In part B the tube has its cathode connected to a tap on the coil. The tap is much closer to the lower end than it is to the top. The bottom of the coil is grounded. The top of the coil goes through a capacitor to the grid of the tube. The top of the coil goes through a variable capacitor to ground. There is a resistor from the grid of the tube to ground. The plate goes to B plus.
End of verbal description.