Does grid current flow in a grid-bias...

Question 1 / 27070jDTUOwZIjoEDOK9AWxaj

Question 1 of 27070jDTUOwZIjoEDOK9AWxaj

Does grid current flow in a grid-bias modulated stage under modulated conditions?

Question 1 of 27070

Does grid current flow in a grid-bias modulated stage under modulated conditions?

🔍 Key Concepts

• Behavior of a grid-bias modulated stage in radio transmitters • What happens to grid voltage and grid current during the positive and negative peaks of an audio-frequency (AF) cycle • How grid current affects the shape (linearity) of the modulation envelope

💭 Think About

• Think about when the control grid is driven more positive relative to the cathode: under which part of the AF cycle does that occur, and what does that allow to flow? • Consider whether the presence of grid current is always bad, sometimes acceptable, or never present in proper grid-bias modulation. • Ask yourself: if grid current flows only during certain parts of the AF cycle, what effect might that have on the waveform—could it change its shape and introduce distortion?

✅ Before You Answer

• Review how a negatively biased control grid normally operates in a vacuum tube and under what conditions it starts to draw current. • Verify what happens to the linearity of modulation when the grid begins to draw current on signal peaks. • Confirm whether both the existence of grid current under certain AF conditions and its potential to cause distortion can be true at the same time.

Question 1 of 27070

Does grid current flow in a grid-bias modulated stage under modulated conditions?

Grid current may exist during the positive porions of the AF cycle

Grid current may cause distortion

A and B

None of the above

Question 1 / 27070jDTUOwZIjoEDOK9AWxaj

Question 1 of 27070jDTUOwZIjoEDOK9AWxaj

Does grid current flow in a grid-bias modulated stage under modulated conditions?

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Question 1 of 27070

Does grid current flow in a grid-bias modulated stage under modulated conditions?