AVS Special Member
Join Date: Aug 2004
Location: sierra ecuadoriana
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About the only thing left to do is try another phono preamp. And get a tt that has a ground wire to run to the phono amp.
But first I'd be contacting both the tt manufacturer and the phono amp company to see if they have a clue.
Custom, one of a kind pair, MJC212 mains, mod PT800 center, PT800 surrounds, SUB1500s. Parasound P7, Citation 19, Parasound HCA2205A, HK AVR3600, Marantz TT, Denon disc player, MacBook Pro w/ DragonFly usbDAC.