PSAudio Stellar Phono PreamplifierNoise is the real engineering challenge in a phono stage. The signal coming off a cartridge is measured in millivolts. By the time you've amplified it to line level, any noise in the gain stage has been amplified right alongside it. PS Audio's approach is a separate regulated power supply. The power transformer is physically removed from the signal chain, and the supply rails are cleaned before the audio circuit ever sees them. The result is a stage