Hey Sean,
I think most tech guys could replace those screw terminals with some version of a binding post (you may have to supply a decent one). I've seen it done quite often on some Dynaco Stereo 70s. It's probably not all that expensive, but I don't know if it's possible to put them on the Marantz. If you plan on selling...collectors prefer them to be all original stock, but I would think that anyone planning on using the amp would probably love decent binding posts.
I think most tech guys could replace those screw terminals with some version of a binding post (you may have to supply a decent one). I've seen it done quite often on some Dynaco Stereo 70s. It's probably not all that expensive, but I don't know if it's possible to put them on the Marantz. If you plan on selling...collectors prefer them to be all original stock, but I would think that anyone planning on using the amp would probably love decent binding posts.