I need to replace the output transformers of a Fisher X100. Fisher part numbers are T1109-114-1 for left and T1109-114-2 for right. How or why are left and right different? Long ago, I thought the Hammond 1650E was most appropriate but I wasn't sure and didn't order it. It is no longer available. Which Hammond transformer part number did you use and how did you know to pick that one? Would replacing be better than rewinding?