Vacuum Tubes

Vacuum tubes are a type glass tube device, which has had its gas removed, creating a vacuum space. It is comprised of electrodes that are designed to control electron flow between the electrodes sealed inside the vacuum tubes. Unlike transistors, these tubes can be easily replaced by the user.

How do vacuum tubes work?

Vacuum tubes utilise a principal called thermionic emission in which a metal is heated allowing the electrons to be loosened up. This causes the positively charged anodes to attract the negative electrons emitted by the cathodes by causing an electric current to flow into the anode and out of the cathode.

An advantage of vacuum tubes is that they have a wider dynamic range than transistors circuits. This is mainly attributed to their higher operating voltages and overload tolerances.

Types of vacuum tubes

There are a variety of vacuum tubes available such as;

  • Diodes - One of the simplest forms of vacuums tubes available. The tube comprised of two terminals that include both an anode and a cathode.
  • Triode - Triode vacuum tubes have electric current flow generates a high potential from the anode to the cathode's ground potential.
  • Tetrode - This type of vacuum tubes composition includes a fourth terminal that is also known as the screen that is between the anode and the grid. This screen is designed to reduce the capacitance emitted.
  • Pentode - This type of vacuum has a fifth electrode known as a suppressor that is designed to prevent the emission of electrons caused by stimulation of secondary electrons from the anodes.

Applications of Vacuum tubes

Vacuum tubes have a wide range of application in electronic type devices such as;

  • Resistance coupled voltage amplifiers
  • High-end audio equipment
  • Phase inverters
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RS PRO Pentode Thermionic Valve, Octal Base, 42W, 6.3V, 52 (Dia.) x 125mm
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RS PRO Pentode Thermionic Valve, Octal Base, 42W, 6.3V, 52 (Dia.) x 125mm
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RS PRO Pentode Thermionic Valve, Octal Base, 42W, 6.3V, 52 (Dia.) x 125mm
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RS PRO Double Triode Thermionic Valve, B9A Base, 2.5W, 12.6V, 22.5 (Dia.) x 57mm
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RS PRO Pentode Thermionic Valve, Octal Base, 25W, 6.3V, 36.5 (Dia.) x 115mm
  • € 38.00
  • 1 Set
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- 8 Please note that the Stock level on this page is periodically updated during the day.

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RS PRO Pentode Thermionic Valve, Octal Base, 25W, 6.3V, 36.5 (Dia.) x 115mm
  • € 18.43
  • 1 Set
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RS Pro Please note that the Stock level on this page is periodically updated during the day.

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Check Stock Levels 1.5A Please note that the Stock level on this page is periodically updated during the day.

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6.3V Please note that the Stock level on this page is periodically updated during the day.

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800V Please note that the Stock level on this page is periodically updated during the day.

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25W Please note that the Stock level on this page is periodically updated during the day.

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Octal Please note that the Stock level on this page is periodically updated during the day.

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- 8 Please note that the Stock level on this page is periodically updated during the day.

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36.5 (Dia.) x 115mm Please note that the Stock level on this page is periodically updated during the day.

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36.5mm Please note that the Stock level on this page is periodically updated during the day.

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RS PRO Pentode Thermionic Valve, Octal Base, 25W, 6.3V, 36.5 (Dia.) x 115mm
  • € 75.89
  • 1 Set
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RS Pro Please note that the Stock level on this page is periodically updated during the day.

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Check Stock Levels 1.5A Please note that the Stock level on this page is periodically updated during the day.

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6.3V Please note that the Stock level on this page is periodically updated during the day.

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800V Please note that the Stock level on this page is periodically updated during the day.

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25W Please note that the Stock level on this page is periodically updated during the day.

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Octal Please note that the Stock level on this page is periodically updated during the day.

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- 8 Please note that the Stock level on this page is periodically updated during the day.

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36.5 (Dia.) x 115mm Please note that the Stock level on this page is periodically updated during the day.

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100mm Please note that the Stock level on this page is periodically updated during the day.

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36.5mm Please note that the Stock level on this page is periodically updated during the day.

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115mm Please note that the Stock level on this page is periodically updated during the day.

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RS PRO Pentode Thermionic Valve, Octal Base, 42W, 6.3V, 52 (Dia.) x 125mm
  • € 54.86
  • Each (In a Box of 20)
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RS Pro Please note that the Stock level on this page is periodically updated during the day.

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Check Stock Levels 1.6A Please note that the Stock level on this page is periodically updated during the day.

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6.3V Please note that the Stock level on this page is periodically updated during the day.

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800V Please note that the Stock level on this page is periodically updated during the day.

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42W Please note that the Stock level on this page is periodically updated during the day.

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Octal Please note that the Stock level on this page is periodically updated during the day.

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- 8 Please note that the Stock level on this page is periodically updated during the day.

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52 (Dia.) x 125mm Please note that the Stock level on this page is periodically updated during the day.

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110mm Please note that the Stock level on this page is periodically updated during the day.

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52mm Please note that the Stock level on this page is periodically updated during the day.

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