Someone has finally made an affordable power supply that I'd like to try. Its much less than the Walker or the VPI model at < $300
http://www.phoenix-engr.com/#!/The unit will only work with AC motors using no more than 5 or fewer Watts, however.
It's very frustrating trying to get specs on my older WT square motor table being that it's no longer in production and WT isn't much help either.
Does anyone know or is there a way to determine if those square motors are <5W