G-Major / G-Major 2 / G-System: Channel switching cable schematic for Fender Twin Amp

Question

How do I assemble a cable to make the G-Major / G-Major 2 / G-System's relay switching work for my Fender Twin Amp?

Answer

Please assemble a cable according to the drawing below. The components are available from most electronic parts suppliers.

Please note that this interface is different from the one for the Pro Tube Twin Amp.

A skilled technician will be able to fit the components inside the housing of the jack connectors (We can recommend Neutrik NP2C(mono) and NP3C(stereo) jack connectors as they offer space for the components and superior strain relief).

 

Relay 1 open and Relay 2 open = distorted ON
Relay 1 open and Relay 2 closed = crunch ON

Relay 1 closed and Relay 2 closed = clean sound
Relay 1 closed and Relay 2 open = clean sound

With thanks to Mr. Yves Martini


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