Some time ago I received a prototype version of one of my favorite detectors, the Fisher F75. I had an old story that needed telling and combined that with a mini-review of the prototype at http://www.detectorprospector.com/forum/topic/357-fisher-f75-strikes-gold-twice-in-a-row/   The new version offered more resistance to electrical interference, a new Fast mode for working trashy locations, and some additional audio options, also intended to help in places where ferrous trash is abundant. Fi