Fosi Audio GR70

Brand: Fosi Audio

₹29,500.00

The Fosi Audio GR70 is a two-in-one tube headphone amplifier and preamplifier designed to bring warm vacuum-tube character to personal and home Hi-Fi systems. Featuring four vacuum tubes, dual headphone outputs, RCA input/output, bass and treble controls, and selectable impedance modes, it supports headphones ranging from 16Ω to 300Ω.

GR70

Fosi Audio GR70

The Fosi Audio GR70 combines traditional vacuum-tube amplification with practical connectivity for modern headphone and stereo systems. Its two-stage tube architecture uses two 5654W tubes for voltage amplification and two 6Ж4 tubes for power amplification, producing a warm, textured and transparent presentation. The GR70 supports both 3.5mm and 6.35mm headphone connections alongside rear RCA input and output for use as a dedicated preamplifier. Selectable low and high impedance modes accommodate headphones from 16Ω to 300Ω, while bass and treble controls provide additional sound adjustment. Its CNC-machined aluminium alloy chassis combines compact dimensions with durable construction.

GR70

Details & Specifications

Design & Tube Configuration

Brand	Fosi Audio
Model	GR70
Product Type	Tube Headphone Amplifier / Preamplifier
Amplification Type	Vacuum Tube
Voltage Amplification Tubes	2 × 5654W
Power Amplification Tubes	2 × 6Ж4
Amplification Architecture	Two-Stage Tube Amplification
Chassis Material	CNC-Machined Aluminium Alloy

Headphone Amplification

Maximum Power Output	300mW @ 32Ω
Supported Headphone Impedance	16Ω–300Ω
Low Impedance Mode	16Ω–120Ω
High Impedance Mode	120Ω–300Ω
Headphone Outputs	3.5mm / 6.35mm

Inputs, Outputs & Preamp

Analogue Input	RCA
RCA Preamp Output	Supported
RCA Output Level	1.2V
3.5mm Headphone Output	Supported
6.35mm Headphone Output	Supported
Functions	Headphone Amplifier / Preamplifier

Controls & Audio Performance

Volume Control	Large Front-Mounted Volume Knob
Bass Control	Supported
Treble Control	Supported
Impedance Mode Switching	Low / High
Signal-to-Noise Ratio	≥ 97dB

Power & Construction

Power Input	DC 12V / 3A
Chassis	CNC-Machined Aluminium Alloy
Ventilation	Dual-Side Ventilation

Downloads

About Fosi Audio

Fosi Audio develops audio products focused on making high-quality listening systems accessible, practical and easy to integrate into modern Hi-Fi setups. Its product range combines compact engineering, straightforward functionality and contemporary design for music enthusiasts building both desktop and home audio systems. With products spanning amplification, digital audio and analogue playback, Fosi Audio places emphasis on flexible system building and user-friendly performance. Its range is designed to support listeners seeking compact, versatile and capable components for modern stereo and personal audio systems.

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