grado reference statement hum

woo hoo mu metal works.....thanks all

Hum on my the statment (when the arm moves closer to the motor) completely gone when ac motor was replaced by dc motor. Magnetic filds are night mare for grados. ph-1 is also very sensitive and did not like any heavy electric powers (transformers, wires) around.

Magnetic shielding is nothing like electric field shielding. In this case, it sounds liek magnetic. Aluminum foil will probably have no effect.

jh

Sorry for error, I had in mind electric fields. However the Statement is dead quiet now.
lp

Hey Tom,where are you?
This 'aint over ;)