Figure 4 eh.13. There are two input terminals on the left. The lower one is grounded and the upper one goes to the grid of a triode. There is a resistor labeled R c connected from the grid to ground. The plate of the triode goes to E b b. The cathode goes through a resistor labeled R k to ground. The cathode also goes through a capacitor to the upper output terminal. The lower input terminal is grounded. End verbal description.