Fosi Audio GR70 Tube Headphone Amplifier and Preamplifier with GE 5654W Vacuum Tubes and Bass Treble Controls
The Fosi Audio GR70 is a high-performance desktop vacuum tube headphone amplifier and preamplifier designed to deliver a classic, warm, and musical sound signature. Featuring high-quality General Electric 5654W tubes, the GR70 effectively softens the harshness of digital audio, providing a richer and more organic listening experience. Whether you are using it to drive your favorite pair of headphones or as a dedicated preamp for your active speakers, the GR70 adds a layer of harmonic depth and airiness to your audio chain.
Housed in a rugged, CNC-machined aluminum alloy chassis with a striking industrial aesthetic, the GR70 is built for both performance and longevity. It features independent bass and treble tone controls, allowing you to fine-tune your sound to match your specific headphones or room acoustics. With support for a wide range of headphone impedances and a dedicated RCA output, this versatile unit is the perfect centerpiece for audiophiles looking to integrate the timeless charm of tube amplification into a modern desktop environment.
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Features:
- Authentic Vacuum Tube Warmth: Utilizes a quad-tube configuration with GE 5654W tubes to provide a smooth, analog sound that enhances vocal clarity and instrument separation.
- Dual-Purpose Functionality: Acts as a powerful headphone amplifier and a high-fidelity preamplifier, making it easy to integrate into both headphone and speaker-based systems.
- Precision Tone Customization: Features dedicated bass and treble knobs with a center-point detent for flat response or personalized frequency adjustments.
- Versatile Headphone Support: Equipped with 3.5mm and 6.35mm outputs to accommodate standard and professional-grade headphone cables without the need for adapters.
- Switchable Impedance Optimization: Includes a dedicated toggle for high and low impedance settings to ensure a perfect match for sensitive IEMs or demanding over-ear headphones.
- High-Quality Components: Built with premium resistors and capacitors to ensure a low-noise floor and transparent signal transmission.
- Durable Aluminum Construction: The sandblasted CNC aluminum housing provides excellent heat dissipation and protects the internal circuitry from external interference.
- User-Replaceable Tubes: Designed with a plug-and-play tube architecture, allowing enthusiasts to experiment with different 5654W, 6J1, or 6K4 tubes for sound tuning.
Specifications:
- Amplifier Type: Vacuum Tube (Class A)
- Included Tubes: 2x GE 5654W and 2x 6AK5
- Headphone Outputs: 3.5mm Single-ended and 6.35mm (1/4 inch) Stereo
- Analog Inputs: Stereo RCA
- Analog Outputs: Stereo RCA (Pre-out)
- Maximum Power Output: 300mW per channel at 32 Ohms
- Headphone Impedance Range: 16 Ohms to 300 Ohms
- Frequency Response: 20Hz to 20kHz (plus or minus 1dB)
- Signal to Noise Ratio: 97dB
- THD: Less than or equal to 0.5 percent
- Power Supply: DC 12V
- Chassis Material: Aluminum Alloy
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