Steve, It is funny you say about a BFO machine late last year I bought an old Whites 5900 Di Pro Plus that had never been used, the owner had bought it and put it in his loft and then bought a waterproof detector so this one got forgotten about, anyways I bought it and I put batteries in it and fired it up and It has brutal power and it has a threshold that is even better than the TDI SL,
I tested it and you can ground balance highly magnetic ground and if it still makes the threshold waver slightly you can adjust the Disc and knock it out all together, When it comes to power what modern machines do with a 15" it can exceed them using the standard "old" 950 coil, and it has no problem discing out large Iron, and it has stacked two stage GB control knobs,
I since found out that these thing have almost a cult following in the US, I phone Whites in Inverness and they told me it was made in July 1989
I always have one question in mind which is the best frequency for silver and gold jwellary or treassure hord at the same time i know 7 to 15 khz is for silver relics tressure 15khz to upper is for gold suppose if i find a cannal full of silver and gold jwellary which frequency is best suited for it
I have been watching a thread over on PA and it seems there are a few problems, But some of the replies from those pro qed folks seem a little daunting when you consider that the main issue is the ground balance and threshold, which brings to mind JP's review.
I find the TDI's a bit worrisome as in when to deploy each of the conductivity settings and find it is much easier to run the SL set to ALL, the QED would drive me nuts when you take the latest reply in to account having to do a Math equation to set the GB/Threshold,
anyway here is the link maybe one of you wiser people can translate it all in to common English.
From things I've read and heard, there is a small but loyal following for at least some of the CZ series (with single digits, -3, -4, -5, -6, etc.) and even claims that they are still today among the best coin detectors. I wasn't detecting when this series was available and don't know any more than a few snippets here and there in posts. They do show up on eBay and from (at least some of) the prices, I surmize they are still in demand. Would someone post an overview of the series, highs and lows, pluses and minuses, etc.? I think I've read that Tom Dankowski used to mod one of these models for extra depth. Also wondering if Dave Johnson had a hand in the design/engineering of this series or if they occurred in the time window when he was working elsewhere.
By Mark Gillespie
A guy found this detector in a wood pile at a local factory. Looked like it had been there for years, weathered badly, shaft was broken and coil was busted. As a challenge they gave it to me. Two days later I installed batteries and low and behold it came on. Couldn't find a manual so I went into experimental mode and can say I was impressed with the air test (for a China product).
To start with I thought it was a single tone machine, dime and nickel gave a high tone, but adjusting the ground balance and the discrimination revealed attributes that reminded me of the TDI. Now a nickel gives a low tone and a dime remained a high tone.
Next I took the machine to my test garden of over 10 years and was shocked to hear a repeatable response of my deepest targets.
Please note, I’m not promoting China products, only indicating what I found.
There is one adjustment on the side that I’m wondering about not sure what it might be.
Would also like information about this machine, the internet really doesn’t indicate when they were manufactured or much detail.