ED:
How old is the house?

When the wiring was put in for the studio, did they bring a new (or Dedicated) line from the main power panel?

I've made a couple of power transformers for music use, not much to them. all you need is a 20 amp 220 volt transformer that steps the power down to two 110v recepticles, this will run a slug of instruments, any electrician can wire it up, put it in a wooden/metal box leave vents bottom and top. should have a off/on 220v switch and a heavy 220v plug and cord. The 110v recpt. can be flush mounted in the box. Paint it black for effects. HE HE.This rig isolates the instruments from other electrical items and the incoming power, it will also clean up florecent lights and dimmer switches somewhat..

Back to the problem. There may be other equipt? running on the same line, If its a old house, maybe no ground wires on parts of it. Usually the culprit is florecent lights or dimmer switches......Pose

edit: Check to make sure out of all your cables, one unshielded did'nt get used going into a amplifier somewhere.

[This message has been edited by loungelyzard (edited 08-19-2005).]