Fosi Audio GR70 Tube Headphone Amp Preamp.

Integrating Vintage Charm with Modern Precision

The GR70 is a two-in-one headphone amp and preamp. Easily integrate this tube preamp into your home audio system with its multiple headphone jacks and RCA input/output options.

• Input: RCA; Output: RCA, 6.35mm/3.5mm Headphone Output;
• Max Power Output: 300mW@32Ω; Power Input: DC 12V/3A;
• Headphone Impedance: Low Mode: 16Ω-120Ω, High Mode: 120Ω-300Ω

Description

• 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 6Ж4 vacuum tubes for two-stage amplification. The 5654W tubes boost voltage, while the 6Ж4 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

What‘s in the box？

• GR70 Main Unit *1
• 6AC7 Vacuum Tubes *2
• 5654 Vacuum Tubes *2
• Tube Protection Covers *2
• 12V/3A Power Supply *1
• User Manual

• Manufacturer : Fosi Audio