Grid 4 accepted the incoming signal with the remaining two grids, 3 and 5 connected together ( usually internally ) which acted as screen grids to screen the anode, grid 4 and grid 2 from each other.
32.
Because the grid is negatively charged relative to both the anode and the screen grid, it repels any secondary electrons back to the anode preventing them from contributing to the screen grid current, and to any negative resistance characteristic.
33.
Because the grid is negatively charged relative to both the anode and the screen grid, it repels any secondary electrons back to the anode preventing them from contributing to the screen grid current, and to any negative resistance characteristic.
34.
Another disadvantage was that in spite of the presence of the screen grids, the electron beam, modulated by the oscillator electrodes, still had to pass through the signal grid, and coupling of the oscillator into the signal circuit was inevitable.
35.
This causes a downward " kink " in the plate current vs . plate voltage curve " ( graph below, grey region ) " when the screen grid is biased at a higher voltage than the plate, as described below.
36.
An example of this used at VHF / UHF include the 4CX250B, an example of a twin tetrode would be the QQV06 / 40A . The tetrode has a screen grid which is between the anode and the first grid.
37.
Then a layer of tiny lenses will be added on top of the screen grid : every LCD screen in the grid will be topped with hundreds " of individual lenses, Birch said, although he declined to give the exact number.
38.
Harries is believed to be the first engineer to discover the " critical distance " effect, which maximized the efficiency of a power tetrode by positioning its anode at a distance which is a specific multiple of the screen grid-cathode distance.
39.
The tetrodes were switched on and off by a pair of mercury vapour thyratrons connected to a timing circuit, the output of which biased the control and screen grids of the tetrode positively while a bias signal kept it normally turned off.
40.
As the second grid ( screen grid ) in a tetrode is maintained at a constant potential the equation for the tetrode can be reduced back to that of the triode as long as the screen grid is kept at the same potential.
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