Did you buy it used? I'm asking because, if you have a warranty; it needs to go back to PS. I'm using a GCPH, with a 17D3, in my system now. I've modded the GCPH, but- at the worst; it only has a VERY slight 60Hz hum, at the highest gain setting, full volume on the pot and 99.9 on my TacT 2.2X volume control. I'm searching for either a Silvercore MC or Auditorium 23 transformer, to get away from even that(though it's barely audible, at my listening position). Have you tried unplugging the interconnects from your TT, to see if the noise is still there? It's possible that they are picking up noise/interference from the TT motor, or elsewhere. Also- It's important that the GCPH be located away from any other sources of EMI/RFI(it's not well shielded, in stock form).
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