Hello Miner42:
I had a P3 that had the same problem. Rega's response was the same. When the LP is playing there is much less hum. I was using a Jolida JD-9 phone stage (tubes) and I found with an upgraded power cord (LAT International AC-2) the hum was much less. I also noticed that once I gave up on trying to get rid of it, it mostly went away. Perhaps one of those audio mysteries like cable break-in. Once everything settled in it was much better. I'm using a Rega RB1000 arm on an LP12 with a Graham Slee Reflex phone pre and it's dead quiet. Maybe the upgraded cables in the RB1000 make a difference or maybe it's the preamp.
Have a little patience and perhaps it will improve.
I had a P3 that had the same problem. Rega's response was the same. When the LP is playing there is much less hum. I was using a Jolida JD-9 phone stage (tubes) and I found with an upgraded power cord (LAT International AC-2) the hum was much less. I also noticed that once I gave up on trying to get rid of it, it mostly went away. Perhaps one of those audio mysteries like cable break-in. Once everything settled in it was much better. I'm using a Rega RB1000 arm on an LP12 with a Graham Slee Reflex phone pre and it's dead quiet. Maybe the upgraded cables in the RB1000 make a difference or maybe it's the preamp.
Have a little patience and perhaps it will improve.