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I forgot to mention that I did tack solder some new electrolytics into this one just to find out how close it is to working. It seems to show signs of low sensitivity like you mentioned. After I install the caps permanently, I'm going to hook it up to the signal generator and scope to do a side-by-side comparison with one of my other 706's to try to determine the cause. It may need some tweaking, but it didn't look like anyone had been inside this one. Hopefully it's not a tin whisker problem in one of the transistors.
One thing I did notice though is that the loop stick antenna in this one is different than my other 706's. The windings on the ferrite bar go from one end to the other. There is just barely enough room for the 2 little metal clips that hold the bar to the circuit board. My other 706's have windings that use just 3/4 of the bar length.
I'll post my findings when I get there.
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