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Old 17th Oct 2018, 12:06 pm   #14
McMurdo
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Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
Posts: 5,274
Default Re: Don't try this at home...

I've got one of those home radio repair books from the 1930's that advises you check the polarity of your DC mains by plugging a potato into the light socket and checking which prong turns it green
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