bigticket said:There were actually better detectors back then than that White's with the vacuum tubes.? How much does a 67 1/2 volt battery cost you?
This is an interesting point. Originally, almost all metal detectors were made for finding large objects (one author wrote about a certain detector being suitable for finding smaller objects - like plastered over conduit boxes). Does anyone know when detectors were first designed for finding small objects, like coins?D.H. said:They didn't believe any machine could find small single coins buried.