Double Triode Valves

Sometimes known as thermionic valves, triode valves control the flow of electrical current in one direction and are typically used as amplifiers. Double triode valves are the most common configuration and feature two triodes of the same type contained in one tube.

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What are double triode valves?

A step forward from the basic diode, a triode is an amplifying tube or valve consisting of a heated filament or cathode, an anode and a control grid that are held in a glass container with virtually all its air removed. You can repel or attract electrons to control the flow between the cathode and the anode by applying a potential to the grid.

The triode was the first practical electronic amplifier and helped to make amplified radio technology and telephony possible. A double triode valve – featuring two triodes in one tube - is the most common type available today.

How does a double triode valve work?

Electrons are released into the tube via a process known as thermionic emission, which involves heating the cathode with a current flowing through a thin metal filament. They are able to move freely and are attracted to the positively charged anode, producing a current through the tube.

Triodes are normally “on” when there is zero voltage on the grid. The extent of the current is controlled by applying a voltage; a more negative voltage will repel some electrons to reduce the anode current, and vice versa. This means they can be used for amplification.

What are their common applications?

Following their development in the early 20th century, triodes were commonly used in consumer electronic devices such as radios and televisions until they were gradually replaced by transistors in the 1970s.

Double triode valves today are growing in popularity once again and can be found in high-power radio frequency amplifiers in radio transmitters and industrial heating.
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400V Please note that the Stock level on this page is periodically updated during the day.

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23W 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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38.5 (Dia.) x 115mm Please note that the Stock level on this page is periodically updated during the day.

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98mm Please note that the Stock level on this page is periodically updated during the day.

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38.5mm 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, 25W, 6.3V, 36.5 (Dia.) x 115mm
  • $ 30.74
  • 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, 25W, 6.3V, 36.5 (Dia.) x 115mm
  • $ 14.93
  • 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
  • $ 44.408
  • 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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125mm Please note that the Stock level on this page is periodically updated during the day.

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