Replacing generic RECEPTACLES

If you have 12ga wire and a 20A breaker, just change the receptacle. 

If you have 12ga wire and 15A breaker, change the breaker and receptacle. 

laserjock1963

If you have 12ga wire and a 20A breaker, just change the receptacle

Check NEC and local codes. How long is the branch circuit? Is the wire in conduit or confined space? 12ga might not be sufficient and even when it is, it's a minimum spec. You can reduce voltage drop, for example, by using 10ga wire.

@laserjock163.........It is NOT on a dedicated line. 

tatooedtrackman,
Yes, I have tried first Hospital grade, then Telsa Plex, but the greatest and significant improvement is with Furutech, but not cheap.  The Furutech Wall Plate is also your futur
upgrade, but not cheap, but it works very well.  Enjoy music.