When did the first discriminator come out?
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Thread: When did the first discriminator come out?

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  1. #1
    us
    Sep 2020
    Texas
    Tesoro Tejon, Compadre, Silver Umax
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    27 times
    Metal Detecting

    When did the first discriminator come out?

    Any knowledge on this topic is appreciated.
    SD51 likes this.

  2. #2

    Aug 2016
    MI
    E-TRAC
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    IMO... in the 1970's.

    Garrett introduced their first TR detector in 1973...

    From their History section in their webpage; 1973 Garrett introduces its first TR (Transmitter-Receiver) metal detector. Garrett TR models during this period include the Competition Master, the Master Hunter, and the Cache Hunter.

    I got my first VLF/TR detector in 1979 and it's a Garrett Groundhog model.
    FAT SEXY and Terry Soloman like this.

  3. #3
    Charter Member
    us
    Nov 2012
    Maryland
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    I'm with SD51. Early 70's. In the 60's we had the BFO machines. My friend Paul had one of the first TR machine in the early 70's.
    SD51 and CASPER-2 like this.

  4. #4
    Charter Member
    us
    Reg

    May 2020
    San Jose, CA
    Tarsacci MDT 8000, Nokta Makro Simplex, Minelab E-Trac
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    The first discriminating detectors I can remember were the White's Coinmasters of the early 70's (I'm thinking 1972 or '73). I thought it was fascinating at the time that a MD could actually do that. I was only 12 or 13 at the time, so I couldn't afford that kind of technology
    "The only difference between the saint and the sinner is that every saint has a past, and every sinner has a future." Oscar Wilde

  5. #5
    us
    Apr 2004
    Southern Appalachia
    Whites CM2 BFO, Harbor Freight 9 function, BH Pioneer 202, Fisher F22
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    Garrett had a late production BFO with a discriminator circuit, Master Hunter around 1970.
    FAT SEXY and BillA like this.

  6. #6
    Charter Member
    us
    Feb 2008
    Great Lakes State
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    Quote Originally Posted by CalReg View Post
    The first discriminating detectors I can remember were the White's Coinmasters of the early 70's (I'm thinking 1972 or '73). I thought it was fascinating at the time that a MD could actually do that. I was only 12 or 13 at the time, so I couldn't afford that kind of technology
    My second detector was a Coinmaster II, I remember the “Bicentennial” price was on the high end of $200, a lot of money for a 15 y.o. I swear it had a half dozen knobs, and trying to set up discrimination was similar to opening a fancy safe in which you were given the wrong combo. Separate 12 AND 9 volt battery packs, that’s fourteen AA’s and if I remember right the machine ate batteries. I dug a few things but back then I had no clue. Imagine no internet, gasp!
    FAT SEXY likes this.

  7. #7
    Charter Member
    us
    May 2010
    White Plains, New York
    Minelab GPZ 7000 -- Equinox 600 -- Vanquish 540 -- Minelab Pro Find 35 // Grave Digger Tools Nemesis shovel, Sidekick hand digger // Bunk's Hermit Pick // Sponsored By Fort Bedford Metal Detectors
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    Got started with the Garret machines in the mid-1970s.
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  8. #8
    Charter Member
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    Reg

    May 2020
    San Jose, CA
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    That machine is still in great shape!
    Terry Soloman likes this.
    "The only difference between the saint and the sinner is that every saint has a past, and every sinner has a future." Oscar Wilde

  9. #9
    us
    Sep 2020
    Texas
    Tesoro Tejon, Compadre, Silver Umax
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    27 times
    Metal Detecting
    That thing just looks too cool.. Ever take it out for a spin just for old times sake?
    Terry Soloman likes this.

  10. #10
    us
    Mar 2003
    Oregon & Texas
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    It's true that Garrett marketed a "discriminating" BFO around '72. All BFO's can "discriminate" between ferrous/non-ferrous but Garrett claimed to have extended that to foil and maybe some pull tabs. IMO it didn't work well (I have one).

    Allen Hametta marketed the A.H. Pro around 1974. It was an "off-resonance" design (cousin to the BFO) and could discriminate foil, pull tabs, and even screw caps but had little depth.

    Technos introduced the Phase Readout Gradiometer in '74 which was a true TR discriminator and even had a target ID meter (definitely a first).

    Bob Gardiner also had a phase discriminator design by 1974 but I'm not sure if it was marketed at the time. All my Gardiner lit is at the office.

    By 75-76, White's, Garrett, Compass, and Bounty Hunter all had TR discriminators. But they clearly weren't first.

    So a lot of different people were working on discriminators in the early 70's but if I had to give the nod for the first TR disc it would probably be Technos. BTW, phase discriminators were being developed for eddy testing devices (basically works just like a metal detector) in the mid-60s.
    I believe it, therefore it is true.

  11. #11
    us
    CASPER

    Jan 2012
    NEW ENGLAND
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    I started with a borrowed Whites Tr Goldmaster (one of the largest machine back them) 1974
    My first personal machine was a Compass Tr 94B in 1975 - all metal
    around then is when discriminators were coming out by all companies
    I found way too many goodies with others and around using discriminating machines
    even now most times i hunt in all metal and still find goodies in spots others say they
    cleaned out with their high end discriminators
    FAT SEXY and 3cylbill like this.
    Motto = "I try to hit where others cant or others wont "

  12. #12
    us
    May 2019
    Flawda
    Garrett AT Pro, Bounty Hunter Tracker IV
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    I had one of Whites Coinmasters in early 70s. Great machine!
    FAT SEXY likes this.

  13. #13
    Charter Member
    us
    ARC

    Aug 2014
    Bahia Del Espiritu Santo - "Bay of the Holy Spirit”
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    If I am not mistaken... the first discriminator waaaassss...

    I think it was the Stegosaurus Dinosaur...

    It did not like the Raptors OR the Tyrannosaurus Rex.
    FAT SEXY and SD51 like this.
    DETECT WITH RESPECT - Have permission... Fill holes... Dispose of trash. - The Random Chat Thread - http://www.treasurenet.com/forums/ev...en-24-7-a.html

 

 

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