*Question E7B06:
What is a characteristic of a grounded-grid amplifier?*  

*Correct Answer is  B: Low input impedance*  

### AI Response: (may contain errors)  

A grounded-grid amplifier is a type of vacuum tube amplifier where the grid is connected to ground, and the input signal is applied to the cathode. Here's why the correct answer is "Low input impedance":

1. **Correct Answer: Low input impedance**  
   - In a grounded-grid amplifier, the input is applied between the cathode and the grid (which is grounded). This configuration results in a low input impedance because the input is effectively in parallel with the cathode, which has a low impedance path to ground.

2. **Why the other choices are incorrect:**
   - **High power gain (A):** Grounded-grid amplifiers typically have moderate power gain. They are often used for their stability and ability to handle high power rather than for high gain.
   - **High electrostatic damage protection (C):** This is not a characteristic of grounded-grid amplifiers. Electrostatic damage protection is more related to semiconductor devices and not a typical concern for vacuum tube amplifiers.
   - **Low bandwidth (D):** Grounded-grid amplifiers can have relatively wide bandwidths, making them suitable for RF applications. Low bandwidth is not a defining characteristic.

In summary, the low input impedance of a grounded-grid amplifier is due to the input being applied between the cathode and the grounded grid, which inherently presents a low impedance path.