[MrFixr55]

Hi Prof Russell,

Here is a link to the Philco Service Notes for this receiver, from our Philco Library:

https://philcoradio.com/library/download...20Book.pdf

This document shows both a schematic and an under-chassis parts diagram.

Per the document, the output transformer is located on the chassis.  One leg of the secondary is grounded.
Therefore, you should have either 3 or more likely 4 wires.  If 3 wires, the speaker would have to be mounted to the chassis to complete the voice coil circuit.  2 of these wires are to the Field Coil.  The other 2 (or one wire and chassis ground) go to the output transformer.  One of these wires connects to one terminal of the speaker's voice coil.  The other wire connects to one leg of the "hum bucking coil", wound with the field coil.  The other leg of this hum bucking coil connects to the other terminal of the speaker's voice coil.  Does this speaker plug in to this chassis or is it "hard wired"?  The Schematic does not show a plug.

For the purpose of testing, the easiest way of connecting a speaker to the radio if you have the original speaker with the missing cone connected is to:

• Inspect the original speaker and note 2 or 3 terminals on the frame of the speaker.  2 of these terminals are for the voice coil.  Very flexible wires lead from these terminals to the speaker cone if it was still in the speaker.  (You should see these same connections and flexible wires on the test speaker.) If the cone is missing or beyond repair but these flexible wires and the voice coil still exist, cut these wires. 
  

• Measure between these terminals with the speaker connected to the radio.  This should be a very low resistance, possibly less than 1 ohm.  the speaker can be connected here.  Alternately, there is a connection for the speaker on the antenna terminal.  connecting a speaker between this terminal and chassis ground will also work, but hum may be higher.
  

Hope this helps.