The mailman brought my Tejon with stock and 5.75" coil this morning. I had some new batteries all ready to go for it, I slapped them in and went out in my yard with a quarter,dime,nickel and penny. I had the stock coil on it, first thing I noticed when I went to ground balance is I didn't have any threshold if playing with the threshold dial I would at times get a slight threshold buzz. Next thing I noticed was the ALT. Disc. discriminated out everything no matter where it was set. I went and grabbed my can of electronic cleaner/lubricant and gave the toggle switch a spray, opened up the faceplate and gave each control a spray. Now when trying it, it seemed as if it was stuck in all metal mode (it wasn't clicked into all metal), so I gave the toggle another good spray and worked the toggle back and forth a good amount. Now everything seems to work except getting a threshold like it should. I then put the 5.75" coil on it and everything works as it should including the threshold. In summory when using the small coil I can increase and decrease or anywhere in between the threshold. With the stock 8x9 coil I have very little if any control of the threshold no matter if it is clicked into all metal mode or if I hold the toggle switch. I get good air test results, I have owned and used a Tejon before and this one seems to do its job but I am pretty fussy and know it isn't perfect. I am hoping that after I find my 1.5mm allen wrench to remove the knobs (all knobs have a o ring on them) and get the stems,etc. good and clean and dose them with another shot of spray that it will be 100%. You can tell that it was used but doesn't look abused, I think it has been sitting without being used for some time.