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TUBE CONSTANTS RELATIONSHIPS Constants m, r p, and g m dependent on physical construction of tube and are interrelated: m = r p x g m If two constants ae know, the third can be calculated. Plot shows the three constants corresponding to a single value of plate current. •Amplification factor increases slightly at low plate
emission in vacuum tubes, was then thoroughly investigated even in other countries, mainly to increase the efficiency of light bulbs. In November 1883 Edison applied for a patent on an ‘Electrical Indicator’, a lamp capable of giving remote indication of its operation, just monitoring the current flowing to a metal strip added in the bulb.
How can light (or electromagnetic radiation) travel through a vacuum when there is nothing there to act as a medium, and do so forever in all directions? For example the light coming from a star millions of light years away. Light is observed as traveling at velocity v=c, according to the second postulate of special relativity. But according to ...
Vacuum tubes mostly rely on “thermionic emission” of electrons from a hot filament or a cathode heated by the filament. This type is called a thermionic tube or thermionic valve. The simplest vacuum tube, the diode, contains a hot electron-emitting filament (cathode), and a cold plate (anode). Current can only flow in one direction through the
This is essentially an updated version of "Vacuum Tube Design" below. Intended for internal use only, this book contains 53 "articles" on different aspects of vacuum tube design and manufacture. I think this book has nearly everything you need to know to design and build tubes. Beware, the PDF file is over 150 megabytes!
tube, the pump must make a vacuum with no more than a millionth of the air pressure at sea level (one microTorr, in official technical jargon). The "harder" the vacuum, the better the tube will work and the longer it will last. Making an extremely hard vacuum in a tube is a lengthy process, so most modern tubes compromise at a level of vacuum
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How does light travel? May 20 2016, by Matt Williams ... And how can it behave like a wave and pass through a vacuum, when all ... J.J. Thompson and experiments using cathode ray tubes).
