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

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Well I tried an experiment

Posted by jedrider on February 11, 2017 at 23:43:01:
I got a cheater plug and snipped off the expansion tabs (easy to do but newer ones are wider the entire length, so that would be more difficult to snip) and tried reversing AC polarity.

I seem to get a 6-12 dB reduction in noise level. Just guessing, but I wonder how I would measure this with a scope??

So I listen to say Spanish guitar because it's usually on the quiet side and crank the volume louder than I normally listen and then remove the needle from the record and I can hear the hum. It seems lower when polarity is reversed AND the music sounds better. In fact, now it sounds better at the higher volume which is exactly where I want to be.

So I will open the unit up and reverse the primary leads. Note that the power supply is DIY and the primary leads look identical otherwise. I think I will tag the one that is suppose to be hot.