Take a look at the top of the line Mapleshade Records power strip. It mysteriously allows quieter background, combined with better transient speed and dynamics when my tube amp with original fixed power cord plugged in. Also, allowed better overall performance of the amp, and rest of system components, each of which has a different power cord, some fixed, some detachable. Never did get to upgrade the wall AC outlet, but seem to get similar benefits with this "after the outlet" power strip. At least, that's what fellow audiophiles who heard the before and after sound had to admit.
This is a lower cost approach than many of the highly recommended power conditioners. But, there is no built-in defense against power line surge, lightening strikes, etc.
This is a lower cost approach than many of the highly recommended power conditioners. But, there is no built-in defense against power line surge, lightening strikes, etc.