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Old 11-21-2017, 08:02 AM
MBDiagMan MBDiagMan is offline
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Join Date: Nov 2017
Location: NE Texas
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I have a bad habit of quickly perusing posts before responding. Sorry for posting before seeing that you had already done that.

Since you get the same result with multiple instruments and amps, it pretty much has to be a magnetic field in the house or a wiring problem that the ground tester is not identifying. Do you know if it is 60 cycle hum? Are you near a high voltage high wire? Have you turned off every breaker in the house except the one feeding power to your equipment?
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