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RE: Why would reversing AC leads reduce hum in a component?

why would reversing the feed to the primary winding of the power transformer cause a safety issue?

In and of itself, it wouldn't but, if performed - as is often recommended - by reversing polarity at the mains input rather at than the transformer input, it very likely means (at least in the UK) that the fuse is in the neutral line, not the hot.

Hobbyists who don't understand why that might matter should either steer clear of the "tweak" or seek expert help. I suspect Parasound's feature addresses the issue perfectly safely but I'd hesitate to encourage users to try the idea on other designs unless they know what they're doing.

Though the benefits of competently configuring the polarity of transformer primaries to minimise leakage currents (aka transformer "sexing") have been known for decades, I'd wager that the cause of the OP's hum problem lies elsewhere.

HTH

D

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