11-16-2020, 11:10 AM
The left terminals are numbered 1, 2, 3, left to right. Terminals 1 & 2 are for the AM loop antenna. Terminal 3 is for an external speaker. The connector to the right is the FM antenna, back in the day a set of TV rabbit ears worked fine. Here's a link to the schematic and much more information:
http://www.nostalgiaair.org/resources/637/M0013637.htm
http://www.nostalgiaair.org/resources/637/M0013637.htm