Sometimes it can happen that you plug your speaker cable into the input of your cabinet and no sound comes out of the cab despite a correct connection and a working cable.

It is possible that a cable inside the cabinet - or the speaker itself - is defective, or there is a cold solder joint or a cable lug that has not been properly attached. In all of these cases, the cabinet must be opened, and this is something that should only be done by trained specialists.

However, it could also be that the input jack (or one of the output jacks) is slightly corroded. In this case, you can remedy the situation by inserting the jack plug of your speaker cable into all sockets and pulling it out again several times. This will allow you to clean up the corrosion and get the bushings working properly again.