[quote stewartlittle]Any one know something about these?[/quote][size=medium]Yes, it is an early VLF (GEB)/TR-Disc. model. They were rather competitive, IN THEIR DAY, but pale in comparison to most anything offered now. The Very Low Frequency (White's calls it GEB) mode is the one you would generally search in after making the basic adjustments and adjusting the Ground balance to your search site.
Once you locate and pinpoint a target, you would switch to the TR-Discriminate mode to qualify the target as a potentially desired or trash target, all based upon the Discriminate level you are using. The challenge, with any conventional TR or TR-Disc. operating mode, is maintaining a uniform coil/ground relationship. You must switch to the TR-Disc. mode with the coil at the search height and restore the set 'threshold' hum (using the pushbutton) with the coil to the side of the pinpointed target. Then you can sweep across the target spot and listen for an increase, decrease, or no-change in the threshold. If you raise the coil from the ground the audio will get louder because you've reduced the influence of the mineralization on the electromagnetic field, while lowering the coil closer to the ground will cause the threshold audio to null out and go silent. If wither of these occur, you have to STOP, Press the Button to restore the Threshold, then search at that coil height. It doesn't have ground compensated motion-based discrimination like virtually every model made today.[/size]
[quote stewartlittle]I have one and dont know that much about it.I can through a quarter on the ground and if I raise the coil up more than 3 or 4 inches it dont pick it up.
I GBed it,
SEN. max
VOL. max
THRHLD. 5-6
DISC. 1[//quote][size=medium]That model should be operated with the Volume and Sensitivity at 'Max,' and with a the Tuner set for a slight audio Threshold of sound, then Ground Balanced. The reference number for the Threshold isn't meaningful because it can vary from unit to unit. I'd keep the Disc. level at the minimum setting or just at the point where it rejects a common iron nail.[/size]
[quote stewartlittle]Also in DISC. mode it goes silent,is it suppose to do that?[/quote][size=medium]Yes, if you lower the coil toward the ground in the TR-Disc. mode. If that happens, just hold still, press the retune button until the Threshold audio is restored. Once you adjust the Threshold setting, you should only use the pushbutton to restore it and not fiddle with the tuner control.[/size]
[quote stewartlittle]Is it a decent detector?[/quote][size=medium]It was a quality -built detector that was competitive in it's day, but those days are long past. As you've noted, it is heavy and fatiguing. I