Hey guys. I just have a quick question. How do you check for a bad coil? I wondering if this in normal or maybe not. When I put my detector in AM mode, and gb it to quiet down, it hard to stop it from making noice when I sweep it. I can even run my hand accross the coil and and it gose off. I was just wondering if their is a way to crank it up and make it a bit more quite in all metal mode to get the most depth and sencitivity out of the machaine. And finaly What would be a good set up for my GB SE in AM mode to get the most sencetivity out of it.. Thanks just planing a trip out and want to know. 