The Tetra Sans PS phono stage uses two tube-based gain stages with a passive equalization network in between. The gain stage's topology is the Constant-Current-Draw Amplifier [CCDA], whose low distortion, fairly high gain, and low output impedance are desirable attributes in a phono preamp. The CCDA is a compound circuit that holds a grounded-cathode amplifier directly cascaded into a cathode follower. So what; what's so special about this obvious pairing? Its special status lies in the details.
The PS-15 is a new GlassWare power supply kit for tube fanciers. The PS-15 fills a gap: a power supply for those who need a high-voltage power supply with two sets of regulated low-voltage power supplies (usually for powering heaters).