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It mattered if you were repairing them, 60 years ago!
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Discuss Polarity on this led driver in the UK Electrical Forum area at ElectriciansForums.net
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they would be hard wired the right way round back then.... not a detachable cable that could be turned
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Not necessarily. People who repaired valve radios will attest to that.
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You think so? Reversible two pin plugs and line sockets were common.
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