[R-390] CU1638/GR multicoupler

[jgolden365 at aol.com]

I have one of these dandy CU1638/GR multicouplers, bought from Fair Radio years ago.  It has unusual connectors  (type N?), serves six receivers, is only about 3 inches high and fits nicely in an equipment rack.  No tubes, all solid state.  Does anyone have any experience with this gadget?
 
I also have an equipment rack on casters free for anyone who wants it.