Ozzy. Cotton as a high voltage dielectric "can work", but this has to be approached in a dielectric hybrid manner. Stupid is as stupid does!
Power Cable Break In - Such a Change!
I installed a new AudioQuest Dragon Source power cord from my Lumin X1 to my Niagara 7000. The power cord from the wall to the Niagara 7000 is also a Dragon but the High Current version. I bought that cord used.
So, when I first started using the new power cord everything sounded great. However, after a couple of days I started hearing a strident sound. Especially in the upper mid/ treble region. The bass was also constricted. I started blaming the sound change on another piece of equipment that was installed concurrently.
Now, I was under the impression that the Dragon power cord with its DBS system required no break in. But I did inquire about it to AudioQuest who responded that it would still need about 150 hours to break in. It's been close to that now and sure enough yesterday I started hearing the glorious sound that I heard from day one with the power cord only perhaps better.
I must say the difference during break in and now is quite remarkable, I don't remember any other power cord going through this amount of dramatic change.
ozzy
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When I bought my turn-of-the-century built home: much of the remaining wiring was still varnished cotton insulated. As cotton was recognized to be a not-so-great insulator, that kind of wiring was threaded throughout the house, captive in ceramic spools (knob and tube wiring), like this: https://www.canadianhomeinspection.com/home-reference-library/electrical/knob-tube-wiring/ Of course: that was before we figured out how to synthesize the plastics and rubber substitutes, that are better insulators. Cotton has an excellent, very low, Dielectric Constant, but: mixing it with another material will add that material's Constant to the cotton's. That includes: laying the cables on the floor/carpeting. A concept many don't understand, but: why some will hear differences, in their homes/systems, when using cable lifters. Here's a PDF chart to save, that may be of use far as choosing materials, for the DIY cable guys: https://www.kabusa.com/Dilectric-Constants.pdf
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