Thermionic Valve Bases

Thermionic valve bases are components involved in the process of heating thermionic valves, which are also known as vacuum tubes. These vacuum tube sockets play a key role in the principle of thermionic emission. Thermionic valve bases come in a range of sizes and specifications – here at RS Components we stock the B9A valve base, which is an 8-pin vacuum tube base. Read on to find out more about thermionic valve bases and how they work.

How do thermionic valve bases work?

Thermionic valve bases help to heat vacuum tubes, and the thermal energy given off causes the cathode to release electrons. When a positive voltage is applied to the anode, the electrons are attracted to the anode and move across the gap in the vacuum tube. This clear path enables a current to be created.

Where are thermionic valve bases used?

Before the creation of the transistor in the 1940s, vacuum tube sockets and the accompanying vacuum tubes were the primary building blocks for any electrical applications at the time. Although the invention of transistors began to change that, thermionic valve bases can still be found in a number of devices.

For example, they are still used in high power RF transmitters, which means they are suitable for MRI scanners, particle accelerators and some microwave ovens. Furthermore, vacuum tubes are still used in some amplifiers, as some musicians prefer the sounds they produce over semiconductor amplifiers.

Get your thermionic valve bases from RS Components

Our B9A valve base is an 8-pin vacuum tube base, suitable for use with 12AU7, 12AX7, 6DJB and many more. We also have thermionic valve base octals, so feel free to browse our range today and pick out the product that's right for your project.
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Part Details Base Type Stock For Use With
B9A Please note that the Stock level on this page is periodically updated during the day.

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Check Stock Levels 12AU7, 12AX7, 6DJ8, 6L13, B329, B339, CV491, CV492, E88CC, ECC82, ECC83 Please note that the Stock level on this page is periodically updated during the day.

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RS PRO, Thermionic Valve Base Octal for 6550, 6CA7, 6P3P, 8-pin vacuum tubes such as EL34, KT88
  • $ 2.672
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Octal Please note that the Stock level on this page is periodically updated during the day.

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Check Stock Levels 6550, 6CA7, 6P3P, 8-pin vacuum tubes such as EL34, KT88 Please note that the Stock level on this page is periodically updated during the day.

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