You can wire your transformer (all transformers are inherently balanced) with RCA jacks. Just make sure that they are insulated from the chassis. My arm is wired balanced with RCAs because the arm is hard wired and XLRs will not fit through the mounting hole. I wouldn't want to unsolder jacks every time that I needed to pull the arm. Besides my phono pre has RCA inputs, switchable between balanced and grounded. It's not the jacks that make something balanced or not, it's how they are wired.