A switch or jack is not included.
Gibson printed circuit board.
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.
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.
Fits gibson usa sg or les paul.
Made in the usa price 1000 build 2 channel hand wired valve combo with tremolo power rating 4w valves 2x 5879 2x 6v6 1x 5y3.
The switch is a wedge of mahogany sprayed tobacco brown so you could think of it as a bit of a vintage gibson guitar.
Gnolivos maybe your hum problem is associated with the ground wire not making good connection to the circuit board.
Up for your buying pleasure is a gibson les paul quick connect pcb circuit board with long shaft pots and push pull volume pots for coil tapping.
New pcb style gibson electronics.
Specific to gibson electric guitars including les paul standard custom traditional classic studio 50 s 60 s tribute lpj etc.