In article ,
Andy Evans wrote:
The thermionic valve is one hundred years old this week. Happy Birthday

Hello Don - very interesting! Can you elaborate on what exactly happened
100 years ago?

It arrived from an attempt to find out why carbon filament bulbs running
on DC got blackened more on one side than the other. A metal plate was
introduced to attempt to investigate/cure this, and it was noticed that
current was flowing from it.

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*I'm not your type. I'm not inflatable.

Dave Plowman London SW
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