Since the OP was looking in the used category for a product, I would cast my vote for BPT . Not only does it use the transformer type that he requested, it also renders a balanced output . In addition, my model has separate shielding for each secondary winding . The end result is the best isolation for each outlet connected to its own secondary . BPT had many options for upgrades as well, but the model that I own (I believe that it is a BPT 13.5? sorry, too many years ago, and the back is impossible to read given its physical location . The damned thing weighs in at 80 lbs.) I remember that it will support a total of 10 amps total, but EACH winding is rated at 10 Amps as well . I know, everybody wants to say that their product is 'built like a tank', but weight alone is not the justifier here . Truly, from the chassis to the individual components chosen, the BPT brad is like few other products that I have ever owned in terms of quality performance and heavy duty plus build .