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  • 2 VIDEOS
Fosi Audio GR70 Tube Headphone Amp Preamp Introduction VideoFosi Audio
  • Fosi Audio 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
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Fosi Audio 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

3.9 out of 5 stars (35)
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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 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
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This item: Fosi Audio 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
$262.19
Get it by Tuesday, Jan 6
In Stock
Sold by Fosi Audio and ships from 鶹 Fulfillment.
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Fosi Audio 2RCA to 2RCA Cable 3.9Ft, Gold-Plated 2 RCA Male to 2 RCA Male Stereo Audio Cable for Home Theater Systems/Amplifi
$29.99($7.69/feet)
Get it by Tuesday, Jan 6
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Sold by Fosi Audio and ships from 鶹 Fulfillment.
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Product information

Technical Details

Brand ‎Fosi Audio
Manufacturer ‎Shenzhen Foresight Technology Co., Ltd.
Place of Business ‎Shenzhen Foresight Technology Co., Ltd.
Model ‎GR70
Model Name ‎GR70
Part Number ‎GR40
Compatible Devices ‎Guitar, Double Bass, Keyboard, Drum, Violin, Viola, Ukulele, Cello, Banjo, all
Amplifier Type ‎Tube
Mounting Hardware ‎5654 Vacuum Tubes, 6AC7 Vacuum Tubes, DC 12V/3A Power Supply, Fosi Audio GR70 Main Unit, Tube Protection Covers
Number of Items ‎1
Output Wattage ‎300 Watts
Power source type ‎AC adapter
Batteries included ‎No
Batteries Required ‎No
Speaker Output Channel Quantity ‎2
Material Type ‎Aluminum Alloy
Manufacturer ‎Shenzhen Foresight Technology Co., Ltd.
Item model number ‎GR70
Product Dimensions ‎16 x 10.67 x 3.81 cm; 1.41 kg
ASIN ‎B0FB3P3RZT

Additional Information

Date First Available June 16 2025
Customer Reviews
3.9 out of 5 stars (35)

3.9 out of 5 stars

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Fosi Audio 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

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Product Description

GR70 Tube Headphone Amp

Fosi Audio GR70 Vacuum Tube Headphone Amp/Preamp

Featuring two replaceable 5654W and two 6AC7 vacuum tubes, it offers a customizable auditory experience. Immerse yourself in the authentic warmth and smoothness of analog audio.

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;
  • SNR≥97dB; Frequency Range: 20Hz - 20kHz (±1 dB);

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

Integrating Vintage Charm with Modern Precision

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