Thanks to all of the helpful information on this forum I was able to restore my first ghettoblaster! My original goal was just to dust off an old boom box but that quickly spiraled into much much more. Through a lot of trial and error (lots of errors) my M9935K has a new paint job, bluetooth integration, some LEDs, and Blaupunkt speakers.
Best of all it still sounds great and runs off battery power!
Best of all it still sounds great and runs off battery power!