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Shielding/Grounding a P-Bass


How1
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I’ve been getting a lot of noise from my Precision, so this morning I decided to shield it. I’ve covered the cavity in copper tape and attached a strip from the cavity to under the pickguard which is also shielded. It’s all one cavity, no separate PU cavity. I’ve also checked the bridge wire and added a bit of tape. It doesn’t seems to have made much difference. Do I need a wire going from the ground on the jack socket to the cavity? Or the bridge to the cavity? I’ve done all this once on a different bass and can’t remember exactly what I did.

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On 29/04/2023 at 11:59, How1 said:

I’ve been getting a lot of noise from my Precision, so this morning I decided to shield it. I’ve covered the cavity in copper tape and attached a strip from the cavity to under the pickguard which is also shielded. It’s all one cavity, no separate PU cavity. I’ve also checked the bridge wire and added a bit of tape. It doesn’t seems to have made much difference. Do I need a wire going from the ground on the jack socket to the cavity? Or the bridge to the cavity? I’ve done all this once on a different bass and can’t remember exactly what I did.

 

Yes. The copper shielding needs continuity to the Screen (Ground) connection on the output jack.

The bridge should already be connected to the jack socket screen connection (check it anyway with a continuity tester / DMM).

So cavity to jack socket or to bridge will have same effect in practice.

Without a connection the copper screen is just 'floating' electrically and effects are unpredictable.

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