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cannot be short-circuited to "earth" by rotation of either volume control.
A radio dealer can supply suitable resistors for a few pence apiece. He may call them "padding-out resistors" if you discuss the circuit with him, but they are just ordinary radio resistors, none the less. They should have about the same resistance as the volume controls: usually between 0-1 and 1 -0 megohm.
Using padding-out resistors sometimes makes the amplifier more prone to hum. A centre-tapped volume control provides a popular alternative free from this defect. The centre tap is on the opposite side of the control from the other three tags. It is connected to the earth lead which is common to the amplifier and one side of each pick-up. Each end of the volume control is connected to the output of one pick-up and the sliding contact goes to the amplifier input. Rotation of the control from one end to another progressively reduces to zero the volume from one pick-up before introducing gradually increasing volume from the second pick-up.
The centre-tapped control is really two volume controls in one. The overall resistance must therefore be double that of the control you normally find satisfactory with each pick-up alone (p. 13).
For a simple fade-over, the centre-tapped control is a very convenient arrangement, since it means there is only one knob to turn. On the other hand, it cannot be used for mixed sound effects from both pick-ups together.
A third alternative overcomes this difficulty by using a separate mixing control. The volume is then adjusted by the control usually present on the amplifier. In this arrangement a resistor is connected across the leads from each pick-up and one end of each resistor is connected to the "earth" of the amplifier. The other side goes in each case to one end of a potentiometer, the sliding contact of which goes to the amplifier input. If you know the resistance of the volume control normally working well with your pick-up, use
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