It looked like they were all screwed around with and overheated w/ a soldering iron. Like repeatedly soldered to death.Excellent job on cleaning off all that puke and toasty wire ends. Why did you replace the crusty carbon comps?
I knock stuff off the walls here on 7. I've had to buy new picture frames and secure them with Two sided tape.
I think your purple wire (violet) connected to 4 ohm is NFB to the phase inverter.AMS, As I am seeing things, the thick green goes to the 16 ohm pin, the yellow to the 8 and the Black goes to the 4ohm. The Green has a thin/ small jumper from the green 16 ohm pin to the center, while the 4 ohm also has a Purple wire on the pin with the black wire. Yellow is just the one yellow.