Panasonic RE-784A Radio Speaker/Transformer Wiring

[Reece]

If the speaker jack has three terminals, it's a closed-circuit jack which cuts off the radio's speaker when an external speaker or headset is plugged in. The wiring for that is easy. The red and blue wires coming from the chassis are the usual colors going to the primary of the output transformer. The black and white wires going back into the chassis are throwing me off and why I would like to see the section of the schematic around the speaker and output tube. I wouldn't want to recommend a hookup without seeing the diagram. If it didn't have the black and white wires I'd jump in feet first! Maybe someone reading this has a similar Panasonic radio and can post the schematic or scope out the wiring.