Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca
John, what seems to be the problem? It might not be the detector at all and some other factor in your location that causes the thing to act up. At one location a State Police post interfiers with the Fisher's I try to use but leaves the Tesoro's alone. Also batteries can cause this and also a bad connection at the coil wire plug.
Be sure to tell us how it went with Minelab. They are usually very good with service.