Tesoro Silver uMax Review #1

Ray in CA

Hero Member
Oct 11, 2007
983
16
Quincy, CA
Detector(s) used
Minelab Safari with SEF 8x6; coming soon: FORS Gold+
Hi folks,

Well it's been almost a week since I received my new Silver uMax and just wanted to give you my first impressions.

First of all, I want to say that I've completely forgotten just how much of a pleasure it is to swing a Tesoro! I've used many detectors but Tesoro uMax's are just wonderful to hold in your hands. One can swing it for long periods of time with the stock coil and not get tired. Put the 12x10 coil on there, however, and you do begin to feel just a tad weighted down after about an hour of hunting. But then again I'm a small guy so swinging anything with a large coil for an extended time will eventually be felt by me. But even so, the larger coil isn't all that heavy when compared to other brands.

My first look at the controls sent me reeling back to the days when I used a Bandido II uMax, but in this case I was dealing with far fewer knobs and toggles. On the left there's the discrimination knob, on the right is the sensitivity. In between is the mode switch–battery check to the left, discrimination in the middle, and all metal to the right. Simple! In addition to this, the built-in mineral rejection left me free from worrying about having to ground balance. Just turn on and go. This is a very appealing feature even for a seasoned metal detectorist like myself. It should be even more so for those who are just starting out.

Day 1

My first experiment led me out to my own front yard. My house was built in '59, so I figured there just might be a silver rosie out there somewhere, perhaps even a '64 quarter. What I wanted was silver. After all, I did get a Silver uMax! So, I set the disc to 1¢ZN and the Sensitivity to 8 and had at it. Within the first ten minutes of use I landed a nice little .925 silver ring (some of you may have already seen my posting of this). Talk about getting the blood pumping! I quit right after that because I had other things to do that day, but one thing I did notice is that even with my disc set to 1¢ZN I was still picking up a few memorial pennies here and there. It seems one has to go a little ways past this to mask them all out without knocking out silver. By the way, I was using the stock coil when I found the ring, and it was buried approximately 4" in my lawn.

Day Two

I decided to hit my next door neighbor's vacant house, for which I've already gained permission to hunt when I had my MXT. The house was built in 1929 so I was certain there were some older silver coins on the property. I kept the stock coil on, kept the disc setting the same, and proceeded to first hit the areas between the sidewalk and curbs, then the side yard, then the back yard, and finally the front yard. I did a pretty thorough search but only came up with a bunch of clad (again, including many memorial pennies), a couple sprinkler heads, and a few odd pieces of metal, but no silver. I was somewhat disappointed, but knew I still had a chance with the larger coil I had yet to use. Finishing my search, I gave the clad away to a little 8 year old girl we know from down the street, who had been watching me metal detect the whole time (three days later she still had all that clad in her pockets! LOL).

Day Three

I returned to the house next door, but this time with my Spider coil on and same disc settings. I was determined to nail a piece of silver. I covered all the previous places I had detected a few days earlier but with the same results. No silver!! I did, however, get more clad and a tin can down about 10". Not too exciting. I couldn't believe this house wasn't giving up any silver! But that's how it goes sometime TH'ing. So, my next plan of attack is to drop the disc down to less than 5¢ and see if I can at least pick up a buffalo nickel or, perchance, a gold ring. Once I finish with that, I'll drop the disc down to iron and dig all targets to see what I can come up with.

Day Four

It's back to my front yard again, this time with the Spider coil on. Didn't get any silver but I did manage to snag a 1966 Canadian penny and what looks like a Chinese coin with a 1 on the backside. Can't read Chinese so I don't know what denomination or year it really is. Will try to post it in the What Is It forum for ID. I also found an old toy car that was only about 1 1/2 inches long and missing a wheel. All finds were about 5 inches down.

To sum up my first few experiences with the Silver I would have to say that I am pleasantly surprised by its performance. I do have to fiddle with the disc knob a bit more to find out just where different metal targets actually do mask out but in time I'll get it down. I didn't seen any real advantage in setting the Sensitivity past 8, as that seemed to do the job while keeping the detector running smoothly. Pinpointing with the stock coil is fairly easy and accurate; however, the Spider coil will take a bit more practice. On one target I actually ended up digging an 11" hole only to find that the target was 1 1/2" south of my hole and only about 3" deep. I am taking my pinpointer along with me now to help when using the 12x10.

