G-Major / G-Major 2 / G-System: Channel switching cable for Fender Pro Tube

Question

How do I assemble a cable to make the G-MajorĀ“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.

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