Shocking Experience in James Tyler Variax Guitars / Workbench HD Posted April 4, 2017 You don't say what kind of amp you're using. Step 1 is to make sure that your own gear is safe -- no cut-off ground pins or ground-lift adapters, no bad wiring mods, etc. Assuming that your gear is not trying to kill you -- next time you play that venue, take a polarity tester. They're about $5-6 at Home Depot or Lowes, and you should have one in your gig bag anyway. Test the outlets where the mixer your gear were plugged in. You'll probably find that one of the outlets has the hot and neutral wires reversed. I've seen this a lot, even when the work was done by professional electricians. If that's the case, tell the venue so they can get it fixed. In the meantime, take a foam windscreen and put it over your mic so you don't get zapped again. If your gear and both outlets are wired correctly, then it's possible that one or both of the outlets is not properly grounded, or that they are on different grounds. The club should be willing to have this checked out by an electrician; it's a serious safety hazard, and you can't be the first performer who has had this problem.