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Gold Mountain GMT1650

GMT1650 has same PCB that King Cobra.
with the exception NOTCH part was excluded. Merc sent me some pics of the 1650 board.
 
the same models with the toggle-selected expanded low/high Discrimination adjustment.

The King Cobra was different in that it had the Notch Disc. circuitry and lacked the selectable expanding Disc. range.

In descriptive terms, the King Cobra, a too-close copy of Tesoro circuitry for the Golden Sabre Plus units, also operating at 15 kHz, had the more limited lower Discrimination adjustment. That was before Tesoro went to the ED-120 for a bit lower-end adjustment.

The Cobra and GMT-1650 had the broad Discrimination that allowed a minimal acceptance, ferrous and non-ferrous, similar to the Tesoro ED180 term for All Metal Acceptance at the minimum Disc. setting. The Cobra/GMT-1650 was one of the best models I ever used for being able to "fine tune" the rejection desired, especially in iron littered old town sites, homesteads, and urban renovation, etc. I was one of the GMT Distributors when they came out and I mentioned the one major thing they goofed on was not adding a Threshold control for the All Metal mode.

Sadly, Gold Mountain Technologies major errors were really poor marketing decisions combined with irritating Jack Gifford at Tesoro for the circuitry issues. Too many bad moves when they had some models that could have grabbed a certain niche of the market. I wish they were still available, and easily/affordably repairable. Of all the long-gone manufacturers, that is the one model [size=small](Cobra or GMT-1650)[/size] that I wish I still had on-hand with the smaller coil for dense trash.

Monte
 
I have a King Cobra I occasionally pull out. Not my original one I had back in 89 or 1990 or so. That one developed a coil issue and I sent it in for repair at exactly the same time the company was folding!! Well after numerous phone calls etc, I got it back in pieces from their service dept , luckily I had put a return receipt on it so I knew they had it, put it back together and traded it in at my local metal detector dealer. I missed that unit..I was using it in conjunction with a pair of Depth master headphones (not sure they did anything special with their little built in amplifier) but I got so used to what that machine was telling me, pulling out deep dimes/ IH was common. Well flash forward to 2014, I came across a really good shape used one on one of these forums, and now have a King Cobra back in collection. Very happy I do!! PS..if you know where I can get the plastic coil cover for the standard 8inch coil let me know!
 
alkazoo said:
I have a King Cobra I occasionally pull out. Not my original one I had back in 89 or 1990 or so. That one developed a coil issue and I sent it in for repair at exactly the same time the company was folding!! Well after numerous phone calls etc, I got it back in pieces from their service dept , luckily I had put a return receipt on it so I knew they had it, put it back together and traded it in at my local metal detector dealer. I missed that unit..I was using it in conjunction with a pair of Depth master headphones (not sure they did anything special with their little built in amplifier) but I got so used to what that machine was telling me, pulling out deep dimes/ IH was common. Well flash forward to 2014, I came across a really good shape used one on one of these forums, and now have a King Cobra back in collection. Very happy I do!! PS..if you know where I can get the plastic coil cover for the standard 8inch coil let me know!
Click to expand...
Great post as always wanted to try a King Cobra. I was curious how deep were the Dimes and Injuns as heard they were not depth monsters by todays standards? Thanks.
 
http://www.treasurelinx.com/gold_mountain.html this is Sven site and there you may see King Cobra PCB copy I did. can you go in a forum of Moreland? http://www.geotech1.com/forums/forum.php
then I could be tell you more about how to mod King Cobra board to GMT-1650.
 
Your right Harold,,,not deep by todays standards. I remember pulling out merc dimes and IH pennys in the 4 to 6 range, possible a inch more. But you know like I do, you just never know..lol...Ive been in yards the past year or two with my ATPro and dug a IH penny at 2 inches!!! Yet, dug zinc lincolns at 8 inches!! Hard telling how those coins settle in the ground. I worked a turn of the century home back in 90 and 91 with that King cobra,dug many a old coin with that detector in the 3 to 6 inch range, including my oldest silver 1906 barber dime. I would love to get back in that same yard today, 25 years later with my atpro (soon to be Etrac) and see what I missed... Would have to knock on the door for permission as the owner I was dealing with at the time has long sold and moved away...
 
Just picked up a GMT 1650,tried to download a picture but couldn't,have a picture of it on the Compass forum.Detector works good,the Low,High Disc swicth I like.also the manual GB.light weight,and is deep in all metal mode and not too bad in disc mode.Will have to try it out in the field,but so far, I like it alot.
 
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