Lyra Lydian Beta, Rega hum?

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?

This rig is all new. Bought the cartridge from overseas seller. Last night I shut my amp off and listened with headphones through my Sonic Frontiers line 2SE headphone jack. There is a hum in stereo, but when I switch to mono the hum is at such a low level it is not a problem. Why would it hum in stereo and not in mono? When I use mono through amp and speakers hum is lower than stereo, but not really tolerable.

Problem solved! Had a repair guy check it out and he found the pins on the cartridge were labeld wrong! Never would have found it myself.

WOW!! Who woulda thunk it?!? Thanks for the update- I was wondering how this would turn out...

Regards
Jim