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In Reply to: RE: Found a candidate. posted by morricab on March 25, 2008 at 08:56:06
morricab: ""
Did you think about trying air dielectric? Nordost has a way to wrap a filament around the conductor such that it is (mostly) not touching anything. Only the filament. ""The foam approach essentially does the same thing by removal of a lot of the higher dielectric material and replacing it with air. What I am trying to do is minimize the overall dielectric coefficient. Since I'm using two flat copper braids, filament wrapping won't be an effective insulation for bends of the cable nor impact or handling of any kind. Only when the filament density per inch is high enough can I guarantee prevention of shorts, but that counters my desire of low epsilon.
My game plan is to use the least amount of dielectric in between but still retain insulation integrity.
morricab:""
Element cable is selling solid core gold and palladium interconnects with no dielectric (just a big hollow tube to protect the fragile wire. It is interesting because even though these are far from the best conductors, the material can be of very high purity and long grain boundaries. Also, the dielectric is not necessary to prevent corrosion. Wondering about your thoughts on the conductive material...""
At room temperature, it is not possible to use any electrical test whatsoever to determine the grain boundary aspects of a conductor. It is possible to measure a difference caused by an extended mean free path of the electrons at reduced temperature for some materials such as copper, but not too many people keep their wires at liquid helium temperatures.
For interconnects, hollow tubes are great, spaced wires are great, anything that can be done to increase the characteristic impedance of the interconnect gets it closer to the actual input impedance of the amp. The trouble stems from the lower limit on capacitance for a reasonable conductor geometry, as well as a practical upper limit on the inductance of the cables...trying to achieve both causes the wires to be susceptible to both magnetic as well as electrostatic induced error signals (noise).
Solid gold or palladium...I'd pass on that. Of note is the fact that both have higher resistivity, so the ground loop currents will be reduced. (since you audiophile guys have no specification on ground loop current sensitivity and transmissibility, you essentially are stuck with trial and error there).
Cheers, John
ps... It is not possible to have "no dielectric". Vacuum is a dielectric, as is air. While they actually meant "no dielectric formed to the conductors", there is still one comprised of the tube and the air, with the composite dielectric coefficient being reflected in the equation:
L * C = 1034 * EDC...EDC being the geometric composite of effective mu and epsilon. L in nH per foot, C in pf per foot. EDC can never be less than 1.
Edits: 03/25/08Follow Ups:
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