This theory doesn't make any sense. Tesoro makes several coils for each detector, we expect any of the coils to work well. I share coils ( 8x9, 7" and 5.75" concentrics, 3x18 cleansweep, 8" widescan, 8" brown donut) between my Cortes and Golden. Never sent back anything for retuning and all coils work as expected on both detectors. The need to retune for one coil would most likely throw off the others, that would be a disaster. I say Tesoro would have added an extra knob for us to adjust if retuning was needed when changing coils.
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Many say to send a detector back to Tesoro for retuning when adding a new coil. Huh!
- Thread starter jabbo
- Start date
I've never had any problems changing coils on any of my Tesoros and I have been using them since they first came out. I think, unles you had a problem internally with the machine that would affect all coils, the difference between coils would be insignificant and make very little difference in actual field performance. A coil balance setup similar to Nautilus would be nice though.
If you own a MANUALLY ground balanced machine, you dont have to worry at all about coil balancing, as the GB process takes care of that. But if you own a FACTORY preset machine, such as Cibola, those coils are balanced to the machine at the factory. You can still put other coils on that Ciblola, and they will work, but they might not be tuned to the optimum setting and you could lose some depth. It also possible that other coils will already match your machine and you wont lose any depth, but to be SURE, you should send your factory preset machine in with all the coils you normally use, and Tesoro will tune it so the coils work at optimum performance. Do you have to send your machine in? No, but if you want to be sure its working at its best, its a good idea, and Tesoro doesnt charge anything for that service.
BarberBill
New member
As a general statement, you can change coils without much problem, but in some types of soil and/or on some machines adjusting for the different coil may be necessary for good or optimum performance. I've encountered a bit of chatter on my Deleon if I run the 10X12 coil, but it works well with the 8X9, 7" and 5.75". I haven't been concerned as to whether it's optimum with the extra coils as it gets good depth and runs stable with them as do my SSumax and Conquistador. My two bits.
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BarberBill
New member
That's an example where sending the detector and coil in could help, but then the other coil(s) might be a bit off.
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. but I think setting the ground balance to match your soil and tuning the coil to your detector is two different things. Steve.BarberBill
New member
It's my understanding that the tuning is equivalent to manual ground balancing.
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If you have a turn on and go detector without an external ground balance.... it's best to send it in to Tesoro since they'll have to crack open the control head and adjust the Ground balance pot internally. Best they do it to avoid Voiding the warranty. Yes, ground balancing/tuning a detector is one and the same ...
I still think that setting the ground balance and retuning the coil to the detector is two different things, the way I see it is a person can set the detector to match the ground either right on or a little negative or a little positive by adjusting the ground balance. But the techs can open up the coil and retune it by repairing or adding or subtracting wire wrap inside the coil. Tuning the electronics to the coil and viceversa is different than tuning the coil to the ground.
The coils, when made at the factory are all made with the same number of coil wraps ( Depending on the coil size of course) but after each coil has had the appropriate number of wraps added they then pour the cavity full of a weather proof epoxy to keep any debris & moisture out of it. You can see the epoxy when the scuff cover is removed from the coil...... after this epoxy has set up it's not possible to add any more wire wraps to the coil. If there's any problems with the coil it should be the wire connections on the plug connector on the end, the strain relief at the top of the coil or the wire's insulation cover ....(this is the only serviceable areas of a coil). Adding coil wraps isn't feasible after the epoxy has been added and has set up. The Ground balance pot is how they tune the coil to the detector, when this is done to where there is either no change in tone or it's slightly positive when pumping the coil.... the coil should be tuned properly to the unit. There's other adjustments inside the control box I'm sure.... but the ground balance pot is how to properly tune the coil to the unit you're using....... at least that's how I've understood the tuning process to go..... Tesoro will do the ground balancing or tuning for you though if it's needed. I've owned quite a few Tesoros but have never had to send one in for tuning or service. I know of some that have had to send their units in and gotten reports back saying that the internal Ground pot had to be adjusted because it was not properly balanced or had somehow gotten out of adjustment. That's why I have the feeling that ground balancing is the ticket to tuning a coil to a detector. How's the Silver doing for you Steve? Happy hunting buddy ! 
Hi Jay, I was having internet problems earlier today and my reply didn't get through - this was what I tried to postJay Evans said:The coils, when made at the factory are all made with the same number of coil wraps ( Depending on the coil size of course) but after each coil has had the appropriate number of wraps added they then pour the cavity full of a weather proof epoxy to keep any debris & moisture out of it. You can see the epoxy when the scuff cover is removed from the coil...... after this epoxy has set up it's not possible to add any more wire wraps to the coil. If there's any problems with the coil it should be the wire connections on the plug connector on the end, the strain relief at the top of the coil or the wire's insulation cover ....(this is the only serviceable areas of a coil). Adding coil wraps isn't feasible after the epoxy has been added and has set up. The Ground balance pot is how they tune the coil to the detector, when this is done to where there is either no change in tone or it's slightly positive when pumping the coil.... the coil should be tuned properly to the unit. There's other adjustments inside the control box I'm sure.... but the ground balance pot is how to properly tune the coil to the unit you're using....... at least that's how I've understood the tuning process to go..... Tesoro will do the ground balancing or tuning for you though if it's needed. I've owned quite a few Tesoros but have never had to send one in for tuning or service. I know of some that have had to send their units in and gotten reports back saying that the internal Ground pot had to be adjusted because it was not properly balanced or had somehow gotten out of adjustment. That's why I have the feeling that ground balancing is the ticket to tuning a coil to a detector. How's the Silver doing for you Steve? Happy hunting buddy !
Thanks for the explanation Jay, heck I must be almost a professional Tesoro tech. by now, at least a semi pro with all the adjusting of the internal g.b. pot. I have done over the years, lol. Most of them have been spot on for my ground, a few have been a bit too negative and needed a little tweaking. I am hoping (fingers crossed) to try out the Silver Sabre