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The plate, or anode, of a tube is a cylinder concentric with the cathode and filament (Fig. 29-2). The plate is connected to the positive dc supply voltage. Tubes typically operate at about 50 V to more than 3 kVdc.
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29-2 Construction of diode tube. For clarity, electrodes are shown transparent. Actually they are opaque metal.
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Because the plate readily attracts electrons but is not a good emitter of them, and because the exact opposite is true of the cathode, a diode tube works well as a rectifier for ac. Diode tubes can also work as envelope detectors for AM, although they are no longer used for that purpose.
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The triode
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In a diode tube, the flow of electrons from cathode to plate depends mainly on the dc power supply voltage. The greater this voltage, the greater the current through the tube. The flow of current can be controlled by means of an electrode between the cathode and the plate. This electrode, called the control grid, is a wire mesh or screen that lets electrons physically pass through. But the control grid (also called simply the grid) interferes with the electrons if it is provided with a voltage that is negative with respect to ground. The greater this negative grid bias, the more the grid impedes the flow of electrons through the tube.
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542 Electron tubes A tube with a control grid, in addition to the cathode and plate, is a triode. This is illustrated schematically in Fig. 29-3. In this case, the cathode is indirectly heated; the filament is not shown. This omission is almost standard in schematics showing tubes with indirectly heated cathodes. When the cathode is directly heated, the filament symbol serves as the cathode symbol.
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29-3 Schematic symbol of triode tube. The filament is not shown.
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Now perhaps you see the resemblance between a triode tube and an N-channel FET. The cathode is analogous to the source; the grid is analogous to the gate; the plate corresponds to the drain. The only major differences, in fact, between the triode tube and the N-channel FET are that the tube is constructed differently, and the tube works with much higher voltages. In a tube amplifier, the control grid is where the signal input is normally applied. A triode amplifier or oscillator circuit looks just like an FET circuit, except that the tube plate and grid bias voltages are far greater than the FET drain and gate voltages.
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Extra grids
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Many tubes have multiple grids. These extra elements allow for improved gain and stability in tube type amplifiers.
The tetrode
A second grid can be added between the control grid and the plate. This is a spiral of wire or a coarse screen and is called the screen grid or screen. This grid normally carries positive dc voltage, roughly 1/4 to 1/3 that of the plate voltage. The screen grid reduces the capacitance between the control grid and plate, minimizing the tendency of a tube amplifier to oscillate. The screen grid can also serve as a second control grid, allowing two signals to be injected into a tube. This tube has four elements and is known as a tetrode. Its schematic symbol is shown at A in Fig. 29-4.
The pentode
The electrons in a tetrode can strike the plate with extreme speed, especially if the plate voltage is high. The electrons might bombard the plate with such force that some of them bounce back or knock other electrons from the plate. Imagine hurling a baseball into a
Extra grids 543
29-4 At A, a tetrode tube. At B, a pentode; at C, a hexode; at D, a heptode.
bushel basket full of other baseballs. If you throw the ball hard enough, some of the other balls might be jostled out of the basket. Many of these electrons end up leaking out through the screen grid, rather than going through the plate circuit of the tube. The result is diminished plate current and increased screen current. Because it s the plate current that produces the output signal for the tube, this secondary emission hinders the performance of the tube. If secondary emission is extensive, it can cause screen current so high that the screen grid might be damaged. The problem of secondary emission can be dealt with by placing yet another grid, called the suppressor grid or suppressor, between the screen and the plate. The suppressor also reduces the capacitance between the control grid and the plate still more than is the case with the tetrode. Greater gain and stability are possible with a pentode, or tube with five elements, than with a tetrode or triode. The schematic symbol for a pentode is shown at B in Fig. 29-4. The suppressor grid is generally grounded, or connected directly to the cathode. It, therefore, carries a negative charge with respect to the screen grid and the plate.
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