How to test vintage Hammond console radio speaker using synth and Heathkit high voltage power supply

These old speakers utilized an electro magnet that doubled as the power supply choke. You can test them using a bench high DC voltage supply and current limiting resistor. Even wiothout current applied to the coil, you will achieve music from the speaker, however it will be weak. This tek Tip will aid you in troubleshooting low audio from your old tube radio.