Why not hook them up and listen to them? You may find you don't want to sell them? You can use your DVD player as an input for the system, play CDs through it.
Also there are companies that specialize in old classic gear, Oaktree rings a bell? It's Oaktreevintage.com, they may buy all of that gear from you, even the broken stuff, if not them there are others If you don't want to go through the trouble of selling it one piece at a time. Google the name of each piece and see what they are worth, you'll see similar items for sale somewhere. You will be surprised, worth more than you think.
But hook it up! You'll be surprised at how nice that stuff is! I'm sure all of us here on this forum will help you in any way to get you started.
Also there are companies that specialize in old classic gear, Oaktree rings a bell? It's Oaktreevintage.com, they may buy all of that gear from you, even the broken stuff, if not them there are others If you don't want to go through the trouble of selling it one piece at a time. Google the name of each piece and see what they are worth, you'll see similar items for sale somewhere. You will be surprised, worth more than you think.
But hook it up! You'll be surprised at how nice that stuff is! I'm sure all of us here on this forum will help you in any way to get you started.