One other note about the 12x10–on day four I did an air test with a silver rosie, and found that with the coil going over the flat side I could only get about 6" max. I then put it in a hole at around that depth and pushed some dirt on top of it to simulate a buried coin, and the spider coil did not even let out a whisper. I'm wondering if anyone else has had a similar experience because I was told that using this coil on the Silver uMax would give me great depth on silver coins. I don't consider 6" great depth, as that is what I was digging silver coins with my B2uMax and a 7" dd coil.

Despite this, I still think my first few times out with the Silver uMax was very encouraging and I expect my finds to increase as I assimilate myself back to using Tesoro detectors.

Stay tuned for another review in a couple of weeks as I diversify my hunting.

Ray
 

A couple of things. All Metal should give you more depth. The sens. might be a little high if the soil is a bit more mineralized. It could help mask the signal. Try playing around in both disc. and All Metal as well as adjusting the sens. Another thing is--I'd wager that the mems you're picking up are dated before 1982. The 1cZN will knock out the newer mem made beyond 1982. In '82 they made them in both copper and the zinc composite.
Just a couple of thoughts. Good Luck and HH!
 

My understanding is that the larger, 12X10 concentric, coil tends to start losing smaller items and is really for finding larger targets deeper. I got one for my Eldorado and I intend to relic hunt with it for deep plates, large iron, firearms, etc. I have to test it to see if will pick up the mass of a bullet at 10".
 

I was surprised to read some of your comments. I had no problem at all pinpointing a target with my 12x10. Sometime watch my YouTube video.

As for digging a hole and dropping a coin into it and covering it, I've never had a detector yet that did any good on that sort of test. My Sovereign GT would get about 5 inches on a quarter when I tried that. My Nautilus IIB got about 4 1/2 inches. But both would get double those depths in a real dig situation. Fresh buried is even worse than air testings when it comes to discovering a detector's true depth.

One thing that is a little better is to glue a coin on a wooden dowel, make a hole in the ground to the desired depth, then put the end with the coin down into the hole. For a 6-inch test use a 6-inch dowel, etc. This is not duplicating long time buried but it comes much closer than simply digging a hole.

If your Silver with that 12x10 doesn't find coin sized targets at 10 inches then something is wrong with the detector or coil (maybe both). Or you have very bad soil there.

Nice Review and hope things improve in the future.

Badger
 

"Fresh buried is even worse than air testings when it comes to discovering a detector's true depth."

I too, have proven this fact to myself. Has anyone ever come up with an explanation for why this is so? What is it about the voids introduced when soil is removed and then redeposited that throws off the EMF or scatters it, so that the detector cannot get as good a read as it can in compacted soil?
 

BamaBill said:
"Fresh buried is even worse than air testings when it comes to discovering a detector's true depth."

I too, have proven this fact to myself. Has anyone ever come up with an explanation for why this is so? What is it about the voids introduced when soil is removed and then redeposited that throws off the EMF or scatters it, so that the detector cannot get as good a read as it can in compacted soil?

BamaBill I've asked that question myself many times and never yet got an answer. Nobody even ventured a guess.

I personally have never bought into the so-called "halo" thing when it comes to non-ferrous metals. I think it has to do with soil conditions. Long time settled soil is much easier for a detector to penetrate than recently disturbed soil due to some arrangement in the soil itself.

I once asked a group of "knowledgeable persons" if rain, weather, and time, causes the minerals in the soil to fall into a certain alignment that would allow radio waves to better penetrate it. They all totally ignored my dumb question

Yes, I believe this depth thing all has to do with this.

Badger
 

BamaBill said:
"Fresh buried is even worse than air testings when it comes to discovering a detector's true depth."

I too, have proven this fact to myself. Has anyone ever come up with an explanation for why this is so? What is it about the voids introduced when soil is removed and then redeposited that throws off the EMF or scatters it, so that the detector cannot get as good a read as it can in compacted soil?

Not an expert on this, but the soil has electrical properties based on the amounts of salt, minerals, and water in the ground. This creates an electrical profile that can be measured in conductivity, capacitance, and inductance. Once the soil is broken up, it disrupts all those time-dependent properties. It's only slightly better than an air test in that regard. Similarly, the soil is generally pressed tightly against the coin or target, and this again produces a unique electrical profile.
The MD works by measuring these electrical profiles, so of course there will be a change.

