Well, the new AT Pro arrived yesterday. Thanks Bart. Checked all connections, tried both coils and all worked fine. Just fooling around I gave the front yard a little sweep and up came up newer nickel. I got the tone and thought, "naw". But, it kept ringing from different directions. Walked to the garage and got my digger. And up it came. My first find in less than 10 minutes! I used to own an X-70 that was just a coin, "magnet" I think the AT Pro will be it's twin brother. I didn't like how the covers fit so I rubber sprayed the bottom of both coils.