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I want to put a big coil on my Tiger Shark

My shark has interchangeable coils. I was thinking of buying another (used) shark with a hardwired coil and swapping for a bigger, say 13 inch, coil. I was wondering if one of the aftermarket coils made for the Tesoro would work if I could hardwire it in. The lake I hunted hard last season has deep sand beach that I feel has targets too deep for my stock 10.5" coil to reach. There are also very few targets, so heavy trash is not present. Also, the sand there is so mild that it's impossible to actually ground balance the detector, it's balanced no matter where the balance knob is set, incredible but true. Any opinions, information, or observations please.


Hunt all metal listen for slight threshold rise.not necessarily a beep dig it all.I do not think you will gain much with a after-market coil,and even if you could get it to work .
you will lose most of your resale value. do not ruin your Tesoro


Well-known member
I just don’t know if you will gain much depth or not with the bigger coil..I have a tiger shark I’ve hunted with several times and generally speaking the depth was good but not great...after I worked over the water with the 10.5 in coil I put on the 6 in coil and was able to pull out a few deeper coins than I thought the 6” coil would get, but the place I hunt is littered with bobby-pins,hot rocks and what not so separation helped... if the sand you hunt is very clean I would hit it with the Excalibur... the tiger shark is a very good machine though..I did score a few very thin gold chains with mine ..