I've never seen a 500 in a cabinet like that, it almost looks older than the machine. They booth look like they are in top condition though and looks great in your living room. I guess you are all onto oiling and cleaning things. There are lots of info on these, one of my favorites is the Archanic Arcane blogs, she talks you through it in detail, and there are
lots of posts on the slant-o-matics. They are all of similar build, even if the exterior can differ a bit, take or give a few knobs, levers and built in features they are not too far from each other. A
visual guide can make it easier sometiems too. You might not need any of the links, but it was the first things I thought if when I saw the picture. It looks very clean and nice.