Published at Friday, August 31st, 2018 - 20:27:41 PM. . By Emely Greenfield.
Setting correct pickup height is vital to a good round sound and volume. The standard jazz bass pickup will come with four screws (two on each side). The screws adjust the pickup up and down. On the shafts of each screw are springs. Those springs provide tension which keeps the pickup from falling down to the bottom of the body cavity. The springs also provide upward and downward pressure. When you loosen the screws the tension from the spring pushes up on the pickup allowing the pickup to rise, when you tighten the screws down the springs are compressed and the pickup goes down.
A very important note here is to ground the bridge. If the bridge is not grounded your bass will almost always hum when you are not touching the strings. If you still have hum problems you should also have, or should install brass plates under the pickups, and have them connected to the common ground, usually on the back side of the volume and tone pots. Make sure that these plates do not short out the pickups. You can insulate these plates with electrical tape or some other insulator.
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