Hello Bruce,
I myself have been wondering very much about this topic and have found myself having a similar conversation with my father. I am quite new to HiFi and take about all the advice I can get (so anyone reading this please feel free to share your opinions). You could even say my interest in HiFi was sparked by my pop's interest. Anyways, my dad in his younger days loved music and became an electrical engineer out of his interest for acoustics. He was fortunate enough to land a job using some very ridiculously expensive test equipment, bruer and kerr (I think is how you spell it phonetically), supposedly its the best. I can't say from first hand experience because I chose to study computer science instead of following old pop's footsteps. Anyways, from what he has told me, this is the same brand of test equipment that McIntosh (I'm sure other companies as well) uses to design, measure and calibrate their amplifiers. This same brand also builds exteremly precise amplifiers (greatly exceeding the technical specifications of those used for HiFi audio) for vibration tables used in scientific research. Ok, whats the moral of the story? The equipment I mentioned earlier in the post all use "regular" or "stock" power cables.