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Yup. It humms . It's real annoying . The previous owner modified it slightly: he ran the speakers to guitar cables and installed female jacks on the back of the amp for them to plug to; so that you could use the amp as a head for a cab. I wonder if he didn't use the right cables ( read somewhere you gotta use unshielded cable for this type of mod) or is this is just supposed to do this. Don't know. Help, please.