I've just got an old 90's Ibanez SR800 with P/J pickups and it's great when just using the bridge pickup but on the neck pickup there's a low rumbling, like distant thunder. Adjusting tone or volume doesn't make it go away. Any ideas what this could be? How would I fix it?
Try Shielding the Control and pickup Cavities. It is single coil hum. If you move away from your amp it should stop.