The amp is a GD 10 SE, and I trying to connect my Graham Slee Phono Pre amp to it. The GD is a Amp/Dac with three inputs, all digital each one being a single socket, different types obviously. The Phono Pre has left and right outputs. I tried the digital coaxial out put from my Cd Player to the GD and it works, the headphones sound great, but no luck with the phono stage. Are the output from the phono incompatible, I can not get any sound at all through the headphones. Tried different cables,stereo/ mono, no go. Do I have to get the GD fitted with new inputs? Help!,....Cheers,...Bugs