1. A "pal" nes ac adaptor works for a "Pal" snes too.
2. Gamecube,n64 and snes use the same A/V output so i used the A/V output from my n64 since i dont use it these days. A nes RF connector works too but the picture isnt great but playable.
Just figured i´d post this in case someone else has trouble with hookups for a snes
Edit
i´ve only tried using a nes ac adaptor for a pal snes so i cant say if it works for a Us verison of a snes..didn figure there would be a diffrence