Vacuum Tube
Inventor John Ambrose Fleming
John Ambrose Fleming
Born29 November 1849
Died18 April 1945 | Age 95

John Ambrose Fleming 1904


Sir John Ambrose Fleming ( 1849 – 1945) born in Lancaster, Lancashire, England invented the first thermionic valve or vacuum tube, or just valve as it was known. He received a patent on November 16, 1904.

What they do
Valve diode
Valve diode

Vacuum tubes or thermionic valves are based around the concept of thermionic emission. Using two electrodes enables diodes to be made that can rectify signals.


New Dawn
Flemings early valve
Flemings early valve

The vacuum tube brought the dawn of the age of electronics. Its invention enabled the wireless technology of the day to move forward. The valve was pivotal in laying the foundations of what we call electronics technology today.
This invention made possible or improved:
Sound recording and reproduction
Telephone networks,
Analogue and Digital computers

War Needs
The outbreak of World War 2 was a key point in thermionic valve history. These devices came into their own as they were needed for electronic equipment of all sorts from radio receivers to transmitters, radar sets, electronic warfare equipment, telecommunications repeaters and much more.

Tags: Valve Electronic Tube Thermionic amplification

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In History
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  • 05 February 1790.
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  • 06 February 1804.
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  • 21 February 1741.
    This month 281 years ago the world lost Jethro Tull
  • 10 February 1868.
    This month 154 years ago the world lost David Brewster
  • 19 February 1927.
    This month 95 years ago the world lost Herbert Akroyd Stuart
  • 26 February 1884.
    This month 138 years ago the world lost Alexander Wood
  • 10 February 1912.
    This month 110 years ago the world lost Joseph Lister
  • Christmas Cracker. 200 years ago 18/10/1823 Tom Smith was born
  • 23 February 1965.
    This month 57 years ago the world lost Stan Laurel
  • 08 February 2017.
    This month 5 years ago the world lost Peter Mansfield
  • 17 February 2011.
    This month 11 years ago the world lost Ron Hickman
  • Marshall Amplification. 100 years ago 29/7/1923 Jim Marshall was born
  • 50 years ago in 1973 The first stable LCD is announced to the world.
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