Quote
Harold,ILL.
He matched it up with the 8" Brown donut coil and it is a perfect match. ---- I also bought a 5.75" coil that is hot too as dug a war nickel with it over 8" easy with a high tone. ---- They are very picky though with coils as tried a 7" Precision and a 10.5" Concentric and they both mixed the tones past 5". But The 8" and 5.75" work perfect.

Glad to hear your Golden µMAX is working OK for you, at least with the two search coils. 'Matched' is a god word to use with all of the "turn-on-and-go" Tesoro's because the search coils used needs to be 'matched' or 'calibrated' which are just terms to refer to Ground Balance effectively for that specific model. That was the one annoying weakness in circuitry design with most Tesoro's, the need to have a very 'proper' or 'functional' GB based on the specific search coil attached.

Tesoro used the word 'calibrated' when someone had a detector and two or more search coils and noted that the detectors was 'noisy' or 'falsing' a lot. They would ask the owner to send in their detector and all the search coils to have it 'calibrated', and that simply meant they would check the coils to make sure they were all 'in spec" and then would tweak the internal GB trimmer so none were going to be noisy from having a too-negative GB. that only meant the most 'off' coil / detector combination was tuned or calibrated so that the GB with that specific coils was not to negative a GB.

Then the other coils could be used w/o falsing, but there was a trade-off. It meant that the coils on the other extreme might have a too positive GB and, depending upon how positive that was, it could have a negative impact of detection depth, target response quality, and even be so positive that the detector might not give a good response to some higher-conductivity targets, such as big silver dollars, and even silver or clad halves or quarters if too positive.

It sounds like, in your case, you have a Golden µMAX that as close to ideal GB settings for the 8" and 6" Concentric coils you're using and those would be the only coils I'd use on that model.

Monte

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Metal Detector Evaluations and Product Reviews monte@ahrps.org ... or ... monte@stinkwaterwells.com 503-481-8147Detector Outfit: A selection of my favorite makes and models, with the best coils mounted, for the tasks I'll take on.Pinpointers: Pulse-Dive & ProPointer AT .. Headphones: 'Hornet' & 'Wasp' .. MS-3 Z-Lynk .. ML-80 .. N/M Green edition*** All working well today to make memories for tomorrow. ***