2 prong power cable

The jack has 2 male prongs. 

I used the PC from my Violectric HP amp and it fit.  That's a relief.  Onward to PC shopping. Any recommendations for PCs that help with imaging and maybe deepen the soundstage?

Since I can't post a picture I'll try to describe it the best I can.

The power receptacle on the Marantz has 2 straight blades of the same size (which is smaller than the blades of an old extension cord from the 1960's or earlier).

The PC end that plugs into the Marantz has 2 female openings of the same size. The letter "N" is over the left side's opening and the letter "L" is over the right side's opening. It also has "10A 125V` SM" stamped on it.

The opposite end has 2 blades, 1 narrow, 1 wide. So I'm gathering from Note #9 in the Important Safety instructions that the wide blade makes the PC a polarized plug and is safe.

The writing along the PC says "(UL) SVT  E159216  VW-1  300V 60 degrees C  2x18AWG."  I'm no electrician so not quite sure what all that means. So how would an upgraded cord that has 3 openings for 3 blades be safe to use with the 2 bladed Marantz?  What happens to the wiring that is supposed to go with that missing 3rd blade? Seems to me their product is not meant for upgraded PC's.  Sigh...

What does a shielded PC do that wouldn't be good for the amp? When you say "install a 20 amp dedicated branch circuit" do you mean on the circuit breaker panel in the basement and how will that change the sound? Presently the amp is just plugged into a surge protector extension cord along with 6 other things.  Is that bad? 

Would an AC conditioner be a good alternative to the 20 amp dedicated branch circuit?

inrock,

Does the AudioQuest NRG-X2 2-Pole AC power cable improve the sound at all? If not, I think I'll just stick with what came in the box.

Blow it away how?