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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

RE: Torroidal transformer hum and DC Blocker DIY

Can this DC current be from a ground loop voltage or something separate? I've been breaking the loop by physically disconnecting the CAT when using the rest of the system but I did notice a slight vibration in my Outlaws when the ground loop was broken. How do I diagnose if there is DC contamination? What DC filters are available commercially? Not sure I want to DIY something on the AC lines. BillF


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