The GR70 headphone tube amplifier combines vintage charm with modern technology, offering authentic tube essence. Perfect for headphone enthusiasts, it pairs excellently with over-ear and in-ear headphones, delivering superior sound. The GR70 features two 5654W and two 6AC7 vacuum tubes for two-stage amplification. The 5654W tubes increase the voltage, while the 6AC7 tubes handle the power amplification. This setup provides balanced, transparent, and structured sound. The tube headphone amplifier offers intuitive controls, including a large volume knob, dual-sided ventilation openings, bass and treble controls, and a switch for high and low impedance modes, making it extremely versatile. Crafted with a CNC-machined aluminum alloy casing, the GR70 is both durable and refined. With its compact size, it delivers up to 300 mW of output power.