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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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

Back in the 60's before AC plugs had polarizing plugs if a component produced hum the fix was to reverse the plug in the duplex outlet. This was very common for separate amplifiers and pre-amps. Reversing the plug of one of the components would eliminate hum. I don't know why but that's what you did and it worked.


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