Fosi Audio GR70

Pure tube amplification: The GR70 headphone tube amplifier combines vintage charm with modern technology, delivering authentic tube sound quality. Perfect for headphone enthusiasts, it pairs excellently with both over-ear and in-ear headphones for superior audio performance.

Four tubes: Features two 5654W and two 6Ж4 vacuum tubes for two-stage amplification. The 5654W tubes handle voltage gain, while the 6Ж4 tubes provide power amplification. This configuration delivers a balanced, transparent, and detailed sound.

User-friendly design: This headphone tube preamplifier offers intuitive controls, including a large volume knob, ventilation openings on both sides, bass and treble controls, and high/low impedance switches, making it highly versatile.

Two-in-one functionality: Supports switching between low and high impedance modes to match headphones ranging from 16 Ω to 300 Ω. It features 6.35 mm and 3.5 mm headphone outputs on the front, and RCA input/output on the back for integration into a home hi-fi audio system.

Compact yet powerful: The GR70 is built with a CNC-machined aluminum alloy chassis, making it both durable and refined. Despite its compact size, it delivers up to 300 mW output power and a 1.2 V RCA output with SNR ≥97 dB, ensuring warm, clean, and dynamic sound.