The Fosi Audio GR70 delivers authentic tube amplification through a dual-stage design featuring 5654W voltage tubes and 6Ж4 power tubes, creating warm, transparent sound with exceptional clarity. Its impedance-switching capability accommodates headphones from 16Ω to 300Ω, while dual headphone outputs (6.35mm and 3.5mm) and RCA connectivity integrate seamlessly into any audio setup. The precision-engineered aluminum chassis houses intuitive controls—volume, bass, treble, and impedance selection—enabling quick optimization for your listening preferences. With 300mW output power and 97dB signal-to-noise ratio, this compact amplifier combines vintage tube character with modern engineering, ideal for discerning listeners seeking enhanced headphone performance and system flexibility.