What is a characteristic of a grounded-grid amplifier?
High power gain
Low input impedance✓Correct answer
High electrostatic damage protection
Low bandwidth
Explanation
In a grounded-grid stage the drive is applied to the cathode, so the source works into the cathode circuit and sees a low impedance, typically tens of ohms. Power gain is comparatively low because the drive power passes through to the output, and the bandwidth is wide rather than narrow.