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RE: Well from a safety POV

Thanks for your concern. I am well aware of the cold flow characteristics of teflon. This is one reason why there the teflon insulated wire is then covered with a cotton sheath. The cotton provides a cushion layer to prevent the kind of forces that cause cold flow (as you may know, cold flow in teflon only occurs under certain circumstances).

But also there are very few instances of teflon cold flow causing actual problems. The types of issues that I've read about concern situations where teflon wires had been stapled to something, and over time the pressure on the staple caused cold flow and a subsequent short. The solution was to add some padding.

If it's not possible to get Teflon insulated UL wire, why can I find many many hits when Googling "Telfon Wire UL rated" One example is
http://www.specialtycable.com/ptfe_hookup_wire.html

The cotton sheath also has sonic benefits.

Second point : well firstly, I didn't make this point. But there's a lot more than simple 60Hz going on down the power line. The load that components put on a line is complex. It consists of bursts of power draw, 120 times a second, when the rectifier is switched on, and in-between these pulses there is virtually no current drawn. The sudden turn on and off of the regulator causes harmonics much higher than 60Hz. What's more, this mess is somewhat modulated (not really the right word) by the music, with the pulses being wider when the music is loud.

A more interesting question in my mind is "Why do power cords make so much difference"

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