The Norh comes from the same Thai manufacturer as the CAL players and is supposed to be the same transport and DAC as the Delta models. It adds a tube to the circuit which could be quite nice. I don't know how it compares to the Tjoeb or Heart, and I'm not sure how long it takes to receive one. I've never heard anyone rave about an AMC, so I'd stick with one of the others.
As far as tube versus SS...that would probably depend on the rest of your system.
As far as tube versus SS...that would probably depend on the rest of your system.