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).
PS Audio GCPH to loud . Where to go next?
As my system evolves I am realizing that the GCPH makes a lot of noise. It's not hum or anything like that just sort of a sizzle. My system is: almarro a205a ,Cambridge audio Dac magic, Cambridge audio 340c, pro-ject 2 xperience acryl with speed box mkii,Dynavector 17d3 cartridge and the PS Audio GCPH all soon to be feed into my new Tekton Lores.This is where the problem lies. The digital is dead silent when nothing is playing.I understand that I may not equal the silence of the digital but it should come a lot closer than the gcph does. So any suggestions. This will likely be a lateral move as far as price is concerned but I could stretch a little maybe up to the $1500 range.The new phono preamp would need to have enough gain to handle the 17d3