[MrFixr55]

Hi Wallace.

Cleaning up in my backyard, I was amazed at the things that "passed" through our dog.  Ms. Fixr had a cat also (Notice that I did not say that it was "our cat").  One day she thought that the cat sat on a piece of tape and tried to pick it off her little cat butt.  1 foot later....

OK, the speaker wire has 4 pins.  Attached is a pic of one of my Philco 20s, that I "experiment" on, as the cabinet is a total mess.  The pic is of the speaker plug that I made out of a tube socket. Refer to the pic below:
   

From the outside view of the chassis rear apron, the 2 smaller pins at the bottom go to the plates of the output tubes.  which is which is not important. The upper right large pin is the output transformer primary center tap and one leg of the field coil.  This point is denoted "D" on the attached schematic diagram below.  The upper left pin is Point J on the schematic, the other end of the field coil. The schematic of the Audio section:
   

Hope this helps.