The Signal Transfer Phono Preamplifier.
The Signal Transfer Stereo Phono Preamplifier is a stand-alone version of the phono system used in the Precision Preamplifier. It offers both moving-magnet and moving-coil inputs, the latter with two gain options for optimal performance. It gives extremely accurate RIAA equalisation, a noise performance that approaches the theoretical limits, and superb linearity.
This version has fully balanced low-impedance outputs and is designed to interface with equipment of the highest performance.
This graph shows the typical RIAA equalisation accuracy. The error is less than 0.1 dB from 100 Hz to 40 kHz.
Please note that the scale is enormously expanded and covers only 1.5 dB. The response rolls off very slowly below 100 Hz due to action of the subsonic filter, but is still accurate to -0.5 dB at 50 Hz.
Measurement system: Audio Precision SYS-2702.