Figure 4B.8. There are 4 triodes all in a row. We will number them from left to right, 1, 2, 3, and 4. Below them are two more triodes which we will number, 5, and 6. The cathodes of triodes 1, 2, and 5, are tied together and go through a resistor to one end of the lower pot. The wiper is grounded. In like manor the cathodes of triodes 3, 4, and 6, are tied together and go through a resistor to the other end of the lower pot. Cathodes 1, 2, and 5, go through a resistor to cathodes 3, 4, and 6. The grids of triodes 1 and 4 are tied together and go through a resistor to ground. These grids also connect to the upper input terminal. The grids of triodes 2, and 3, are tied together and go through a resistor to ground. These grids also go to the second input terminal. The plates of triodes 1 and 3 are tied together and go through a resistor to one end of the upper pot. The wiper goes to B plus. Plates 1 and 3 also go to one of the output terminals. Triode plates 2 and 4 are tied together and go through a resistor to the other end of the upper pot. Plates 2 and 4 also go to the other output terminal. The grid of triode 5 goes through a resistor to ground. The grid also goes to the third input terminal. The grid of triode 6 goes through a resistor to ground. This grid also goes to the fourth input terminal. The plates of triodes 5 and 6 go to B plus. End of verbal description.
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