Report "Amplifier overheating I have a trusted old nab 3020e amplifier which in the last few months has started overheating to the point it cuts off with a click. It is not a case of vents being covered up! I have it connected to tv and DVD inputs with single speaker output. Any ideas why this might be happening? I am not a technical expect but happy to open it up if it's a straightforward fix. Thanks. Kimberley"