How to accomodate a balanced only phono stage ?

Just a matter of changing the connectors and having it wired correct on the Balanced side. There is a great reference doc on Rane.com in the Notes area on wiring, I think RANE NOTE 110..It will show how to terminate correctly..

http://www.rane.com/note110.html

you don't have to do anything the turntable, it is naturally a balanced signal. Its a matter of physical connection. Some balanced phono preamps have xlr inputs instead of rca connectors which require either an adapter or a custom made interconnect, if that is what is needed/can be used, that has rca on the tt side and xlr on the phono pre side. I have used an Audioquest cable made that way and it worked great. Any TT setup can run into a balanced phono pre with the right connection.

Hope this doesn't go down too badly as my first post!
and I was just about to post about getting a new cartridge.

I don't think it is as simple as that.

The problem with running balanced from a cartridge is that the input electronics are doubled which creates 'electronic' noise and not 'common noise' which balancing cancels (CMRR). Common noise in a turntable cartridge system should be nothing significant if your system is setup correctly. Input stage noise though, due to doubling of stages/ components creates more problems than it can solve.

If you have noise or hum from your turntable it is better to look at 'why' than to try and irradicate it using balancing..... prevention is better than cure!

From what I can see, it is a marketing ploy by some phono stage manufacturers, and usually the not so serious ones, and seems to be the fashion for now... I have listen to it and am not at all convinced it is worth the effort and if anything looses some of the 'air' and speed that the single-ended RCA connection gives.