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Philbo

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  1. 10 volts difference pumping into the transformer is next to negligible. Fuses shouldn't blow just because of a "normal" voltage spike. More often they blow due to internal shorts or massive spikes due to a line fault (vehicle hitting pole/mains transformer faulting etc). Either 220v or 240v would work equally well in my opinion. It's important to inspect power supply capacitors that are on the supply side of the board. They die and some die hard. When rejuvenating old radios or audio equipment virtually all caps are replaced; some need binning and the others, just because 😉
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