Is there anyone successfully repairing SONY BU-1B base units? X-4915-031-1.

Don

Where can I acquire a freq converter to go from 60 to 50 cps for mostly Seeburg jukes I'm shipping out of the US? Or maybe it's something I install at my end that converts 50 to 60 cps at their end? Tired of changing gears in these things. Just thinking out loud here. This is my first time here with...