I just got the latest Hifi News magazine and, as usual, the same ridiculously expensive mains cables etc are being pimped. I usually just skim over that crap, after admiring how pretty it is, but this ...

Electricity is supposed to be the “silent servant”. So why do transformers hum? • Transformer hum is caused by a phenomenon known as magnetostriction. To understand why, it is necessary to take a look ...