2. GETTING STARTED
7
Fig. 3. Internal Details and Amplifier Input Polarity Switch.
Moving one jumper location from the edge of the board toward the center selects negative or
positive bias. The jumpers closest to the edge of the high-voltage power supply board select
positive voltage; the jumpers toward the center select negative voltage.
5. There are two ways to move the BSB. The easiest way for most people is to place the index
finger of each hand on the ends of the BSB and lift up about one centimeter until the jumpers
clear the board. Move the BSB to the correct set of jumpers and position the jumpers into the
high-voltage power supply board. The BSB can then be completely reseated by pressing
down from the top with your fingertips.
Alternatively, the BSB can be lifted and moved using tools. Two electronics-type needlenose
pliers, one held in each hand, can be used to grip the BSB near each end. Lift and move to
the required jumper position, then position the jumpers with a
gentle
downward pressure.
Press the BSB completely into place using either the pliers or your fingertips, as above.
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