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Mike,


I have the fluke.


For all,


My question is really more about what is the dc return path in a switch mode power supply.


None of the explanations that treat the mic body and ground as the return path (assuming the guitar rig was the source of the potential difference) explains why the effect comes and goes with the global phantom power and was present even when the singer was not touching the guitar.


The shock was also more like a discharge then a continuous flow.