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 ...

I was having a periodic hum in the torroid transformer in my nad power amp. I did some researching that pointed to DC in the power line causing the hum. I found that the DC was being caused by the ...