To get an idea, tune your radio to a weak station, then put your hand on the antenna. It really has a strong effect on what you hear. A coin with tightly packed soil on it is like that hand on the antenna. You will get the station, but it will come in differently.

V
 

Does anyone know anything about the Golden Umax?
Whats the difference between that and the Silver Umax?
Is one aimed at gold and the other Silver?
Robert R
 

Robert - Golden umax is a similar style of detector that has a multiple tone id where as the Silver Umax has only one tone.

ian
 

Hello,

Clay and most soil are "layered" materials, I mean on a microscopic scale. They are called layers or "Latice" in reference to clay minerals. The top and bottom layer of this clay mineral are negitavely charged and held together in the middle by a possitively charged potassium Ion making this particular clay very strong, like Kaolin. Some other clay materials have a possitively charged water molucule holding the layers or "latice" together, these are weaker, Montimilinite. All surface soils have some or allot of these clays mixed in them. When the soil layer is disturbed, as in digging for a coin, these clays and their electrical charges become "flocculated" which probably is the explanation for poor depth. Soils, by nature, want to settle and compact making these microscopic molucules look similiar to an organized marching band, whith perfect uniform layering (electrical charges too). When disturbed or "flocculated", they, the clay minerals (electrical charges too) will temporarily resemble a box of dropped match sticks until they can re organize themselves. I would think this could effect any electro magnetic field. Is this why there is poor depth? I don't know. To find out I would like to ask someone who regularly hunts plowed fields. Plowed fields would have flocculated latice strata. I would ask them if they noticed any depth sufferage compared to an old backyard. If the concensus is yes, then maybe the aformementioned is correct. Just my two cents.
 

robert roy

SaginawIan was correct that the Golden uMax has four tone audio ID. It also has a VCO (voltage control oscillator) in all metal mode. The VCO and the threshold adjustment in all metal mode is a big help for those detectorists hunting for relics because it provides better/more target information. The biggest feature of the Golden is it's adjustable notch. it's the only detector in the Tesoro line that offers this. A notch is usually utilized for coin shooting, the Golden has a wide / narrow toggle selector plus the notch width adjusting knob which fine tunes the upper and lower edges of the notch range. This is a huge feature. "Lostlake88", Good description of disturbed verses undisturbed ground matrix! Joe
 

Lost Lake, you may be onto something with your description. I have hunted a lot of plowed fields and yes, when freshly plowed your depth suffers, but get a good rain and things will start to improve as the soils start recompacting. If the mineralization lines up as you suggest and gives a less scattered return on long undisturbed ground it would explain a lot. I still think the voids created cause scattering because the electromagnetic waves travel differently through ground than through air.
lostlake88 said:
Hello,

Clay and most soil are "layered" materials, I mean on a microscopic scale. They are called layers or "Latice" in reference to clay minerals. The top and bottom layer of this clay mineral are negitavely charged and held together in the middle by a possitively charged potassium Ion making this particular clay very strong, like Kaolin. Some other clay materials have a possitively charged water molucule holding the layers or "latice" together, these are weaker, Montimilinite. All surface soils have some or allot of these clays mixed in them. When the soil layer is disturbed, as in digging for a coin, these clays and their electrical charges become "flocculated" which probably is the explanation for poor depth. Soils, by nature, want to settle and compact making these microscopic molucules look similiar to an organized marching band, whith perfect uniform layering (electrical charges too). When disturbed or "flocculated", they, the clay minerals (electrical charges too) will temporarily resemble a box of dropped match sticks until they can re organize themselves. I would think this could effect any electro magnetic field. Is this why there is poor depth? I don't know. To find out I would like to ask someone who regularly hunts plowed fields. Plowed fields would have flocculated latice strata. I would ask them if they noticed any depth sufferage compared to an old backyard. If the concensus is yes, then maybe the aformementioned is correct. Just my two cents.
 

After almost a year with my silver umax...Ive found that(as many have posted) crank the sens up as high as you can without chattering....set the disc on iron and go from there. Depending on how much you want to dig, where you are hunting, and what you're looking for, this seems to be a good starting point.
I have the stock coil and it has worked for me so far.....
Keep working at it and let us know how it goes......TC
 

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