Characteristics of a vacuum tube operating...

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Question 1 of 20kwPQIo3dxVxDODqTS2xF

Characteristics of a vacuum tube operating as a Class C amplifier:

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Question 1 of 20

kwPQIo3dxVxDODqTS2xF

Characteristics of a vacuum tube operating as a Class C amplifier:

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🔍 Key Concepts

• Class C amplifier conduction angle (how many degrees of the RF cycle plate current flows) • Relationship between efficiency and distortion in RF power amplifiers • How grid drive level and plate current behavior differ between Class A, B, and C amplifiers

💭 Think About

• For Class C, think about whether the tube conducts for the whole cycle, half the cycle, or less than half the cycle. How does that affect the waveshape? • As conduction angle decreases, what typically happens to plate circuit efficiency and to the linearity (distortion) of the output? • Which option best sounds like a highly efficient but very nonlinear RF power amplifier used mainly for CW/constant-envelope modes, not audio?

✅ Before You Answer

• Verify which class (A, B, AB, or C) has maximum linearity and therefore lowest distortion, and which has the highest efficiency but poorest linearity. • Check which answer choice mentions plate current drawn in short pulses or bursts rather than flowing for 180° or 360° of the cycle. • Confirm that the described efficiency range (in percent) matches what you expect for a Class C RF power amplifier.

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Question 1 of 20

Characteristics of a vacuum tube operating as a Class C amplifier:

Low plate circuit efficiency, about 25%; practically no grid driving power; plate current flowing for 360 degrees of each cycle; practically no distortion of the output waveshape

Plate circuit efficiency, about 50-60%; plate current flows slightly more than 180 degrees of each cycle; medium power output

High plate circuit efficiency, up to 80 %; plate current drawn in bursts ; great distortion of output waveshape

None of the above

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Question 1 / 20kwPQIo3dxVxDODqTS2xF

Question 1 of 20kwPQIo3dxVxDODqTS2xF

Characteristics of a vacuum tube operating as a Class C amplifier:

Back

Question 1 of 20

kwPQIo3dxVxDODqTS2xF

Characteristics of a vacuum tube operating as a Class C amplifier:

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed