Is it all in my head??

@roberjerman:  Exactly!!  I think I agree but i think there might be more variables at play... for example, I think the act of moving the equipment and ensuring everything is "connected" might in itself clean off enough oxidation that sounds seem "fresh"?  Actually that is a good way to describe it too...it sounds like someone changed the sheets. :P

If PC's made a difference why are all the enthusiasts so unwilling to do this simple test? 

Polishing the blades on PC's with Copper Brite was a tweak I read about years ago!

 I am retired electrical engineer.   I bye reasonably priced power cables.  I’d buy for geometry and shielding. Pangea  signature series works for me. 

I am not surprised, roberjerman, a well known power cord troll ( he trolls on other things as well ), has shown up. Give this thread some time, and I assure you, others will follow, as he has plenty of company. To not trust your ears, is something I am always amused at. Why are folks in audio land spending money on better amplifiers, better speakers, room acoustics tweaks, etc., and so closed minded to other things audio. Why are so many of these trolls not willing to try some power cords ( they are inexpensive enough ). My guesses are, they know their hearing is bad ( from being in bands, etc. ); do not want to find out, or admit, their hearing is bad; their equipment is old and do not have iec inlets; to hear some of these changes and differences, they have an  " acute " shortage of experience in listening for fine details; the system they have does not have high enough definition or detail. Some of them, as above, have many systems set up throughout their home, and none of them are high definition. Who knows ? Trolling will never stop, because, and this was stated from another power cord thread, " it goes much deeper than the cords themselves ". Keep in mind, I not looking to gain any popularity contests with these trolls. I just call them as I see them. Enjoy ! MrD.