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Why?
Buy one of the MTH controllers that go with their bricks, you can put that in front of most any PW transformer.
Plug your transformer into the output of a ceiling fan control or incandescent dimmer, set the throttle at full, and adjust the output with the fan/dimmer control.
Have you tried this Rob? I'd think the 110V control would probably not be ideal at the lower voltage. Curious how well this would work.
I have done this lots of times. The dimmer is used on the primary(120v) side, not the secondary.
I think the transformer would deform the wave significantly in the secondary. One of the reasons that you might want to try this experiment is to see how electronics reacts to the sawtooth wave. The transformer will round it to a distorted sine wave, it won't have the edges that it would coming directly from an electronic controller.
Add a Powermaster or TPC
Or run it thru a DCS TIU Variable channel, that chops the wave to reduce voltage too.