| 1. | A tetrode's plate and screen grid voltage is modulated via an audio transformer.
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| 2. | In an ECO, The screen grid acts as a plate for the triode oscillator.
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| 3. | Limits to screen grid dissipation, in addition to plate dissipation, are listed for power devices.
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| 4. | The screen grid may also generate considerable heat.
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| 5. | The negative resistance of the screen grid cancels the positive resistance of the tuned circuit, causing oscillations.
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| 6. | However, because the screen grid is not designed to handle high power, the oscillator's output power is limited.
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| 7. | When a tetrode or pentode is used, the screen grid voltage is usually about one-half the plate voltage.
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| 8. | An important part of the neutralization of a tetrode or pentode is the design of the screen grid circuit.
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| 9. | Some of the electrons pass through the screen grid to the plate, causing a current to flow in the load.
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| 10. | This means the screen grid has negative differential resistance with respect to the cathode, and can be used to create oscillations.
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