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Hum in my system; its the turntable R and L interconnects. Huh?

Pioneer PL-570 reconditioned turntable

EAR Phono Box

Cambridge Audio Integrated amp

DALI Floorstanders

I have a very pronounced "Hum" in my system, sounds like a 60cycle hum. I tried all the troubleshooting steps; it originates in the EAR, which has just recently been serviced and has new Goldline tubes. But here is the kicker, if I disconnect the R and L TT interconnects the hum cuts out and I get a fine white noise sound of much less volume. The TT produces the hum in the system even if the TT is unplugged from the wall receptacle. Removing the ground wire from the TT to the EAR has no effect. I can place my ear on the EAR case and hear nothing, dead quiet. A fault inside the TT?

jereeb

Showing 2 responses by jeffbij

jeffbij
214 posts
 

@jereeb  -  What cables are you running from the turntable to the phono-pre?  Is it possible that they are picking up the 60Hz hum from one of the power cords, the AC wiring in the wall, close by power suppy, etc.  I had a problem once where I was picking up EM interference from a nearby radio station on the cables from my VPI table and the phono-pre.  I could actually hear the radio program/music.  I switched to a set of shielded cables and it went away.

I've also heard, somewhere a long time ago and I don't remember where, that some Grado cartridges are  susceptible to EMI.  Might be complete bs, but might be possible.

Just a thought.

jeffbij
214 posts
 

@jereeb   If you are also going to try a different TT, I'd also try a different set of cables, ...any different set of cables.  It could be that one or both of the cables were damaged when you unplugged the EAR out or hooked it back in.  (It happens.)

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