Figure 1, Amplifier or preamp block diagrams. There are three parts to this figure. Part A. The first block on the left is labeled source selector. There are three connections indicated on the left indicating an indefinite number of signal sources being connected. An arrowhead indicates that the source selector feeds into the volume control. The volume control feeds a tube amplifier. The tube amplifier feeds the tone control. The tone control feeds the balance control. The balance control feeds another block labeled tube amplifier. This last block goes to an output terminal.

Part B. The first block on the left is labeled source selector. There are three connections indicated on the left indicating an indefinite number of signal sources being connected. An arrowhead indicates that the source selector feeds into the balance control. The balance control feeds a tube amplifier. The tube amplifier feeds the tone control. The tone control feeds the volume control. The volume control feeds another block labeled tube amplifier. This last block goes to an output terminal.

Part C. The first block on the left is labeled source selector. There are three connections indicated on the left indicating an indefinite number of signal sources being connected. An arrowhead indicates that the source selector feeds into the balance control. The balance control feeds a tube amplifier. The tube amplifier feeds the volume control. The volume control feeds another block labeled tube amplifier. The second tube amplifier feeds the tone control. The tone control goes to an output terminal. End verbal description.
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