Today, the vacuum tube has evolved to include a complex assembly of plates, grids and heating elements that produce a more efficient part. In 1906, inventor Lee de Forest added a third element to the bulb and found that the resulting triode could be used as both a switch and an amplifier. Fleming added a second metal element to the bulb, thereby creating the first diode, or-to use a name more familiar to guitarists- rectifier. This discovery, named the Edison Effect, remained a minor phenomenon until another scientist, John Fleming, found that these electrons could be used to detect radio waves and convert them into electricity. He then sheathed the filament in a glass bulb and extracted the oxygen, thus creating a vacuum to prevent the filament from burning up.ĭuring further experiments in 1883, Edison detected electrons flowing from the filament, through the vacuum and over to a metal plate he had placed inside the bulb. And then pay your respects to Thomas Edison, the Wizard of Menlo Park, New Jersey.Įdison produced an incandescent light bulb in the late 1870s by feeding an electric current to a filament until it burned bright red.
What is a vacuum tube? - If the link between a light bulb and a raging Marshall stack doesn’t seem obvious, take a glance at those vacuum tubes glowing inside your amp.
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