If it is a low frequency hum, it is most probably a ground loop somewhere, unless the problem is within the unit itself. I suppose you have to get a cheater plug and experiment with the powercords, taking care not getting electrocuted. See to it, that all your units are plugged into the same wall receptacle and experiment with a grounding wire between your OM 150 and your preamp. If all that doesn't change anything, try another pair of interconnects. (Sounds crazy, but for me that helped once)
Audio Alchemy OM 150 hum. What is the cause?
I recently purchased an AA OM 150 at a really attractive price. The former owner disclosed that the piece had a hum coming equally from both channels. I hooked up the amp and sure enough it has a pretty hefty hum from both channels. When I disconnect the interconnects the hum in both channels disappears. Connect either one alone and there is no hum. What gives?
5 responses Add your response