In article ,
sofie wrote:
Some years ago when I was in the pro-audio installation business for an
on the road entertainment company, us installation techs would always
carried about a dozen "u-ground" 3 wire to 2 wire ground adapters in our
tool boxes so the ground could be temporarily "lifted" on various pieces
of gear to eliminate ground loops and the subsequent hum problems.
(don't cut off ground pins on the plugs of equipment) Usually the
problem would originate because remote equipment was on a different
circuit from the breaker box and was located some distance from the main
head-end gear.

Crikey. You'd have been shot in the UK. ;-)

1:1 repcoils are the correct way with balanced pro audio gear. You
*really* shouldn't mess with safety earths.

--
*Why is a boxing ring square?

Dave Plowman London SW
To e-mail, change noise into sound.