After suggestions to cure this problem.
I recently purchased a (passive) Warwick Streamer Mk1 fretless bass and it is very susceptible to picking up electrical noise. Setting the tone to anywhere above full treble cut, there is a buzz present and very noticeable. When the volume is turned completely down, there is a quite loud hum - this gets louder when touching the strings. The bass is fitted with MEC pickups if this makes any difference?
I'm guessing the problem is a bad earth somewhere and think I might try replacing all of the controls with an active preamp and see if that cures it. Then again I suppose it could be a break in the earth connection to the bridge, so might check that out first.
Any other suggestions?
Pete.