Yes, John Risch had an excellent DIY project on his website for a nice balanced power transformer "conditioner" using a Signal DU-2 power transformer. It can be wired in a number of different ways depending on your power/amperage needs, and can even be used to step-up and step down the voltage coming out of it. I am using one with great sucess in my system in the balanced output mode. I can fill you in on the details if needed, and they are quite affordable.
