A typical hot-cathode thyratron uses a heated filament cathode, completely contained within a shield assembly with a control grid on one open side, which faces the plate-shaped anode.
32.
The triode is biased to Class A operation by applying a suitable negative bias voltage to its input control grid ( see diagram ), or by raising the cathode potential with biasing components.
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When held negative with respect to the cathode, the control grid creates an electric field which repels electrons emitted by the cathode, thus reducing or even stopping the current between cathode and anode.
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This design normally uses a triode so valves such as the 4CX250B are not suitable for this circuit, unless the screen and control grids are joined, effectively converting the tetrode into a triode.
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For a cold-cathode thyratron the trigger voltage on the control grid will typically be positive, and a flash-over from control grid to cathode will initiate the arc discharge in the tube.
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For a cold-cathode thyratron the trigger voltage on the control grid will typically be positive, and a flash-over from control grid to cathode will initiate the arc discharge in the tube.
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In a monochrome receiver the luminance signal is amplified to drive the control grid in the electron gun of the CRT . This changes the intensity of the electron beam and therefore the brightness of the spot being scanned.
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In specified intervals, a sample of the ions is let into the drift chamber; the gating mechanism is based on a charged electrode working in a similar way as the control grid in triodes works for electrons.
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If a third electrode is inserted between the cathode and the anode ( called a control grid ), the flow of electrons between the cathode and anode can be regulated by varying the electric charge on this third electrode.
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When the control electrode is made less negative, electrons from the cathode can travel to the anode because the positive attraction from the anode prevails over the negative repulsion caused by the slightly negative voltage on the control grid.
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