[Hallicrafters] SX-100 ground issue

[Charles]

I recently purchased a SX-100 and was attaching a ground connection and got "zapped".  I measured the voltage potential between the chassis and my ground lead at 120 VAC; power cord is two prong. Would I help the floating ground situation by re-wiring the power cord to a three prong, or counld I have other issues; leaky cap, etc?  Any suggestions, insight would be appreciated. 

Charles Knight
Maitland, Fl.