I once had a problem with hum. It was caused by Halogen lite bulbs. I asked a few of my knowlegable friends how to get rid of the hum but nothing worked.Since it only buzzed when the lites were on, I thought why not go to regular bulbs. Presto, no more hum. My friends were impressed.
Do you have any halogens in the room or nearby?
Do you have any halogens in the room or nearby?