[keith49vj3]

All, I picked up a Philco 50-925 for a couple of dollars so I could demo sweep alignments for folks in my radio club.  This radio has not been worked on before with the exception of the 4 antenna wires in the cabinet and the blue wire going to the top of the tuning cap that had been cut.  The cabinet loop antenna has four leads and none have continuity between them.  These attach somewhere on the four post terminal strip shown in the photo below.  There is a green wire on what I have labeled terminal C that connects to the high side of the audio transformer secondary.  This is not shown in any of the available schematics but is visible on the SAMs photofact and other pictures I've found online.  I haven't found any information on how the loop antenna connects to the radio.  I did attach a long wire antenna to the terminal I've got marked "A" and can pick up a few AM stations.  For those that have a subscription to radiomuseum the SAMS and Rider schematics can be found here radiomuseum schematic.  Antique Electronic supply also has the schematic posted here schematic.  Can anyone help me figure out these connections?  What's with the high side of the audio transformer going to terminal C? 
Help!
Keith