Musical Design D-140 Amp


I have currently obtained an old sound system from my mom.  She had a boyfriend way-back-when who thought he was the shizzle when it came to this stuff.  My mom told me to get this stuff out of her house, and now uses a compact Bose system.  Seems the amp may be a good one, but I'm not sure about the other stuff.  I wanna sell it, but I'm totally uneducated when it comes to this stuff. 

Musical Design D-140 ampHarmon/Kardon FL 8300 5 disc changerHarmon/Kardon  TD 420 cassette deckHarmon/Kardon HK3250 tunerSpeakers, cords, etc.
Should I sell as a package?Is it worth anything?
reenwad
Is a preamp ( control amp, with volume ) part of this group of components, which is necessary in connecting it all together ? If you PM me ( click on my name, and follow prompts ), I will discuss further. Enjoy !, and be well. MrD.