Wurlitzer 200A Electric Piano Aux Out Pot
This Aux out pot is for adjusting the gain of your output to an amplifier. It is located underneath the bottom of your Wurlitzer next to the headphone and aux out jacks. This pot is always filled with gunk because it sits on the keybed inside where all the dust and dirt collect and fill up the pot. The wires connecting to this pot are usually in bad shape as well and can contribute to output problems. A new pot and cleaning up your wiring is a good idea.