Apart from all the obvious suggestions here (environment, cabling, power supply etc.) - as far as the guitar itself is concerned, I've had great results by using adhesive copper foil - on SCs, HBs and even P-90s (to a certain extend).
IMHO it is important to shield all the cavities, starting with the P/U cavities, the electronics bay obviously and not forgetting (on a LP style type) the selector switch cavity. In each cavity, one should solder the pieces of copper used together - few drops of solder should be sufficient for each foil connection - to achieve consistent grounding.
Most importantly, all shielded cavities must be connected and ultimately soldered to (preferrably a central) ground - typically the backside of a pot. I am using insulated wires that runs from cavity to cavity to grounding pot.
In the electronics compartment, I shield the bottom and the walls as well as the backside of the cover.
Make sure that your bridge grounding is still intact (lose or broken wire etc.)
Some people say shielding influences your tone but not only can I not detect that but more so the advantages (e.g. no additional hum when not touching the strings) by far outweigh any potential minor tone degradations.
IMHO it is important to shield all the cavities, starting with the P/U cavities, the electronics bay obviously and not forgetting (on a LP style type) the selector switch cavity. In each cavity, one should solder the pieces of copper used together - few drops of solder should be sufficient for each foil connection - to achieve consistent grounding.
Most importantly, all shielded cavities must be connected and ultimately soldered to (preferrably a central) ground - typically the backside of a pot. I am using insulated wires that runs from cavity to cavity to grounding pot.
In the electronics compartment, I shield the bottom and the walls as well as the backside of the cover.
Make sure that your bridge grounding is still intact (lose or broken wire etc.)
Some people say shielding influences your tone but not only can I not detect that but more so the advantages (e.g. no additional hum when not touching the strings) by far outweigh any potential minor tone degradations.
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