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115 vac, the "nuetral" or long terminal in a modern 3 hole socket, is connected to ground. "hot", is the smaller staright slot. if hot and nuetral are reversed, you get noise. a light bulb or an toaster will work fine but audio gear
hums....buy a $5-8 outlet tester at the hardware store and routinely verify the safety and polarity of your gig or jam outlets. testers are easy to use and can identify open ground and hot/nuetral reversed situations.
if you use an old two-wire vintage amp, find out which wire is switched on the amp, this is the hot side, mark your wall plug hot side and make sure you plug in the smaller slot on tested good wall sockets.
i have seen the flash of lightning from my lips to the microphone and felt my arms go wiered playing vintage amps.
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