If it hums when running on battery power, either your cable from your instrument needs repair, or it's the wrong type (unshielded or TRS) or your instrument has a problem, or you're in an area that has too much RF or electromagnetic interference.
Testimonial: "It turns out, it was a brand new L.R. Baggs pickup (the type built into the bridge) that was causing the problem. I had to return it. Fortunately, my old one, which just sticks on (a McIntyre) still works fine."
SOURCE: my roland cube 20xl has an excruciation hum when
something could possibly be giving it feetback or it could be Faulty i would check with the store you bought it from
Testimonial: "thanks i will check with the store"
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What I discovered was that it was in fact, a brand new L.R. Baggs pickup (the type built into the bridge) that was causing the problem. The guy I got it from tried everything, but couldn't make the problem go away. Fortunately, I still had my old one, a McIntyre pickup, which just sticks on.
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