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RE: " Maybe I should be looking for a toroidal transformer"

Posted by Tom Bavis on June 18, 2017 at 19:31:29:
I have a few of those Hammonds (single primary version) and the secondary has a higher resistance than the primary, about 10%. I would guess that they're designed with about 10% step-up (about 132V unloaded) to give 120V output at the rated 0.25A load. In reverse, the voltage would be 10% low unloaded, dropping another 10% at full load. These could be used in the usual direction with a voltage doubler - that's how I expect to use them.

I used a 1:1 toroid to power a small amp (w/ voltage doubler), and wound an additional 6V secondary on it for heaters.