that there is a hell of a lot of inductances going on."
Hmmm, actually most of my powercords are flat. (Perhaps that's why I get a smooth, flat response?) I've never paid any attention to how cords are twisted, I'll eyeball them next time I'm in the hardware store. Do you think it affects their mutual inductance?
Putting the crystal in the center would certainly get it in the high field region. Lot of interesting things to look into and contemplate in this hobby...
You know what Stu? While I used the toroid you sent me to good advantage, I still have the crystals and blu-tack in my drawer. And I just went downstairs and dug them out! I'll play with them and see what I can hear and/or measure. The weatherman says this is going to be an excellent week for inside projects so all is good.
Well... except maybe for the heatpump which quit pumping yesterday. But surely, in the name of safety, I shouldn't work on it in the rain!
Regards, Rick the rationalizer
Follow Ups:
I use the toroid centered on the CD spin motor. Since the field is toroidally shaped the EMF field will drop straight down the center of the toroid and that's where the use of the crystal is very obvious.
And yes I do believe the twist affects the inductance. I used the braided Kimber speaker cable to test this out, using some cable with neutral colors ( you know my position on black wires). depending on which leg you select for the positive you can get either a left or right hand twist in the braid. The left hand twist as positive always gives a more open and "faster" sounding hookup, although for some reason it is normally the black that has the preferred twist.
This was rammed home as a Kimber dealer, when I got shipped some cable with the twists reversed. A customer came in who needed one side longer, so I cut off the length of the new spool and then he complained that his speakers no longer sounded balanced. When he returned both cables, a closer examination revealed that the twists had been reversed. I complained to Kimber and they have been very careful to standardize the braid ever since.
I also got a mil surplus power cord made of teflon insulated wire, interestingly. It was a relatively small gauge but did sound excellent, and while I have no doubt the teflon was a contributor, I did notice the twist was reversed to most.
Also in regards to power cords check out the Dale website (www.daletech.com). They market, for medical use, a low leakage power cord, something I have never seen addressed by any audiophile company. Their Euro color coded low leakage cables do sound quite decent, and are very quiet. The only difference I can see is that they add additional insulation between each conductive strand. ( I may have posted this to you already).
Stu
OK two questions:
1) If I want to max impact of crystals in a torroid, would I put them in a tube down the center?
2) How do I DIY a left hand twist? And from which end? I know this one must be ridiculously obvious, but I'm feeling sluggish today...
Thanks, Uncle!
Left hand twist is the direction of the threads on a normal screw. When a right hander twists wire, he normally twists in a clockwise rotation,That sounds a tad slower in my experimentation than if you twist in a counterclockwise rotation.
As for the crystals in a toroid I just center them within the toroid. Although if you do have those crystals drilled for jewelry you could run a string across the toroid and then center them. Remember the picture I posted of the crystals centered in front of a speaker?
Stu
Unclestu, I do understand about the "left hand twist" thing, though somehow I thought we had right hand screws in the US. See how easy it is to get those confused.
So how you view the spiral might differ depending upon which end of the cable you look from. Here's an easier question: I use my drill to do the twist on power cords clamping the receiving end and drilling from the source end; do I do it in forward or reverse to get the left hand twist?
Thanks and sorry for sounding so dense. Today ain't my day!
I think you're screwed both ways.
The threads are the same from either end. If you turn the screw CW it goes in (away from you). If you turn it around it still does, you turn it CW and it goes away from you.
I too thought that meant they were RH threads.
PS: In the name of science I went to the garage and tried it with a 1/4" bolt and nut just as a reality check this close to bedtime..
If you use a drill running normally you get a thread opposite to a standard bolt, whatever it's called. Just take your desklamp's zipcord and give it a couple twists by hand and you'll see..
Rick
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