I once talked to someone, Paul I think, from PS Audio about plugging in their regenerators into step down transformers. He said no problem but try to go with the transformer rated 1.5 times, that's if say, you have 1500 watt rated regenerator it should be 2250 watt transformer. However, this particular transformer company says it is not necessary, so I would assume that 2000 watt transformer would be more than enough for 1500 regenerator.
Don't know about Runnung Springs, maybe different.
Don't know about Runnung Springs, maybe different.