Best Power Cord for Phono Stage

A standalone phono preamp (tube or ss) should have a separate PS to be worth its salt (with a VERY FEW expensive exceptions;--) -- and those (separate power supplies) will have RFI filtering built in.

A phono'stage' customarily refers to a built-in phono preamp section in a normal preamp or a receiver. And you have to decide how much differenc a special power cord would make in that situation.

Even with a well designed phonostage with an outboard power supply, the power cord which you use can have a rather dramatic impact on the sound. Two cords which sound very different but each of which is superb are the Bybee Millenium and the Jorma Prime. Both incorporate Bybee modules which seem to work well in this application.

Does anyone know if the Jorma Prime has a phono cable that is a straight or 90 degree DIN to XLR?

They can build anything which you want.

No such thing as a dedicated phono stage power cord IME. You have to experiment and try them out in your own system one at a time, like the rest of us do.