In Europe the electrical setups usually had capacitors to prevent interference with the electrical signals to appliances like Radio or TV. These can look like two AA batteries with wires on each side, they can be more squarish too. Usually they are some where near the three pin socket on the machine. They can be replaced or simply removed, and it is one of the most common reason for sewing machines to start running on their own. Capacitors deterorate with age and will need to be replaced. The interference is not a big thing, you can simply remove them, but even these days it can interfere with DAB and digital TV signals. There is probably a set of capacitors in the pedal too. You can by replacement sets for the old Singer pedals various places.
Last edited by Mickey2; 06-07-2020 at 05:25 AM.