If this were my instrument i would open the control cavity again plug it in and wiggle that light green plastic thing that is near the switch.
Gibson printed circuit board.
One near new standard pot assembly circuit board from a recent gibson les paul electric guitar.
Bridge pickups switch and ground connections are clearly labeled for easy solder less wiring.
1956 gibson ga 40 description 15w cathode biased combo amplifier.
Includes output jack connector nuts and washers.
New pcb style gibson electronics.
Fits gibson usa sg or les paul.
Gibson quick connect printed circuit board with push pull coil splits.
A switch or jack is not included.
Gnolivos maybe your hum problem is associated with the ground wire not making good connection to the circuit board.
Specific to gibson electric guitars including les paul standard custom traditional classic studio 50 s 60 s tribute lpj etc.
Pup connectors and more.