Or there's a loose connection. The BC21 is wired point-to-point and some of the components are supported by the wiring. I had a similar problem with a BC 21 which deteriorated into more noise. Cured with one dab of soldering iron. Open it up and look for something loose, probably connected to volume control.
have a knowledgable tech spray the volume pot for you with an oil-free cleaning solvent (& then work the control end-to-end several times before the spray dries - tech should know to do this). If the symptoms continue then move on.
*IF* the buzzing isn't present when you're not touching the unit, *AND* it's fairly low in level when you are, I wouldn't worry about it too much, as it's probably just one of those little grounding anomolies having as much to do with the AC line and the combined other gear in the system as the component itself.
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