Eric,
That is a nice example of the CTC-5 "Wingate" model. The # suggests it's the French Walnut finish cabinet. You may have seen it's brother in my collection in the Maple finish. Mine is also in extremely fine condition. You can view my "Wingate" by scrolling down on my web page. And none of the tube sockets are supposed to be "empty" in that chassis.
http://community.webtv.net/stevetek/StevesCT100