From time to time on some of the DIY Audio forums, people write about DC on their AC power line causing the power transformers in their units to buzz or even saturate! In a residential neighborhood how does DC get on the AC power line? I could understand 3rd harmonic distortion from SMPS's being read as DC on a multi-meter, but where would enough DC to saturate a power transformer come from?
Kevin (remove the Zeppelin to reply)