I have a 10-watt marshall amp. It buzzes on clean and overdrive, with or w/o the guitar. When I turn up the gain or tone or volume, it gets worse. How do I fix this?
Yes you have the earth not connecting to the cab properly, have a look on google for a good local electrician, could be dangerous if you try fix it yourself
Mark, January 2008
it sounds like you have a bad earth,its best to take it to a dealer and have it serviced