Jake:
If you are getting shocked by your amp, you must be completing a circuit to ground. What are you standing on when this happens? Does it happen under different circumstances or more often in one location or another? Does changing the power switch polarity make any difference?
It may be fixable with a three wire power cable, or it may need serious repairs, like a transformer replacement. Whatever, please have it checked out by a qualified tech, before it gets worse and does serious bodily harm.
Bill