![]() The beam tetrode design was also undertaken to avoid the patents which the giant firm held on power in Europe. EMI engineers and improved the Harries design with a pair of beam plates, connected to the cathode, which directed the electron streams into two narrow areas and also acted like a to redirect some secondary electrons back to the anode. This design also minimized interference of electrons dislodged from the anode. Harries is believed to have been the first engineer to discover the 'critical distance' effect, which maximized the efficiency of a power, by positioning its at a distance which is a specific multiple of the - distance. ![]() ![]()
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