2. amps-preamps
  3. 1099866598

Problem with line noise from Phono preamp

I'm hoping someone has had experience with this problem and can help me: I've been trying to connect my turntable to my B&K AVP3090 preamp using use an outboard phono preamp. I've tried 2 different outboard phono pre's with the same results - they play ok, but there's a very noticable AC line noise issue.

The 2 units in question are a Rolls VP129 tube phono pre, and a Music Hall MMF Phono Pack. Both units are powered by similar 12V AC power transformer.

My turntable works fine through my Rotel RC1070 (which I sold recently), and when I connect it to the B&K through an old Adcom GFP-1 preamp.

Can anyone help with this? thanks in advance.
bdgregory

Showing 1 response by jfrech

jfrech's avatar
jfrech
1,816 posts
 
Sounds more like a grounding issue. Do you have a ground wire from the tonearm to phono stage?

I'm not a expert on this. I hope someone else chimes in on how to trouble shoot this.

If I the ground wire off, I get the same result.
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