Thanks for the advice. I went to the shop and tried setting the XLPro in TR mode, and made a feeble attempt at a GB with some soil samples.
I was unable to set up a "decent" GB. But was able to detect the larger silver coins in the TR mode. The analog meter still "pegs out". But at least the audio is consistent. It's a bit late here right now, and the neighbors already suspect I'm a bit nuts.
So I'll give that GB a go tomorrow, when it is daylight. If I can't get it figured out, I could send it your way and you could take a shot at it. Just let me know if you want to give it a try.
By the way, I've attached a pic of the GoldFoot and HotFoot, side by side. It appears Applied Creativity, Inc., out of Philomath, Oregon made the coils. And if I recall, this is the Company that use to make all the BigFoot, HotFoot, HotShot etc coils for Jimmy Sierra. From what I understand, the gentleman who made these coils passed away a couple years ago. And as far as I know, no one has taken over the manufacturing process. HH Randy
P.S.
Here is a post I found on the 'ask Jimmy Sierra" portion of his website:
I have a Goldfoot Magnum Force search head 2-1/4"x
9". I can not seem to find any info. on it or which detector(s) it was made for.HELP-PLEASE!
From what I can recall, the Goldfoot you have works on the 6.5 khz detectors, of which your Di Pro is one . and therefore should work. If your cable is the thin type on the detector as well as on the loop, then I am sure it is a match. One way to find out is to plug it in and see if it works. It cant hurt the detector. I believe the Goldfoot was differential. In other words, the front half is positive and back half negative. This means that the full loop is sensitive when you are in the discriminate mode. When you squeeze trigger to pinpoint the front half stays positive and hears the target and the back half goes negative and rejects the target. The target is dead center from to back and side to side. You can check this by waving a target across the coil side to side from the front to the back. If you hear the signal on the whole loop, but when you squeeze the trigger to pinpoint you can only hear the target on the front half of the loop, then it is differential. If this is the case, you must ground balance with the tip of the coil on the ground with the coil at a 45% angle to the ground. ( the rear half of the coil is in the air)
If the coil is NOT differential, then the whole coil is sensitive from tip to tip both in disc or with pinpointing with trigger squeezed. In this case ground balance with the whole coil flat on the ground like your standard round coil. Hope this helps. Jimmy