Equipment
Music
Fosi Audio - GR70 Tube Headphone Amp (Orange)
Full Details
Warm, Smooth, Textured Tube Sound Made Affordable: Pint-Sized Fosi Audio GR70 Headphone Amplifier Doubles as a Preamplifier, Features Switchable Impedance Modes, and Comes with Tone Controls
Getting vintage-inspired tube warmth, smoothness, and texture doesn't need to cost a fortune. The Fosi Audio GR70 tube headphone amplifier pairs two 5654W and two 6Ж4/6Ж8 tubes for two-stage amplification that provides detailed, balanced, transparent sound. Able to support headphone impedance ranging from 16 to 300 ohms, GR70 can also double as a preamplifier thanks to its rear-panel RCA input and output. Boasting a dynamic range and SNR of more than 97dB, this pint-sized device is rated at 90mW (at 32 ohms) and allows for high- and low-impedance mode switching for excellent versatility.
Clean and dynamic, GR70 is a joy to use. Its CNC-machined aluminum alloy body houses a top-panel volume knob, bass and treble controls, and dual-side ventilation holes to help it run cool. A 12V power supply and tube protection covers come standard, along with a two-year manufacturer warranty. Considering the price and value, GR70 is practically a no-brainer for 'phone enthusiasts.
Highlights
- 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 6Ж4/6Ж8 vacuum tubes for two-stage amplification. The 5654W tubes boost voltage, while the 6Ж4/6Ж8 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
Downloads
User Manual (PDF, 3.324 MB)
Specifications
- 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
