Douk Audio 6J1 Tube Phono Preamp MM RIAA Turntable Vinyl LP Record Player HiFi Class A Preamplifier This is a MM phono preamp which only suits for MM turntables and needs to work with amplifier This phono preaamp sounds like NAIM, and have tube unique flavor, special suit for listen female voice. Mini compact, Gentle euphemism tone.Single-ended, Class A, attenuated RIAA! Input impedance: 47K; Amplification: 28; Maximum output voltage: 3.2V; AC voltage: 18V Size: 60 * 25 * 85 mm / 2.36 * 0.98 * 3.35 in; Net weight: 0.28 Kg / 0.62 lb; Package: 1PC MM phono amp; 1PC power supply