Read through the posts - not sure this test was tried.
Turn everything on system as if ready to play lps. (amp/preamp/phono stage if any /TT).
Put system on mute. Put volume/gain knob at lowest point.
With the platter NOT TURNING lower the needle onto the lead groove of an lp.
Take system off mute and start to slowing turn up volume until the noise is audible.
Now start to move the phono cables slowly . Move them up / down / sideways.
Is there a change to how loud or quiet the noise gets ?
If YES you are getting interference from other sources onto your cables.
See if moving them abit helps.
If not you will have to reposition them or maybe move your TT.
Let me know if this helps.
Cheers Chris
Turn everything on system as if ready to play lps. (amp/preamp/phono stage if any /TT).
Put system on mute. Put volume/gain knob at lowest point.
With the platter NOT TURNING lower the needle onto the lead groove of an lp.
Take system off mute and start to slowing turn up volume until the noise is audible.
Now start to move the phono cables slowly . Move them up / down / sideways.
Is there a change to how loud or quiet the noise gets ?
If YES you are getting interference from other sources onto your cables.
See if moving them abit helps.
If not you will have to reposition them or maybe move your TT.
Let me know if this helps.
Cheers Chris