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.
How to accomodate a balanced only phono stage ?
I've got my eye on an expensive Phono stage that only accepts balanced inputs - from my experience about 99.9% of the tables out there are single ended only. Is there a cost effective way to convert an single ended turntable to supply a balanced input of a phono stage (without compromising the signal)? thanks for any input.