The Grundigs were all good sets. (Sandy, your uncle's Grundig must have sounded great; I've read good things about those older sets, especially the ones built for stereo FM.) I had one about 30 years ago (Grundig model 2168, table model, in a blonde cabinet) which I got from an old friend. The radio was in pieces and the dial scale was missing when I got it, but I was able to get it to work fairly well across all four bands. Because the dial scale and tuning mechanism were missing (I replaced it with a piece of wood and two knobs from my junk box), I drilled a hole in the side of the cabinet and used a length of plastic tubing attached to the tuning cap shaft (fortunately, it was on the lower right side of the chassis, so a short length of tubing fit on it nicely). I left the tuning eye dangling at the left end of where the tuning scale would have been (near the volume control). The darn thing worked, and well, for a couple of years (I even hooked up an old Webcor RTR mono tape recorder to the DIN socket at the rear of the set, and made a nice mono sound system), but eventually I noticed that the FM tuning range stopped at about 106 MHz; the FM quit altogether shortly thereafter. Not having a schematic and not being familiar with Grundigs, I eventually gave up.
This was years before I discovered the Internet and AK; believe me, if this had happened a few years ago (when I joined AK) rather than three decades ago, I would have come here for help as soon as I knew I was up the creek (as I was with the tuning issue).
Oh well. Live and learn, I guess.