This is aTechnics SU-C01 Stereo Preamplifier, designed for high-fidelity audio reproduction. Type Stereo Preamplifier. Model Technics SU-C01. Phono Input Sensitivity / Impedance MM: 2.5 mV / 47 kΩ. THD (20Hz–20kHz) Phono MM: 0.005% (3 V output).
eBay