• Home
  • Fosi Audio GR70 Headphone Amplifier

NEW Fosi Audio GR70 Headphone Amplifier

Fosi AudioPart # 235-257
Model: GR70

The Fosi Audio GR70 is a tube headphone amplifier and preamp that blends vintage tube warmth with modern features. It supports both low and high impedance headphones and includes tone controls, a large volume knob, and versatile input/output for desktop systems. Designed for users who want more character from their headphone listening or want a tube-flavored preamp stage.

Key Features

  • Pure tube amplification using two 5654W tubes and two 6Ж4 tubes for dual-stage warmth and detail
  • Switchable impedance modes: low (16-120Ω) and high (120-300Ω) to match a wide range of headphones
  • 6.35 mm (1/4") and 3.5 mm headphone jacks on the front panel
  • RCA input for source connection and RCA output for preamp use
  • Maximum 300 mW output into 32Ω loads, giving reasonable power for many over-ears
  • Bass & treble tone controls for shaping sound character
  • Aluminum alloy body, with a large top-mounted volume knob and visible tubes for aesthetic appeal
Similar items that may interest you:
Fosi Audio K7 HiFi Gaming DAC & Headphone Amplifier
Price: $159.99Part # 235-278
Topping DX3 Pro+ Desktop DAC and Headphone Amplifier
Price: $199.00Part # 220-200
See all items in Headphone Amplifiers
NEW $159.99
+ FREE SHIPPING
MSRP: $199.99
Save $40.00 (20%)
Bulk Pricing
In Stock
Get Notified When Available

We'll send you an email when Fosi Audio GR70 Headphone Amplifier is back in stock or available for preorder.

Ships next business day. Details
Free Shipping available on orders over $99.00 in the US. Details
60 Day No Hassle Return Policy

Overview

Fosi Audio GR70 Headphone Amplifier

Fosi Audio GR70 Headphone Amplifier

Replaceable Tubes

With two replaceable 5654W and two 6Ж4 vacuum tubes, it delivers a customizable listening experience. Enjoy the genuine warmth and smooth character of analog sound.

Integrating Vintage Charm with Modern Precision

The GR70 combines a headphone amp and preamp in one unit. With multiple headphone jacks and RCA input/output connections, it integrates seamlessly into your home audio system.

  • 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;

Quad-Tube Dual-Stage Amplification

Carefully chosen tube pairing delivers a rich and immersive musical sound.

Reminder: The tubes used int he GR70 are rare vintage components. Signs of aging on the tube appearance are normal and reflect their retro character and collectible value. Print styles on the tubes may vary slightly due to different production batches. Tubes are shipped at random; thank you for understanding.

Ideal for Headphone Enthusiasts

Works seamlessly with both over-ear and in-ear headphones to deliver outstanding audio.

Ideal Partner for the V3

Combines effortlessly with power amps and passive speakers to create a high-quality audio setup.

Customize your Unique Sound

Features central detents that make it easy to return to the natural sound setting.

Large Top-Mounted Volume Knob

Includes a precision damped potentiometer for smooth and accurate control.

Switchable Output Impedance

Provides precise control and cleaner sound across a broad range of full-size headphones and IEMs.

Efficient Cooling and Thermal Stability

Prevents dust buildup while allowing airflow to safeguard internal components.

A Blend of Metal and Elegance

Constructed from full aluminum alloy with a fine sandblasted finish, offering a minimalist and durable design.

Pure Tube Amplification
The GR70 headphone tube amp blends vintage character with modern technology, delivering true tube sound. Ideal for headphone enthusiasts, it works beautifully with both over-ear and in-ear headphones for superior audio. 

Quad Tubes
Equipped with two 5654W and two 6Ж4 vacuum tubes for two-stage amplification. The 5654W tubes handle voltage gain, while the 6Ж4 tubes provide power amplification, resulting in balanced, transparent, and textured sound. 

User-Friendly Design
This tube headphone amp preamp features intuitive controls including a large volume knob, dual-side ventilation, bass and treble adjustments, and high/low impedance switching for versatile operation. 

Two-in-One
Supports high and low impedance modes for 16Ω–300Ω headphones, with 6.35mm and 3.5mm headphone jacks on the front and RCA input/output on the rear for easy integration with home HiFi systems. 

Compact Yet Powerful
Built with a CNC-machined aluminum alloy body, the GR70 is durable and refined. Despite its compact footprint, it delivers up to 300mW power output and 1.2V RCA output with SNR ≥97dB, producing warm, clean, and dynamic sound.

Product Details

BrandFosi Audio
ModelGR70
Part Number235-257
UPC6976136960904
Unit of MeasureEach
Weight3.15

Specifications

Q&A

Reviews

Manuals & Resources

California Prop 65

WARNING: Cancer and Reproductive Harm

www.P65Warnings.ca.gov