Well I spent a good bit of time listening to the Shanling PH3000 at work because I believe this review needs to be given an asterisk. I was surprised at the mention of a lot of tube noise. I brought in my recabled K701's since that is the only one of the phones used in the review that I have. Result: Absolutely no noise and no hiss detectable, even with the volume turned up to max (with no music playing obviously). This was also the result with my recabled Denon D2000 and Alessandro MSPro's. My guess is that the tubes may need to be reseated or there is a bad tube. It could also be that the Shanling has a crappy PSU. Since this is at work in a biology building with lots of compressors and motors on the circuit, I have everything plug into my BPT custom balanced power unit. I subsequently plugged everything into a cheap power strip which went directly into the wall. With that there was some detectable noise when I maxed the volume control. I could not detect any significant noise increase at my normal listening levels so I don't think the Shanlings PSU is likely contributing significantly to the hiss. I would suggest that a tube swap may be in order, perhaps by whoever has the Shanling now.
Associated equipment was a Pop/Pulse USB/Spdif converter connected via AES/EBU to an Apogee Mini/DAC connected via XLR/RCA to the Shanling. All being fed FLAC files from my workstation.