Upgrading power system

Out in the sticks we have world class poor dirty power.

I had a Furman IT-Reference 15i and it was a sound dampener. Amp/system sounded considerably better when Amp was plugged into the wall. Replaced that with a AudioQuest Niagara 7000 (before the price went crazy) and sound was not affected verses the wall.

I have found investing in linear PSU's also to be noticeable too.

YMMV.

How about a 4 wire 20 amp dedicated circuit I did one common ground ,one a insulated isolated ground on its own busbar, big improvement 

every connector in my Audio Chain including power chords and all connections in equipment either WBT, or Furutech ,it took me over a year all gold over  high purity copper. I very substantial improvement ,most equipment comes with gold over cheap brass conductors ,and $3 IEC inputs  I useOnly Furutech ,and Synergistics

research purple fuses which I only use 2 As big or bigger then the dedicated 4 wire 20 amp circuit. Copper is 3 x better conductor then brass and far less resistance.

@boxcarman

The improvement in SQ came with the new 20 amp outlet. Speaking of noise in the line, for those  who grew up in the 60,s, remember you couldn’t watch TV or play records when Mom was vaccuuming? Now THAT was noise. Vaccuums motors were not double insulated then.

Your old receptacle was probably in poor shape and just replacing with a new one of similar quality would have given similar results. The "boutique" receptacles are no better than Spec-grade receptacles that cost $5 instead of $0.50 ... As for electrical noise caused by old appliances in the old days, it had nothing to do with lack of "double-insulation". Those old motors were "universal" motors, which had a fluctuating electrical arcs from the brushes to the commutator rings, and no electrical noise suppression (i.e. capacitors and ferrites) to squelch that electrical noise. Nowadays, the vacuum cleaners and other appliances run brushless motors, and always have noise suppression to prevent interference with audio gear and TVs.

Quite a hodge-podge of suggestions, results. 

Did anyone comment on the Balanced Power Transformer question?

Two people mentioned that they had high thd% in their ac lines.

Others have world class dirt poor power.

I would like to measure mine.

Please tell me how to get this instrument?

The fact that you're using a 20 amp rated outlet will make no difference on a 15 amp circuit. You could use a 30 amp rated or 50 amp rated (I'm stretching here) and it would make no difference. The difference is in the quality of the outlet. You could take the same design in a 15 amp rated outlet and achieve the same result as your 20 amp. What matter is the circuit breaker in the box. You're only going to be able to draw 15 amps from that circuit no matter what the outlet rating. I just wanted to make sure that was clear.