How to Troubleshoot a Loud Popping Noise in a Musical Organ

Vintage organs are especially prone to making popping sounds.

Electric organs, such as the iconic Hammond B3 or Fender Rhodes, contain an array of moving parts that contribute to the distinctive sounds that the organs create. However, these parts are also prone to creating unwanted sounds. If you are experienced a loud popping sound when playing your organ, this will seriously impede your enjoyment of the instrument. It may even prevent use altogether. There are various causes for loud popping sounds in your organ. Troubleshoot the problem to determine its location, nature and severity to make an educated decision about repairs.

Things You'll Need

• Phillips screwdriver

Instructions

1. Turn your organ on and leave it for a minute to warm up. Typical vintage organs, such the Wurlitzer, are connected to an internal tube amplifier. If the popping begins before you play the organ, you can determine that it is not related to the keys.

2. 

   Bad slider and dial connections may cause popping.

   Adjust each parameter control before playing. Move the volume sliders back and forth, turn the dials and slide the draw bars. The draw bars on a Hammond B3 and the volume sliders on the Fender Rhodes are connected to a potentiometer, which governs the flow of voltage across the organ's circuit. If touching one of the parameter controls causes the popping sound to occur, this isolates the problem either to the dial or draw bar itself or the connected potentiometer. When switching between the "Soft" and "Loud" configuration on the Hammond B3, a popping sound may occur if the C23 capacitor is leaking.

3. Play each key, from left to right. Try to hit each key with equal velocity, so the chances of causing a pop sound are the same for each one. If the popping sound only occurs when the keys are depressed, the problem is isolated to the keys. Typically, a key-related popping sound is linked to the contact strip or key weight. If your organ has weighted keys, such as the Kurzweil SP2, and the key weights slip out of the key, moving the key can create a popping sound as the key weights hammer against the contact strip.

4. Dismantle the organ. The exact process for doing so varies according to make and model, but you typically need to unscrew the back and top panel to expose the interior workings and, where applicable, the amplifier.

5. Inspect the moving parts first. Look for loose connections between draw bars and potentiometers. Look for obstructions, such as slipped key weights that may be touching parts of the key assembly that they shouldn't. If your organ has an integrated amplifier and speakers, such as the A 100, look for rips in the speaker cone. A ripped speaker cone flaps when engaged, which can cause a loud popping sound.

Tips & Warnings

• Dismantling your organ may void the warranty.

References

• Benton Electronics: Servicing the Hammond B3 Type Pre-mp
• Hammond B3 and Leslie Tips: B3 Service Manual
• Kurzweil: SP2 Stage Piano