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Thread: blend Pot problem
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16th July 2009, 09:12 PM #1GOLD MEMBER
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blend Pot problem
I am making a bass, and seem to have a problem with the blend pot. Just wondering what I am doing wrong. There are 2 pickups into the blend pot, then on into volume and an EMG preamp. The pickups are passive Bartolini's. I am playing into a tuner rather than an amp at the moment, so I can see whether a signal is present, but can't hear it. What is happening is this: in one side of the pot, one pickup works, but not at all the other side, and vice versa. Right at the centre detent neither one works. The pot is a Stewmac one, and both pickups are supposed to be full in the middle. Both pickups are wired the same (green wire to the shield and grounded, red and white wire soldered together and insulated from everything else, black wire for signal hot. That should give me series wiring on both according to Bartolini. The pot is wired with the criss-cross (ie, outer connections on each gang of the pot cross to the opposite side on the other gang. One criss cross is ground, the other is the output to the volume. Each pickup goes to a separate gang in the middle connector. The behaviour of dropping out in the middle is the same whether one or both pickups are connected to it. Can anyone help?
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PeterThe other day I described to my daughter how to find something in the garage by saying "It's right near my big saw". A few minutes later she came back to ask: "Do you mean the black one, the green one, or the blue one?".
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16th July 2009, 10:06 PM #2GOLD MEMBER
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Fixed it. Clearly a Bartolini blend pot and a Stewmac blend pot are constructed differently. If you have a Stewmac pot, you need to follow the Stewmac wiring diagram, not the Bartolini one (and probably vice versa. The ground and the output wires are exchanged in the two wiring diagrams, and that fixed it fine.
The other day I described to my daughter how to find something in the garage by saying "It's right near my big saw". A few minutes later she came back to ask: "Do you mean the black one, the green one, or the blue one?".
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