Fosi Audio GR70 – Röhren-Kopfhörerverstärker / Hi-Fi-Vorverstärker – RCA-Eingang – Schwarz

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Product details

The GR70 headphone tube amplifier combines vintage charm with modern technology, offering authentic tube essence. Perfect for headphone enthusiasts, it pairs excellently with over-ear and in-ear headphones, delivering superior sound. The GR70 features two 5654W and two 6AC7 vacuum tubes for two-stage amplification. The 5654W tubes increase the voltage, while the 6AC7 tubes handle the power amplification. This setup provides balanced, transparent, and structured sound. The tube headphone amplifier offers intuitive controls, including a large volume knob, dual-sided ventilation openings, bass and treble controls, and a switch for high and low impedance modes, making it extremely versatile. Crafted with a CNC-machined aluminum alloy casing, the GR70 is both durable and refined. With its compact size, it delivers up to 300 mW of output power.

Key specifications

Scope of application
HiFi, PC
Power supply
Electrical connection

General information

Item number
67533393
Manufacturer
Fosi Audio
Category
Headphone amplifiers
Manufacturer No.
GR70
Release date
24.2.2026
Sales rank in Category Headphone amplifiers
56 of 358

Colour

Colour
Black
Exact colour description
Black

Headphone amplifier properties

Scope of application
HiFi, PC

Audio properties

Recommended headphone impedance
16 - 300 Ω (ohm)

Connections

Audio outputs
Headphone jack 3.5mm (1x), Headphone jack 6.3mm (1x)

Power supply

Power supply
Electrical connection

Origin

Country of origin
China

Voluntary climate contribution

CO₂ emissions
137.71 kg
Climate contribution
CHF 3.28

Scope of delivery

Scope of delivery
Manual, Power supply

Product dimensions

Length
192 mm
Width
129 mm
Height
46 mm

Package dimensions

Length
30 cm
Width
29 cm
Height
12 cm
Weight
1.20 kg

30-day right of return
24 Months Warranty (Bring-in)

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Reviews & Ratings

Warranty score

How often does a product of this brand in the «Headphone amplifiers» category have a defect within the first 24 months?

Source: Digitec Galaxus
  • 1.Behringer
    0.3 %
  • 2.Mackie
    0.9 %
  • 3.Fosi Audio
    1.7 %
  • 4.iFi Audio
    2.5 %
  • 5.FiiO
    3 %

Warranty case duration

How many working days on average does it take to process a warranty claim from when it arrives at the service centre until it’s back with the customer?

Source: Digitec Galaxus
  • 1.FiiO
    0 days
  • 2.Fosi Audio
    1 day
  • 3.iFi Audio
    5 days
  • Behringer
    Not enough data
  • Mackie
    Not enough data

Return rate

How often is a product of this brand in the «Headphone amplifiers» category returned?

Source: Digitec Galaxus
  • 1.Mackie
    0.6 %
  • 2.Fosi Audio
    5.7 %
  • 3.FiiO
    6.8 %
  • 4.iFi Audio
    8.6 %
  • Behringer
    Not enough data
Source: Digitec Galaxus