This may be discussed elsewhere, but couldn't find it, so I'm posting this anyway.
I have a Beogram 3300, the wedge shaped turntable, connected to a Beosound 9000. There was always enough level difference it was annoying, plus having to use an old integrated amp for its phono preamp. Anyway, I got one of these:
http://www.phonopreamps.com/TC-770LCpp.html
This unit has a DIN connector on the back, so that you don't have to use an adaptor to go to RCA and ground wire. It also has a variable gain, I was easily able to up the gain on the table so it matched the Beosound CD and radio with just a touch of gain.
So far I'm very happy with the sound, and the fact the levels are matched. I can recommend this as a good phono preamp for B&O tables. When I contacted the dealer, he directed me towards this when he heard I had a Beogram, for the reasons mentioned, DIN connector and the low gain of the B&O cartridges.
Good product, seems solidly made, and solves a number of problems.