Wow! Many responded but forgot to address the real issue.... The Rega uses a grounding scheme where in only one ground (not the right term, it should be negative phase) is common between + of both L&R signal. If your phono preamp is not configured the same, it may result to a hum.
What to do? Try to connect the negative phase of the L & R signal input at the phono preamp together or disconnect one of the ground from the input IC's. Also, try to ground the body of the arm to the phono preamp ground.
Assuming that the one you are having is really a ground loop problem and not anything else of course. The posters above mentioned isolating the position of the table and the phono preamp from the rest of the equipment. That is a good suggestion in order to find out if youare picking up RFI or really have a ground issue.
I do not know a lot but I experienced the same thing using my Origin Live Silver and rega 300 arm before.
Goodluck!
What to do? Try to connect the negative phase of the L & R signal input at the phono preamp together or disconnect one of the ground from the input IC's. Also, try to ground the body of the arm to the phono preamp ground.
Assuming that the one you are having is really a ground loop problem and not anything else of course. The posters above mentioned isolating the position of the table and the phono preamp from the rest of the equipment. That is a good suggestion in order to find out if youare picking up RFI or really have a ground issue.
I do not know a lot but I experienced the same thing using my Origin Live Silver and rega 300 arm before.
Goodluck!