Repair - Armstrong, Sykes and Dennis Lighting

Whistling bulbs

Why do some bulbs whistle before they fail? In fact, the filament breaks while the bulb is alight, but it stays alight because electricity arcs over the gap. It is the arc that emits the high-pitched whistle.

  1. Glass light bulbs are passed in front of aflame to heat and soften the neck, which is squeezed to the size of metal fitting and then trimmed.
  2. The still red-hot base of the bulb is then fused to the glass stem which holds the coiled-wire filament.
  3. Finally, contacts at the base of the ´┐Żbulb are soldered to the wires leading from the filament.

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