I dropped one of my CAB-1's and it stopped working.

I opened the case and see a red wire broken off the round disk which is imbedded in the back case and also has a black wire soldered to the disk.

What is this round disk?

Can anyone source the technical manual for the CAB-1? I found the original Patten data sheets on line but does not help.

hwell: When I try to solder the red wire to the disk, the disk will not tin and the solder will not stick to the disk.
Denny Todd
Las Vegas, Nv.