Possible that you have a EMI interferance in your circuit or power which carries into the set..Use the set in the battery mode and swtich off all the mains in your house. if this solves, then check on by one the connected appliances which might produce this static. You could also take the set to another location to see if this reduces off . in this case you will have to check if there is a lurking interferance from the power source. I suppose you might not get this faultt with the FM but MW and SW is bound to pick up the static unless the signal is powerful. Please also try to check your external cords, if possible change the location of the antennae. Further any fault on the radio IFT/filters could be considered. Hope my advice helps you . Good day