Well......Thanks all. I hooked it up in my truck just a bit ago,slapped the mag base CB antenna on the roof,and turned it on.
I set the small center 4 position knob all the way counter clockwise. All it says is 146 on the left and 147 on the right,with 2 "clicks" in between the 2.
Then I set the 2 "receiver channel" knobs both at zero. I slowly turned the right hand one all the way to nine. Along the way I heard all sorts of strange noises,from growling,to both high and low pitch thumping sounds,and many I cannot describe.
The I placed the left hand knob to "1" and did the 0 to 9 sweep on the right knob again,with similar results.
Repeated these actions for all 9 positions of the left knob,and repeated the ENTIRE procedure for all 4 positions of the small center knob.
With the 4 position knob all the way to "147" and receiver knobs set at (left hand) 1 and (right hand) at 3 I briefly and only once heard a human voice saying "repeater" and then a number,which I do not now recall. I stayed on that setting and listened for a minute or 2,but never heard this again.
I realize you guys are probably having a good chuckle over my explanation,above, but in spite of that,would anyone care to tell me what I experienced?
I suppose I was expecting to hear more voices at various settings,and was a bit disappointed about it.
On a positive note........I think this old radio actually works!