Re: My first valve radio project - Philips 462A
By convention, the lead that goes to the power switch should be mains live. If the switch is double-pole, it does not matter so much. You might find you get less power hum with the neutral to the outermost end of the transformer primary winding. But, it's alternating current; and everything is insulated anyway.
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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