GR70 Tube Headphone Amp Preamp, Authentic Tube-Amplification with Vacuum 5654W*2 & 6AC7*2, Mini HiFi Preamplifier for Home Audio, 3.5mm & 6.35mm Jacks Supporting 16-300 ohms Impedance

Pure Tube-Amplification: This headphone tube amplifier merges classic appeal with contemporary technology, providing genuine tube character. Ideal for headphone aficionados, it matches superbly with over-ear and in-ear headphones for exceptional audio.
Quad Tubes: It incorporates two 5654W and two 6AC7 vacuum tubes for two-stage amplification. The 5654W tubes enhance voltage, while the 6AC7 tubes manage power amplification. This configuration produces balanced, clear, and detailed sound.
User-Friendly Design: This tube headphone amplifier preamplifier provides straightforward controls, featuring a large volume knob, dual-side ventilation ports, bass and treble adjustments, and high and low impedance mode selection, ensuring adaptability.
Two-in-One: It accommodates low and high impedance mode selection to suit 16-300 headphones. It includes 6.35 mm and 3.5 mm headphone jacks on the front and RCA Input/Output on the rear for integration into home audio HiFi systems.
Compact Yet Powerful: Constructed with a CNC-machined aluminum alloy chassis, it is both sturdy and elegant. Despite its small form, it provides up to 300mW power output and 1.2V RCA output with SNR 97dB, delivering warm, pristine, and dynamic audio