THE modern thermionic valve has now become of world-wide importance, not only in connexion with radio broadcasting, but also in its many applications in scientific and commercial instruments, and in ...

So rapid have been the advances made in radiotele-graphy and radio telephony that the author has found it necessary to rewrite much of the first edition of this useful book. The invention of the ...

What an interesting thing – a new take on thermionic valves for the audio obsessed, base on vacuum fluorescent display technology. According to RS Components, which is stocking the Korg Nutube 6P1 ...

I came across this excellent detailed video, describing how Mullard thermionic valves were made. Well worth a look – for example, at Mullard tungsten ore was bought in and converted to metal and then ...

This lovely little number is the EF80 pentode thermionic valve, or vacuum tube, made by Mullard beginning in 1950. They were used in radio and radar applications, but most of them wound up in VHF ...

A Spanish-Italian research group has developed a solid-state thermal-to-electric energy converter based on hybrid thermionic-photovoltaics (TIPV) for different applications. It consists of a ...

WHEN the transistor exploded on the scene half a century ago, it seemed to sound the death knell for the thermionic valve or vacuum tube. Transistors, like valves, can amplify an electrical signal, ...

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When a metal is heated to a sufficiently high temperature, electrons can be ejected out from the surface in a process known as the thermionic emission, a process that is similar to the evaporation of ...