The first mod which I wanted to carry out, is to add Speakon connectors for a better connection to my cab.
This is a very simple mod with the following circuit diagram:
To see the differences between this circuit and the original, see the the original circuit diagram in this post: Vanilla
By connecting the positive inputs to the speakon sockets to pin 2 of the jack sockets, the speakon sockets will only be connected if a plug isn't inserted into the jack socket. This helps to prevent the eventuality of a speaker being plugged into both the jack and speakon socket being connected at the same time which could lead to an accidental impedance mismatch.
Update 25/11/2009:
Highlighted the changes in Red to make them more obvious.
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