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NAD C740

After relocating NAD C40 with a Gemini pre-amp I receive feedback when connecting Technics turn table to Aux on NAD. My initial thoughts are it is the Gemini output as it is only the "right" input jack connected to the NAD. Any thoughts on what might be the issue? Since the NAD does not support Phono directly I need the pre-amp. Otherwise it appears the NAD is working when connected to CD. Thanks to all.

Re: NAD C740

Possible bad connection at NAD or Gemini RCA jacks. Not sure what you mean by 'Feedback'; are you using the ground connection for the phono at the Gemini?