I'm not sure what you mean by "grid hum," but it sounds like you have DC on the line. That could come from the utility itself or from within your house. Is this hum you can hear coming only from a component transformer, or do you also hear it through the speakers?
power grid issues?
Hi Agoners. By chance, are there any bright EE around who may have an answer to this? I get "grid hum" on my Balanced Audio Technology tube amp. It is irregular, happens for different intervals and different lengths of time. I have check my house system by shutting evert appliance of during these "hum intervals" and I do know it is not my house systems that are creating this noise, or fluctuation. I had PG&E check their system. They used a neutral detector and said that their neutral to the source is good. The power is stable. This morning the hum, which is audible in the transformer, was a wave. on off on off on off, for a good hour. then it stopped. Yesterday it was just a straight hum for a period of time. no fluctuations at all. What is going on?
Thanks for any input!
Greg
Thanks for any input!
Greg