Normally, we don't allow price checks like this on our forums. However, you're talking about old consumer stereo gear from the late 70's that sold new for $350 - $400. See
this ad from November 14, 1977.
The turntable is probably belt driven. If the turntable motor still works, from its age, I'd guess it probably needs a new belt. It has a cassette player, which also is probably belt driven so it would have the same problems. The speakers used in such models were nothing great, just consumer stereo stuff.
If it all works, it could get you a few bucks at a garage sale (possibly more as a museum piece

), but it wouldn't have a number of features most folks would want in a contemporary unit. If it doesn't work, it's not worth its weight in door stops so recycle it properly. Best Buy and other stores accept obsolete electronics for proper disposal.