The xr2206 can only handle +/-13Vdc rail to rail. Pretty much all ICs I have like LM723, opamps, etc can't use this transformer either, without lowering the voltage 1st.
I'll look into making a linear PSU with big power transistors, I have lots of 2N3055 and heat sinks. I bet I'll need power resistors tho, and big current sense resistors.