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F75 Coil Question

david bull

Well-known member
Way too many variations in soil conditions to accurately determine coil depth ability. I have pretty near every coil made for the F-75 and prefer the CORS Tornado for open field relic hunts and the Fisher 5” concentric for yards,parks and other trashy areas..


Well-known member
Is there a coil for the F75 that's smaller than stock with equal or more depth?
F-75 or most any other detector, no difference when it comes to coil performance. Some. Possibly, but it gets down to a coils geometry, the strength of the EMF field, and the size of the anticipated target you are searching for.

You will hit a point where coil size starts to loose performance on smaller-size targets like coins and rings. Start getting bigger than that point and target-depth decreases. Naturally, ground mineral make-up and the particular detector settings used will come into play.

Personally, I very seldom use a coil that is 'standard' size for quite a few years and have favored a mid-size coil to get 'practical' or 'functionality depth. Some examples:

Round 8" Concentrics on most White's offerings since about 1990. Elliptical DD's on most other brands such as a 5X8, 5X9.5 to 5X10, 6X11, and 7X10. In most applications these coils were better balanced and worked in and around most environments that the 'satndard' size coils most folks consider. And I also seemed to get a bit better and tighter VDI responses and lock-ons.

My reply is how coil selections have worked for me when searching for smaller-size targets like coins, trade tokens, jewelry, and smaller-size artifacts such as buttons, thimbles and such.



Well-known member


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Mike Hillis

Well-known member
Jim always said the 5" DD got pretty close to the same depth as the stock coil in his dirt.