Don Foreman wrote:

It's a good bet. The thermal time constant of most FHP induction
motors is probably something like 10 to 20 minutes. Producing a bit
more heat at 50 Hz for a couple of minutes, followed by a "rest" of
that long or longer, won't raise the motor temp enough to be an
issue.

Thanks Don! I've learned that my shop stereo should work fine with just
a transformer, so looks like I'm almost completely set on the power issue!

Jon