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clip on RF chokes

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papabearjew:
I'm still getting cyclic hum (probably from motor) on my turntable. Any chance that clip on RF chokes on the audio cables would help?
Thx

MacGeek:
PBJ-I doubt it.  Is it the same at all speeds?  Do you have a ground wire from the 'table to the pre-amp?  If not try adding one, or if so, disconnect it.  Sometimes reversing the A/C plug helps.

papabearjew:
@MacGeek. Everything you said to try has been done to no avail. The cycles of the hum does vary with the rpm setting

ataudio:
If its 60/120 hz hum they won't help at all.  Their impedance doesn't rise until well into the RF range. 
Can you borrow an isolation transformer?  Isolate the TT from all other components.

Sir Thrift-a-Lot:
Changes with the speed?   Sorry to tell you, you have the famous "Grado hum".   Paint some copper shielding on your platter or (much quicker and easier) just get yourself an AT or Shure cartridge.   The hum will go away.

http://www.audiokarma.org/forums/showthread.php?t=46091

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