Figure 4 eh.14. Small signal model of a triode cathode follower. There are two terminals on the left, the top one is labeled G for grid. The bottom one is not labeled. The two are labeled collectively V in. The top one G is marked with a plus sign and the bottom one with a minus sign. The bottom terminal goes to ground. Between the two terminals and set to the right a little is a reference point labeled K. There is a minus sign next to this point. There is an AC voltage generator labeled minus mu V gk. The bottom end of this generator connects to the point labeled K. The lower end is marked with a minus sign. The upper end of the generator is marked with a plus sign and goes to the left end of a resistor labeled r p. The r is lower case. The right end of the resistor connects to a terminal labeled P. The resistor is marked with polarity with plus on the left and minus on the right. There is an arrow indicating that I b is flowing to the right in r p. Directly below the P terminal is another one labeled K. It connects back to point K and the bottom of the generator. A resistor labeled R k connects from the K terminal to ground. An arrow indicates that a current I b is flowing upward in R k. R k is also marked with polarity with the top being negative and the bottom being positive. The P terminal connects to ground. There is a set of output terminals. The top one connects to the K terminal and top of R k. The bottom one connects to ground. They are labeled collectively, V o. The upper output terminal is marked with a plus sign and the bottom one minus. End verbal description.

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