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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
buellrider97's avatar
buellrider97
501 posts
 

  Could you eliminate the power ground by using a cheap 2 prong wall adapter. Or use an extension cord to power the TT from another circuit ? 

ditusa's avatar
ditusa
2,002 posts
 

@jereeb Wrote:

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

See here

Mike

jereeb OP
7 posts
 

buellrider97 and ditusa, Thanks for your suggestions. I read the article and several others by PS.

1. The hum is created by the TT R and L interconnects even if the TT is not plugged it. If fact plugging it in or out makes no change.

2. I tried using a 2 prong; no change

3. I plugged everything into a HT Monster Power HTS2000 power strip I had on hand; no change. I tried eliminating the ground prong on the power strip, no change. The only thing that works is disconnecting the R & L signal lines from the TT. 

I can only guess that it is a fault inside the TT wiring.

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