[MrFixr55]

Hi Cdoyl,

Look at the old speaker carefully. There are 2 "coils" in that field coil. The one with a high resistance of 1600 -1700 is the one connected between the + terminal of the 2 Caps, 57 and 40A. The other coil is the "hum bucking" coil which you can either leave out of the circuit or put it in. However, if you use it, polarity is important. one direction will "buck" the hum; reverse the connections, and the hum will be boosted. Use the best of the 3 options. The Voice Coil does have 2 connections. one may be directly to the frame of the speaker. Car radio manufacturers did this a lot in the 50s, and Philco was a major car radio manufacturer.

The Schematic that Ron Ramirez shares in his link shows the connection between the hum bucking coil and the transformer to be grounded to the chassis.

If you can post another pic of the speaker with the voice coil and hum bucking coil connections more visible, this will be helpful, as well as a pic of the wiring extending from the Output Transformer secondary.

Best Regards,

John, MrFixr55