Fosi Audio MC331 Hybrid Tube Amplifier

Compact Hybrid Amplifier With Tube Character!

The Fosi Audio MC331 blends classic tube charm with modern digital technology, combining a stereo amplifier, DAC, preamp and headphone amplifier in a compact chassis. With a maximum output power of 2 x 105 watts at 4 ohms, the hybrid amplifier drives passive bookshelf and desktop speakers with authority. Bluetooth, USB, Cinch/Phono, optical and coaxial digital inputs give you a versatile connection palette for smartphones, computers, CD players, streamers and other audio sources. Swappable 5654W vacuum tubes, an analog VU meter and the handy remote marry retro Hi-Fi flair with modern usability.

Versatile All-in-One Audio Solution

The MC331 is far more than a traditional mini amplifier. Fosi Audio combines an integrated DAC with a stereo power stage, preamp and headphone amp. That lets you connect both digital and analog sources directly—no need for multiple separate audio components on your desk or in a Hi-Fi rack. Available connections include Bluetooth, USB, Cinch/Phono, Optical/Toslink and coaxial. Wireless Bluetooth playback supports the SBC and AAC codecs.

Powerful Stereo Amplifier

With a maximum output power of 2 x 105 watts at 4 ohms, the compact integrated amplifier offers plenty of headroom for many passive speakers. It supports speakers with an impedance of 4 to 8 ohms. A signal-to-noise ratio of at least 100 dB and a total harmonic distortion of no more than 0.03% underline the design's focus on high-quality music reproduction.

Tube Aesthetics Meet Modern Hi-Fi

The 5654W vacuum tubes not only define the MC331's distinctive look. Together with the analog mini VU meter they create a classic tube-amp design that deliberately blends retro elements into modern desktop and Hi-Fi systems. The tubes are replaceable; the manufacturer lists compatible types such as 6AK5, 6AK5W, 6Zh1P and 6J1, allowing you to fit different suitable tubes.

Flexible for Speakers, Headphones and 2.1 Systems

In addition to outputs for passive stereo speakers, the MC331 offers a 3.5 mm headphone jack and a Pre-Out. Using the preamp output you can, for example, add an active subwoofer to create a compact 2.1 setup. That makes the amplifier equally well suited for desktop audio, PC Hi-Fi, stereo systems and space-saving living room setups.

Convenient Operation via Remote Control

The included remote control makes it easy to operate from your listening position, letting you select the audio source and adjust bass and treble, among other functions. Despite its versatile feature set, the MC331 remains pleasantly compact in a desktop-friendly format. Power is supplied by the included power adapter (24 V / 4.5 A).

Retro Tube Amp for Modern Audio Sources

Whether as a Bluetooth amplifier for your smartphone, a USB DAC amp for your computer, a compact stereo integrated amplifier for passive speakers, or a headphone amp at your desk—the Fosi Audio MC331 covers many applications with a single device. Its combination of digital and analog inputs, robust stereo power, tube technology, VU meter and remote control makes it a flexible hub for modern Hi-Fi and desktop audio systems.

Discover the Fosi Audio MC331 as a versatile hub for your compact Hi-Fi system!