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History of Thermionic Valves


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A history of the development of thermionic valves in the first half of the 20th Century.

Date and Time

31 May 2017 - 19:00-20:30


St Asaph, United Kingdom - icon_popup  (See map)


Organised by the UK - NW:Wales North local network.

About this event

We live in an electronic world, a world dominated by transistors which successfully produced for the first time in the late 1940s. 

Our electronic world started around 1904 with the invention of the thermionic diode by Sir John Ambrose Fleming and the subsequent development of many different types of thermionic valves which provided the opportunity to amplify audio and radio waves as well as providing many other different functions.  

There will be a talk with a demonstration of the operation of a pentode valve (EL34) and a cathode ray tuning indicator using a valve tester.

The lecture will be delivered by David Crawford who is Chairman of Wales North Local Network (IET) and Museum Curator at Wireless in Wales Vintage Radio Museum in Denbigh.


18:30 Refreshments (Tea / Coffee / Cake)
19:00 Lecture
20:30 Close (Approximate time)

Reasons to attend

An opportunity to learn about the development of thermionic valves and how they work with a practical demonstration.



Additional information

The valve tester is a workshop item, please do not touch it whilst it is switched on. High voltages are in use.

Registration information

Please register using the "REGISTER" button.


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