"I can believe that.
However, I have heard similar results using certain power cords in three different systems, both tube and solid state. Furthermore, the effect of different models of a particular brand have had predictable results on specific components. This leads me to the conclusion that the results of using these power cords can be estimated to a reasonable degree of certainty."
I agree with your statements. I guess I should try to be more specific. While certain pc's do certainly have a 'sound' that can be expected almost regardless of the system or components you attach them to; finding that 'rightness' that is almost transformative (the kind that generates raves for a certain pc), can be very difficult. Certain pc's can almost be described without being heard at all, based on an accurate description of gauge, conductor type and number, and length. But while a pc's 'coloration' may sound terrific with lower-powered tubes, it may be downright horrid with higher-powered solid-state. That doesn't make it good or bad IMO, just designed for a specific ac requirement.
One of the many things I'm struggling with in introducing my own line of pc's, is how to accurately market the cables to those people who have systems that will benefit the most from them. I certainly am not going to be one of those cable makers that claims their pc's sound great on 'anything'. That's nonsense, IMO. And I certainly don't want tons of bad reviews based on folks plugging them into systems that are nothing like the systems I'm designing them for.
But, then again, no guts, no glory, eh?