Originally Posted by: dougjt

U can then run a ground wire from the little metal clip on the plug to any ground. (this is not necessary but in case ur building gets struck by lighting or something it will be safer)

That would be an EXTREMELY dangerous thing to do. In effect, what you're doing if you do this is bypassing the ground of your building's wiring, and wiring the frame part of your amp to ground. In a 3-prong configuration, the metal of your amp is GROUNDED. They way you describe doing it, it would become Ground with the positive and neutral floating without a ground.. So, if you were to touch any part of the electric positive and then and touch the metal of your amp, you'd be completing the circuit to ground and could electrocute yourself.