So I got a new Rega in part to upgrade my tt, in part to get away from the hum that my P1 was causing.
At first I had issues with a buzzing that was solved by grounding the Seduction to the Power supply unit that is separate from the Rega.
But there was still hum. I understand that this is in some respect inevitable, especially when you turn the volume way up.
But last night I reinstalled the C4S boards (thanks, Eileen, for the replacements), and now the hum is much louder.
I'm starting to get impatient and really disappointed. I'm assuming this is a problem with the Rega, since my old Technics doesn't display the problem. I guess it could be the cartridge, but I doubt it, since the hum was present with the stock cart, too.
The hum is audible with phones at about 30 on the volume, getting louder as I turn it up. I have a ground loop isolator that I will add between the table and the Seduction once I get a coupler in the mail (the ground loop is male/male). Other than that I can't think of what else to do, except maybe return the table for a different brand. From what I can tell, this isn't a Rega problem, but with two in a row like this I'm skeptical.
I might try mounting the cart to my Technics to see if it's the cart...