I have some nasty distortion that "rides" on top of the notes. Sounds like something is ripping. If I pick the string harder, the distortion sound is more pronounced. It dies out before the note is gone. Seems louder with bass notes. Makes high notes sound shrill. Its happening with all my heads and cabs. But its more noticeable with my '74 and Heritage H30 speakers. The high end of the H30s brings it out more than the Greenbacks or V30s. Could this be an electricity problem? Its the only factor I can think of. Our house was built in the 40s. The wiring sucks. It seems like there isn't enough juice to run everything. My comp screen will flicker when the washing machine runs. Or if my wife vacuums. The lights dimmed a little when the central air came on.