... I once got a nice jolt from my guitar amp,a vintage, 2-pronged plug, tube style Ampeg,and the microphone,which was plugged into a different amp(also a 2-pronged plug),and the polarity was reversed... the case,carried current and when my lips touched it....yyyouch!! the circuit was complete,..from the guitar strings,thru my body to the microphone.. Stung like a witch,.. [Linked Image] [Linked Image]
Russ

.."if it ain't fixed,don't break it...call a Licensed Electrician"