Noisy electronics/pickups, help please!!!

[BassCrazi]

I have an Ibanez Prestige SR1005EFM with Bartolini pickup. The tone is awesome, however if I put the treble up I get a horrible osculating interference in the amp. The problem is worse if I increase the balance to the neck pickup. If I change my position/stance in relation to the amp, the noise either increases or decreases as well so there definitely seems to be interference from the pickup or electronics with the amp. I have tried different cables and amp and the problem persists. The real problem with this is that when I play at venues where the sound is setup by independent sound company (i.e. we don't use our own rig), the sound engineers complain about the noise, which has to be "e.q.ed" out at the desk. Any idea on how to combat this irritation?

[Bloodhammer]

Mabey you have a ground loop in the guitar. I wouldn't know how to fix it, though. Just a thought

[BassCrazi]

In case anyone else has a similar problem, I took it into the shop for repairs. The techie replaced a ribbon inside the head unit which was causing a grounding problem and it is almost quite now. I don't know what the ribbon is called but there can't be too many of them in there...