Read the OP’s original post very carefully.
He gives some very specific conditions for comparing the performance of $200 to $400 detectors compared to older higher end detectors.
Some of those $200 to $400 US detectors have simultaneous multi frequency and selectable single frequency operation that is very effective in the conditions laid out in the OP’s question.
Carl NC is dead on with his statement: “The result is, some of the better old-school detectors (MXT, F75, Tejon) are still good hunters in some places, but the newer detectors are good hunters in a lot more varied places.”
I will echo that statement with a clarification, “but the newer simultaneous multi frequency detectors are good hunters in a lot more varied places”
I hunt roughly 1,000 hours per year for coins, jewerly and relics and have been doing that since the Equinox 600/800 was released back in early 2018 so roughly 8,000 hours total. I can only remember one 2 hour session when I was near an electric cattle fence that I had to switch to 20 kHz selectable single frequency or just quit and go home due to high EMI from that electric fence. All the other 7,998 hours using these newer SMF detectors, I was using them with the Multi settings. The accuracy of the detectors I use for the most part when in Multi is really astonishing even on deep targets. There are a couple of exceptions from my experience (Minelab X-Terra Elite and Equinox 700/900). That accuracy and depth is gone as soon as I switch them to one of their selectable single frequency settings.
BigTim is producing some very good YouTube videos about these low to mid range SMF detectors at the moment. Just have a look especially at his Deus 1 versus Legend 2 video for a good example of single versus SMF for target ID and target tone accuracy.
I don’t have an issue with the MXT, F75, Tejon or any other higher end single frequency detector along with the Fisher CZs, Whites DFX, V3i, Minelab BBS/FBS as far as how well they detect in very mild to light mineralization. If those are your conditions, good for you, you may not need to consider a possible upgrade. If those are not your ground conditions you should consider an upgrade.
Also, I think BigTim would agree that the new XP Icon series is a very viable choice for a budget minded, newer tech SMF/selectable single frequency detector, if you hunt in some of the more difficult conditions that the OP laid out in his original post.
Yes I have to agree very much with Jeff, jmc24 here in this statement
The Tejon, Cortez, bandido, bandido 2, vaquero, MXT, Fisher 1260, CZ5, CZ6, DFX, XLT are a few of the upper end analog units I have owned.
Did I use them all to their full potential?.....no and I do not believe anyone could for that matter but like most of the other users who owned them I did my best with them here where I live.
Every one of those units were excellent metal detectors and worked great at the time.
I would still own some of them but I am only aware that Centreville electronics are able to repair Whites. I do not think First Texas are messing around with the old los Banos fishers anymore either but someone correct me if they know. I may be wrong but since they gave up their CZ line I kind of figured they may not be repairing the older ones.
Plus coils are getting expensive and hard to come by.
Now with that said.....they all take batteries....so you get about 25 hours with using a set of headphones with the MXT if I remember right with 8AA batteries.
Well that adds up and 9 volts are stupid expensive now and you cannot use the high powered 9 volts in some of those units because they push out too many milliamps compared to regular 9 volts and will make some of those detectors act erratic sometimes.
With that said the rechargeable machines are way more economical to use all the way around along with their rechargeable wireless headphone
I tried to go back to an mxt for a little while because it takes regular batteries but the outdated performance was obvious compared to the new technology
I had minelab 540 vanquish and it ran great and performed very good. It will ID Deeper targets more correctly than the MXT will using the stock concentric coil
The new XP Icon will definitely out perform the MXT on seperation and has the ability to ID targets beyond the abilities of the MXT from my own experience.
The Icon cost around 699 with backphones currently.
The MXT tracker was around 800 bucks or so back in 2002 new. Take in the account of inflation that is about $1490.00 bucks today!
The Minelab Xterra elite....it does ok and by itself is 415 bucks or so without the extra coil
I have to admit it with the stock V12 coil will have somewhat bouncy TID numbers but it too will sound off better on deeper targets and seperate better than the DFX and MXT ever did for me.....and I liked both of those units.
The Xterra elite has a decent sized screen and I like the red backlight on it....plus it can use the equinox coils too.
People seem to love the Nokta score units but I have never had one myself.
Even the Garrett Vortex does better than the older single frequency flagships from yesterday too.
jmc24 loaned me his Garrett Vortex for a few days for me to run a few comparison videos.
It too performs better than those old whites, Tesoro and fisher units
Plus most of these new multi frequency detectors all have the ability of switching to mono frequencies as well except for the vanquish series from what I understand as they seem to be fixed in multi iq only.
I made some videos recently showing the XP icon alongside the XP deus and a few other units.
I have already made a video between the XP deus and XP icon however I was using the Deus 2 FMF 9 inch coil in that video.
I now have the 11 inch coil that was designed for the icon series.
So maybe the next couple of days I will make another video showing the icon with its stock coil compared to the 1st generation XP deus.
I still like the XP deus and it does well for me here in my mild soil.
So until I can remake another video with the 11 inch icon coil paired with the icon....here is a comparison between the XP icon and 1st generation XP deus both with 9 inch coils
If some of you guys are still swinging those older VLF units I don't blame you.
However from my own experience they are gonna go south sooner or later. I have had several Tesoro coils go bad along with some of the whites 950 coils.
The battery holder doors on the Tejon and cortez units will eventually fall off because of the plastic hinges.
The 4AA battery packs for the old fisher 1260 and 1270 units will have one of the 9 volt style connector fall off too. Good luck finding some of those these days.
The battery terminal tabs break off inside the dfx, XLT and MXT units and with time the V3i and Vx3 will suffer the same thing.
I have had to repair those myself in the past.
The MXT and M6 have a circuit inside that will go bad and the speaker will stop working only allowing sound to come through the headphone jack. I have had to send those to Centreville electronics and they were charging a flat fee of 85 bucks about 2 years ago just to open it up and the parts and labor are added to that cost along with shipping both ways 2 years ago was about $145 bucks for me per unit.
Anyways here is one of the videos I made between the XP deus and XP icon