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Question How do I assemble a cable to make the G-Major´s relay switching work for my Fender Pro Tube Series Amp (Pro Tube Twin Amp / Pro Tube Concert Reverb / Pro Tube Pro Reverb)

Answer
Please assemble an interface box/cable according to the attached schematic.The components are available from most electronic parts suppliers. Please note that this interface is different from the one for the older Fender Twin.