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Help:Annoying Amp Buzz

I have a MIM fender jazz bass (fretless) and an Ibanez SW65.

When the amp is on without the plugged bass it's o.k.

When the bass is plugged with the tone (on the bass) butten turned to the highest it makes an electrical buzzing sound in the amp.
When I turn the tone completely down the buzzing stops.
The pickup volume buttens do not affect the buzzing no matter whether they are on or off.

When I opend it I didn't see any loose cables, but I'm not an expert.

Anyone has an Idea how to solve this buzzing?

Thanks,
Daco