Tetrode
The tetrode is an electron type of Tube in direct evolution of the tube Triode, to which a Grill screen is added. The addition of this grid between the Anode and roasts it of control reduced in very great proportions the capacity between these two elements (g1 and A), which allows an operation higher frequencies. Moreover, as this grid is positively charged compared to the Cathode, that increases the speed of the electron S, thus increasing the profit of the tube. But the more the speed of the electrons increases, the more the effect of secondary emission due to the heating of the anode is felt, introducing a discontinuity into the characteristics running/tension of the tube (effect of negative Résistance). This effect was cancelled in the tube Pentode by the introduction of suppressor a Grid placed between the anode and the grid screen.
Applications
Nowadays, the tetrodes are rare: currently, one quasi exclusively uses them for the high frequencies applications of strong powers such as the transmitters of broadcasting, although in this scope of application, the Triode S are often used.
In the audio applications, one often speaks about tetrode to indicate a Tétrode with beam directed (what is different).
Diagram
Some models
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