Could it be a defective cartridge or lead? All the cartridges I have tried in my Linn setup (except EARLY Grados) have been dead quiet with standard connections and grounding. FWIW - what does your dealer say?
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I used a Aurum Beta on my brand new VPI MkIV (Rega 250 w/ Incognito wiring) with the same results. It didn't hum at first (well not that much) but within a day it was really humming. I tried everything under the sun to fix it. Finally, I tried a Shure V15 and bingo, everything was great. I, to this day, do not know what the problem was. I put the AB back in and the hum was back. This time in one channel. I really think it had something to do with the body of the cartridge. All I know is I spent a chunk of change to get back into vinyl and this about sent me the other way quick!
I just had a Wood Virtuouso installed on my lp/12 Ekos . Absolutely dead quiet. Unfortunately I have no idea what the cause is except to say it is not an inherent issue with the cartridge design or your application. Just curious...the 10 gram weight of the Aurum betas seemed to be out of the range of the Linn arms. Do you have to move the counter weight far back?
Thanks for all your responses. The dealer told me to put a three prong to two prong adapter on the lp12 AC cord. I did that plus removed the ground wire from the LP12 to the pre-amp and that greatly reduced the hum in the right channel but did not eliminate it. Linn Help line indicates that the table should be grounded so I am not going to leave it like this.
I did switch the leads around at the cartridge and when I switched the left and right the Hum went to the left side so the problem is definitely with the cartridge and not the LP12 leads.
I have another call into the dealer. I think I am going to push to get this returned. Thanks again for the comments, I was getting ready to give up vinyl all together.
I had a little hum on mine until I put the little plastic stick on film ''shim''on the cartridge and used the plastic screws that were included in the package. I'm using the RB300 Quint wired arm and a Gram Amp 2 SE. It is very quiet now. Grounding the TT did not help me. I seem to remember a thread from a while back that talked about one of the channel grounds on the Aurum Beta, which made me think, isolate it and only ground it at the amp end.