Hum from SS AMp

I have a danville amp which when a Boss GT100 is plugged in creates a loud hum, but when a guitar is plugged strait in there is no hum, I have also tride send /recieve input

Using my Fender , there is no hum whatso ever

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@billybuoy what model is your Danville? Also, is it a Boss GT1000 vs a GT100? No issues with the Danville until you connect the Boss, correct?

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