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Weird Noise from amp

So today while in practice my BA-108 amp started making a weird noise like a rattling when i played the A on the 12th fret of the A string, and only that note. Im pretty sure its just a loose screw on one of the metal corners...any other input or does that seem right?
 
Since it's an all-transistor combo, I would start with the screwdriver treatment. Then, if that would not solve the problem, I would take a flashlight and look carefully at the speaker cone. If the speaker is OK, I would take the whole thing apart and see if anything internal is loose. Hot glue helps tighten large components sometmes (use common sense with the glue gun).
 

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