Description

The Fosi Audio GR70 is a compact, hybridtube headphone amplifier designed todeliver the warm, rich, and musical sounosignature associated with vacuum tubescombined with the power and clarity ofsolid-state amplification.lt serves as anexcellent entry point into the world of tubeaudio for headphone enthusiasts.
Key Features & Design
1. Hybrid Tube Amplification: At the heartof the GR70 is its hybrid design.lt usesa vacuum tube in the pre-amplificationstage to impart the characteristic "tubewarmth" and harmonic richness to theaudio signal. This signal is then handedoff to a solid-state output stage, whichprovides the clean power and controlneeded to drive a wide range of
headphones efficiently. This design offers the best of both worlds: the pleasing sonic character of tubes without the high cost and maintenance of a full tube (OTL) amplifier.

2.User-Interchangeable Tubes: Astandout feature is its ability to "rol" orswap tubes.The amplifier comes standard with a pair of 6J1 tubes, but users can easily replace them with
other compatible tubes (like 6AK5 6AK5W, EF95, 5654) to subtly tailor the
sound to their preference. This allows for a personalized listening experience
3. Dual Outputs with lmpedance
Matching: The GR70 is equipped withtwo headphone outputs:
Low-lmpedance Output(0-150Q):Optimized for most modern dynamic driver headphones,lEMs (In-Ear Monitors),and lower-impedance models.

Specifications

• Weight: 200gr
• Usage: Indoor & outdoor

Pros and cons

• Sustainably produced
• Ideal for everyday use
• May discolor in direct sunlight