2. Bad capacitors: Capacitors are another common source of humming in Hammond organs. If a capacitor is bad, it can cause the power supply to fluctuate, which can lead to a humming sound. To fix this, you will need to replace the bad capacitor.
3. Ground loop: A ground loop occurs when there is a difference in electrical potential between two or more grounded components. This can cause a humming sound in your Hammond organ. To fix this, you can try connecting all of the grounded components to a common ground point.
4. Faulty power supply: If the power supply to your Hammond organ is faulty, it can also cause a humming sound. To fix this, you will need to replace the power supply.
5. Loose connections: Loose connections can also cause a humming sound in your Hammond organ. To fix this, you will need to tighten all of the loose connections.
6. Faulty tube: A faulty tube in the preamplifier or power amplifier of your Hammond organ can also cause a humming sound. To fix this, you will need to replace the faulty tube.
If you have tried all of the above and the humming sound persists, you may need to take your Hammond organ to a qualified repair technician.