The most desirable factor in the choice of a...

Question 1 / 27070aDJ5MEXl2jM2Uj3rlcuY

Question 1 of 27070aDJ5MEXl2jM2Uj3rlcuY

The most desirable factor in the choice of a vacuum tube for a voltage amplifier:

Question 1 of 27070

The most desirable factor in the choice of a vacuum tube for a voltage amplifier:

🔍 Key Concepts

• Transconductance (gm) and what it physically represents in a vacuum tube • How voltage gain of an amplifier relates to tube parameters like gm and load resistance • Effect of output capacitance on frequency response and stability of an amplifier

💭 Think About

• Think about which parameter will make a small change in grid voltage produce a larger change in plate current, and how that affects voltage gain. • Consider whether increasing output capacitance generally helps or hurts high‑frequency performance in amplifiers. • Ask yourself: for a voltage amplifier stage, do we usually want more or less ability to convert input voltage changes into output current/voltage changes?

✅ Before You Answer

• Review the definition of transconductance (gm): current change per unit voltage change at the input. • Recall that the basic small‑signal voltage gain of a vacuum tube stage is approximately proportional to gm × load resistance. • Confirm whether increased tube capacitance tends to improve or degrade the bandwidth and speed of an amplifier.

Question 1 of 27070

The most desirable factor in the choice of a vacuum tube for a voltage amplifier:

A low value of transconductance

A high value of transconductance

High output tube capacitance

None of the above