For my setup i've determined that it's an issue with the amp itself. If I jiggle the phono input selector button there is a bunch of static that comes through the speakers. And if i get it juussst right, the sound comes out ballanced. But one nudge and the sounds cuts out on the right again.
I'll have to take the amp into a repair shop I guess...
@mpitts
I have a Philips Electronic 312 hooked up to a JVC A-X2 amp.