wht power cable to use

Danovak, congratulations on the Brio-r! If it came with the typical 18g cord an upgraded pc should provide positive results. If I were you I'd spend a few weeks with the stock cord and then try others.

With my Arcam FMJ A19 I first tried a shielded 14g Belden. There was an immediate improvement in bass and dynamics. The sound was still a bit flat, hard and veiled. I then put a WireWorld Stratus on it. A very good improvement! Dynamics, tone, timbre, detail and resolution all improved and the background was quieter and blacker.

It was a great upgrade for a very reasonable cost. Also, I read somewhere that Rega was offering an upgraded power cord for the Brio-r as well.

The one that came with it. Use it for a while
Notec

+1
Hard to imagine an expensive pc will to be noticed on a $400 amp.

The new Pranawire Cosmos at 1/2 the price of the Avatar II would be a better match!

(Dealer disclaimer)

PS: In google just type "Pranawire prices" and please be seated......

just got a rega brio-r amp and would like to know what power chord would go well with it-

The one that came with it. Use it for a while

PranaWire's Avatar II should work well.

I have a Master Built that is just simply amazing if your interested.
It is the most "musical" I have ever tried.

Regards

Kevin