Lyra Lydian Beta, Rega hum?

Can't help wondering if the hum is due to an open coil in the cartridge. Is the hum so loud that you can't listen to music and does it begin the second you engage the phono circuit? If so, it may be an open coil problem. This happens from time to time with less expensive cartridges as quality control is usually less then with the ultra expensive cartridges. I had this problem with a blue point special and grounded everything in sight(boy, the dog sure hated that wire around his neck) until I gave up and had the cartridge tested, found defective and replaced with end of problem. Sounds like it's time to take the cartrige back to the dealer or if no dealer, Immedia and let them check it out.

Yes Franks, The hum is too loud to listen to and it starts as soon as take phono preamp off mute. Guess I need to get it checked out.

Before you give up hope - try a few different carts - if you can. If they all hum about the same then you've a problem with the p25/600.
I personally couldn't tolerate the P25/600 with its earthing/motor shielding quirks and changed to another brand of t't; and haven't been happier.

Still think it's the cartridge, but one other possibility has occured to me. Is the cable from the phono stage to your line stage shielded? If not, this can be a considerable source of hum. Let us know how this turns out.

David, i've never told that the hum is from the table. There shouldn't be any grounding problems with RB300 either except when there are some manufacturing deffects.

The first party to call should be Immedia to report a problem with the cartridge.

BTW do you connect this setup the first time or you used different cartridges prior?