An Astron RS-50A unit I repaired that came from a set of 3 that was used to power a church organ. I have added a Ametherm MS32-10015 to reduce inrush current draw when first powered on (I kept annoyingly tripping the breaker when the A/C cycle was just right and I powered on my Astron). I used the excellent article from Repeater Builder by WA1MIK as a reference and then contacted Ametherm which provided me with the proper part number. The email is referenced in the Repeater Builder article.