2. amps-preamps
  3. 157213-119652

Determining the Source of Noise when TT is On

I can use a hand.  I have a scratchy noise coming out of my left front speaker whenever I have my TT on.  The sound is on without the TT turning.  The noise started about a month ago long after I had installed the component parts.  The TT is grounded.  I have a relatively new phono pre-amp MP 1100 with balanced cables going to a 5 yo MX 121 a/v control.  When I disconnect the left cable from the back of the phono pre-amp the noise stops.  Q: how can I determine if the defect is in the phono pre-amp or the a/v controler?  
normantaylor

Showing 3 responses by normantaylor

normantaylor OP
51 posts
 
Stereo5
I would not know how to check for a cable problem.  I have wiggled connections and it did not make a difference.

petg60
Yes, the MC 1100 phono pre-amp has tubes.  I'll give that a try.  I will also switch the cables to rule that out.  Thank you.  
normantaylor OP
51 posts
 
Excellent guidance.  Thank you!

normantaylor OP
51 posts
 
I did the cable test switching connections in the back of the av control.  The noise changed speakers.  I already put a call into my dealer from whom I purchased the balanced cable a few months ago.  Thanks for the help and direction gents.  You all saved me major headaches and $.  Great forum!
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