About this item:

• Pure Tube-Amplification: The GR70 headphone tube amp combines vintage charm with modern tech, delivering authentic tube essence. Perfect for headphone enthusiasts, it pairs excellently with over-ear and in-ear headphones for superior audio
• Quad Tubes: Features two 5654W and two 6AC7 vacuum tubes （or 6Ж4) for two-stage amplification. The 5654W tubes boost voltage, while the 6AC7 tubes handle power amplification. This setup delivers balanced, transparent, and textured sound
• User-Friendly Design: This tube headphone amp preamplifier offers intuitive controls, including a large volume knob, dual-side ventilation holes, bass & treble controls, high and low impedance mode switching, making it versatile enough
• Two-in-One: It supports low and high impedance modes switching to adapt 16Ω-300Ω headphones, and features 6.35mm/3.5mm headphone jacks on the front and RCA Input/Output on the rear for home audio HiFi system integration
• Compact Yet Powerful: Crafted with a CNC-machined aluminum alloy body, the GR70 is both durable and refined. Despite its compact size, it delivers up to 300mW power output and 1.2V RCA output with SNR ≥97dB—offering warm, clean, and dynamic sound

Specification:

• Input: RCA
• Output: RCA, 6.35mm headphone jack, 3.5mm headphone jack
• Rated power: Low gain: 67mW/320; High gain: 830mW/320
• Headphone impedance: Low impedance mode: 16Q-120Q; High impedance mode: 120Q-300Ω
• Frequency response: 20Hz-20kHz(±1dB)
• Signal-to-noise ratio: 97dB
• Dynamic range: 97dB
• Distortion: ≤0.65%
• Noise floor: 18.54uV
• Crosstalk: 82dB
• Power input: DC12V/3A

Package include:

• GR70*1
• 5654W*2
• 6AC7 vacuum tubes*2 (or 6Ж4*2)
• Tube cover*2
• 12V/3A Power supply*1
• Manual *1