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Don't know if the knob is a push-on kind, but if it is: if there's space, see if you can drip a little WD-40 into it with a toothpick or something and let it sit. Then loop a piece of strong cord or insulated stranded wire around the shaft behind the knob so you have the two ends coming out at you 180 degrees apart and long enough to loop around your hands and give alternating tugs. I had to do this on an RCA where one of four knobs would not budge.
Of course what we really need is a Grundig guru on here to say what kind of fastening the knob really uses.
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Reece
Perfection is hard to reach with a screwdriver.
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