Thanks Frank!, this is what I found:
Aryton-Perry Windings :
"In Aryton-Perry windings, a layer is first wound in one direction. After a layer of insulation, the next winding is wound in the opposite direction with the turns crossing every 180 degrees. "
The 180 degree crossing had me a bit confused, but if you think about the windings as a spiral, rather than a coil, it makes sense that the two windings would cross every 180 degrees, almost inevitably. I assume the windings are connected in parallel ie on each end.
It seems that a silver wire resistor would require a lot of length due to it's exceptional conductance. Maybe a very low value with no need of much dissipation could use very fine wire.
Nichrome wire is the traditional wire used. Surplus places have ceramic tubes for winding coils. Nichrome isn't hard too find. Get some of these tubes and spiral with nichrome for instant power resistors.
Non-inductive would require some clever high temp layer between the windings.
Of course most resistors aren't power resistors, so the non-inductive would be easy to make.
Well, there is a research project here for the Golden Eared:
Try winding resistors from different wire materials:
tungsten, various stainless steels, monel, nickel, platinum, copper, silver.
I've done a little work, who is going to check a chart for the resistance of various metals?
oh also found a cool Ohm's Law calculator on the A-P site:
http://www.riedon.com/riedon_calculator.htm
OK, what about those teflon tube sockets?
Aryton-Perry Windings :
"In Aryton-Perry windings, a layer is first wound in one direction. After a layer of insulation, the next winding is wound in the opposite direction with the turns crossing every 180 degrees. "
The 180 degree crossing had me a bit confused, but if you think about the windings as a spiral, rather than a coil, it makes sense that the two windings would cross every 180 degrees, almost inevitably. I assume the windings are connected in parallel ie on each end.
It seems that a silver wire resistor would require a lot of length due to it's exceptional conductance. Maybe a very low value with no need of much dissipation could use very fine wire.
Nichrome wire is the traditional wire used. Surplus places have ceramic tubes for winding coils. Nichrome isn't hard too find. Get some of these tubes and spiral with nichrome for instant power resistors.
Non-inductive would require some clever high temp layer between the windings.
Of course most resistors aren't power resistors, so the non-inductive would be easy to make.
Well, there is a research project here for the Golden Eared:
Try winding resistors from different wire materials:
tungsten, various stainless steels, monel, nickel, platinum, copper, silver.
I've done a little work, who is going to check a chart for the resistance of various metals?
oh also found a cool Ohm's Law calculator on the A-P site:
http://www.riedon.com/riedon_calculator.htm
OK, what about those teflon tube sockets?
They were skeptical that small differences in resistor construction could have any audible effect whatsoever (not unlike some people on this board).
But there was a clear and marked correlation between the physical differences and the sonic differences (OBTAINED IN A BLIND TEST!). It was this correlation that convinced these engineers that these are real phenomena, to the point that they made a new model of "audio" grade resistor to provide optimized sonic performance.
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I have found out the reason why the Sfernice RCK Bulk Foils sounded SO different. For the first time in 30 years, one of the reistors went dead after a light resoldering and so I performed an autopsy. It turns out that, unlike Vishays and Alphas who built in safeguards for the integrity of joints, the Sfernice ones have what looked liked spot weld very close to the lead out positions, with a spot of expoxy to reinforce the joint. The molding is also much less substantial. I couldn't revive the unit after 'extracting' the chip, but the ease with which one log came off points to a design defect.
Charles Hansen is right, design details matter and I would dampen the chips with spray on aerated teflon, not a thin silicone film which is probably not a desirable dielectric.
So foolks, believe your ears, not your speculations.
But there was a clear and marked correlation between the physical differences and the sonic differences (OBTAINED IN A BLIND TEST!). It was this correlation that convinced these engineers that these are real phenomena, to the point that they made a new model of "audio" grade resistor to provide optimized sonic performance.
--------------------------------------------------------------------
I have found out the reason why the Sfernice RCK Bulk Foils sounded SO different. For the first time in 30 years, one of the reistors went dead after a light resoldering and so I performed an autopsy. It turns out that, unlike Vishays and Alphas who built in safeguards for the integrity of joints, the Sfernice ones have what looked liked spot weld very close to the lead out positions, with a spot of expoxy to reinforce the joint. The molding is also much less substantial. I couldn't revive the unit after 'extracting' the chip, but the ease with which one log came off points to a design defect.
Charles Hansen is right, design details matter and I would dampen the chips with spray on aerated teflon, not a thin silicone film which is probably not a desirable dielectric.
So foolks, believe your ears, not your speculations.
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