Restoring US car radio: is that worth it?

My car radio (AM+FM+8 track) produces a quiet hum at maximum volume setting, which is still accompanied by a quiet, periodic “plop —- plop”. I can influence this sound with the Balance+Fade regulator, but that’s it. No reception in midwave and VHF. I couldn’t test the 8-track-function, because I don’t have a cassette for it yet. Maybe the mechanics are also in need of overhaul. For around 200Euro you get in the bay (allegedly) to buy outdated or at least functional radios of this kind. Mostly the front is slightly different, but the corresponding parts could be exchanged in order to obtain a 100% original optics. Therefore the question: is it worth a repair of the original radio? What must one plan for an instant setting about? Who knows possibly competent providers? A new radio is not in question for me. I at least want to maintain the original optics.