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A vacuum-tube circuit in which the input signal is applied between the control grid and ground, and the load is connected between the cathode and ground. Also known as grounded-anode amplifier; grounded-plate amplifier. It has a VERY high input impedance, and a low output impedance. Both properties have useful applications.
Its equivalent in solid state is the emitter follower.

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Q: What is a cathode follower?
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