Photo 1 of previous customer states: Unit hums when guitar plugged in indicating a bad ground circuit.*** Positive Grid Spark Guitar Amplifier and Traveler Bag Bundle

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Photo 1 of previous customer states: Unit hums when guitar plugged in indicating a bad ground circuit.*** Positive Grid Spark Guitar Amplifier and Traveler Bag Bundle Photo 2 of previous customer states: Unit hums when guitar plugged in indicating a bad ground circuit.*** Positive Grid Spark Guitar Amplifier and Traveler Bag Bundle Photo 3 of previous customer states: Unit hums when guitar plugged in indicating a bad ground circuit.*** Positive Grid Spark Guitar Amplifier and Traveler Bag Bundle Photo 4 of previous customer states: Unit hums when guitar plugged in indicating a bad ground circuit.*** Positive Grid Spark Guitar Amplifier and Traveler Bag Bundle Photo 5 of previous customer states: Unit hums when guitar plugged in indicating a bad ground circuit.*** Positive Grid Spark Guitar Amplifier and Traveler Bag Bundle Photo 6 of previous customer states: Unit hums when guitar plugged in indicating a bad ground circuit.*** Positive Grid Spark Guitar Amplifier and Traveler Bag Bundle