When a power cord could obviously affect SQ

@mclinnguy the receptacle is Furutech gold.

I had ordered a set of ACME 2A3s but the order went pear shaped with import issues so I am using the RCA black plates.  My try EMLs eventually.  I have several 6SN7s to roll!

@retiredaudioguy 

I haven't tried every 2a3 tube out there of course, and never will, and I am not paying stupid money for RCA single plates, like I said I can change a cable elsewhere to get the same upgrade in clarity and resolution, and the advantage with that is the cable doesn't wear out, but my math tells me if I have 2 pair of output tubes to rotate the RCA's should last twice as long  

Looking forward to your power cord comparisons.

@erik_squires  Frank is correct about the cathode being directly connected to the AC if he is using AC filaments. A 2A3 is a directly heated tube, so the filament and the cathode are one and the same.

@richardbrand  said:

I’ve quoted your entire post because it should be mandatory reading!  You have provided direct evidence for the theory that it is EMI coming from your component that could make a difference. 

For years that was the reasoning for installing at least two dedicated branch circuits to feed an audio system. One for analog equipment and one for digital equipment. There was an electronics EE on AA that would say the reason was to decouple digital power supplies from analog equipment power supplies. If fed from one shared branch circuit the digital crap from the power supply of the digital equipment goes back out on the power cord to the same outlets on the shared branch circuit and travels into the analog power cord to the analog equipment power supply(s).

Today there are very good audiophile, grade, power cords for digital equipment that shield EMI/RFI from going out on the power cord to the wall outlet and onto the AC branch circuit wiring, that does not, use a traditional braid or foil shielding.

Braid, and or, foil shielding may have improved in resent years. From my      experimenting, listening, with them years ago, at least on my audio equipment, they sucked the air, life, openness, from the music.

Presently I am using WyWires Digital Power Cords Juice II Silver Series (6ft) that control EMI/RFI, in both directions, on my digital equipment. They do not use traditional braiding or foil shielding. And, they don’t suck the air, life, openness, from the music. 

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@jea48 

Presently I am using WyWires Digital Power Cords Juice II Silver Series (6ft) that control EMI/RFI, in both directions

Good information there.  Do you know how they work?

Could they be using the principle of unshielded twisted pairs?

Cheers