Pro Audio Asylum

But is the outlet grounded ?

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Having a 3 pin outlet is no guarantee that the third pin is actually connected to anything. Go to Rat Shack for a tester that will plug into an outlet and identify via LEDs any circuit faults. Then threaten to sue any club with deficient power supply.
The direct box could also be at fault. The better ones have a ground lift switch so that you can ground or de-ground the chassis. To be sure it's not AFU use a voltmeter to read AC voltage from the guitar strings to the mic body. There shouldn't be any.


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