Increasing the sensitivity of my Garret Grand Master Hunter.

I found many cool things with it including a heavy gold ring, bracelets, earrings, and old silver and new coins, and of course lots junk, but never had a buddy into metal detecting knowledgeable or someone else to talk tips and techniques with. I live in Washington state and live an hrs drive away from a area where there are many old Gold Mines (Blewett Pass) (Peshastin Creek) (Liberty) I have bin out in the woods looking for gold with it Lots of times but never found a gold nugget. By my own testing i have found this detector is not very sensitive to small gold, It of course finds Larger Gold with no problem.  Can this detector be used to find small nuggets or is there anyone reading this that has found gold nuggets with a detector like mine and is there a way to tune it or equip it with a coil that is good for nugget hunting especially small ones because i suspect there are more small nuggets then big ones. I know there is gold in these hills because i have no trouble finding gold by panning the area creeks and rivers and also have found a small apparently never found before vain of gold containing quarts exiting solid rock on the side of a mountain in the Liberty area to be specific on Ruby Creek that made my heart flutter, however this was on an existing gold claim so i did not explore this further. Anyway i want to go hunt some more in that area but do not have the money to buy a newer detector. My question is can i somehow increase the gold detecting sensitivity of this old but good Garret Grand Master Hunter.

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Hello yes it is the 5.5 khz Detector it is the very first Grand Master Hunter Made, its got "all metal mode, pinpoint depth, disc, I just called garret and talked to one of the reps and he said this is the first model of grand master hunter ever sold by garret the model #is 11902 serial 2470-070. And on the side of the Detector it just says Garret Grand Master Hunter. Hope this Helps i need a day or so to send a pic if you still want one.

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