| 1. | A valve can contain more than one control grid.
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| 2. | The circuit that drives the control grid is usually referred to as a grid modulator.
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| 3. | A variation of the control grid is to produce the helix with a variable pitch.
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| 4. | As in the dynatron oscillator the control grid can be used to adjust the negative resistance.
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| 5. | This additional " control grid " modulates the current that flows between cathode and anode.
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| 6. | In the off situation the voltage on the control grid is negative with respect to the cathode.
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| 7. | Moreover, control grids are required in order to adjust the timing of the start of conduction.
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| 8. | A relatively small variation in voltage on the control grid causes a significantly large variation in anode current.
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| 9. | In fact, each tube in VFD is a triode vacuum tube because it also has a mesh control grid.
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| 10. | By placing the control grid closer to the filament / cathode relative to the anode, a greater amplification results.
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