I suggest that you check Bob's devices web site for his article on grounding problems and how to solve them. It is the best piece I have seen on the subject. You probably don't need a step up transformer with a .5mv cartridge but I can tell you from experience with many cartridges that a good step up transformer helps
the sound stage significantly on low input MC cartridges.
Finally, I would bet that you have a ground loop hum somewhere in the system. Make certain that all of your phono cables are far away form electrical components with transformers.
the sound stage significantly on low input MC cartridges.
Finally, I would bet that you have a ground loop hum somewhere in the system. Make certain that all of your phono cables are far away form electrical components with transformers.