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Pickups.
These coils are absolutely wonderful for picking-up all and any electromagnetic radiation, this is what they do best, it's how they work.
Do not play near any transformers, electric motors, fluorescent lighting (incl the new energy-saver bulbs), anything spitting out RF. The computer is probably creating an eddy current in its case. Shielding is futile, it can act as an aerial.
Short of re-designing the computer to break the dielectric coupling betwixt motors, transformers and chassis, there's not much that can be done. Move away, the inverse-square law applies (if it is 1 at 1d then it is 1/4 at 2d and 1/9 at 3d...). However most guitar amps will benefit by raising the transformers off the chassis on a sheet of Paxolin (PCB), the bolts still keep the frames earthed. Better still use an aluminium chassis.
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There's two kinds of people, those that hear the music and those that don't.
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