Fosi Audio MC331 Tube Integrated Amplifier Bluetooth DAC

The Fosi Audio MC331 is a compact integrated hybrid amplifier that combines the warm and musical character of vacuum tubes with modern digital connectivity. With a built-in DAC, Bluetooth receiver, headphone amplifier and power amplifier, the MC331 functions as a complete solution for both music streaming, TV sound and classic hi-fi systems.

The preamp section uses two JAN5654W tubes, which add a natural warmth and fullness to the sound, while the efficient class D amplification delivers plenty of power to modern speakers. The elegant VU meter on the front gives a classic analogue look and emphasizes the amplifier's retro-inspired design.

The MC331 supports both analogue and digital audio sources via Bluetooth, USB, optical, coaxial and RCA inputs. This makes it easy to connect everything from computers, streamers and TVs to CD players and other hi-fi components. In addition, the amplifier is equipped with a headphone output and pre-out, so it can also be used with active subwoofers or external power amplifiers.

Bass and treble controls allow you to tailor the sound to your personal preferences, and the interchangeable tubes allow you to experiment with different sound signatures.

Specifications:

• Type: Integrated hybrid tube amplifier with DAC
• Channels: 2.0 stereo
• Tube: 2 × JAN5654W
• Amplifier chip: TI TPA3221
• Output power: 2 × 105 W at 4 ohms
• Speaker impedance: 4-8 ohms
• Frequency range: 20 Hz – 20 kHz (± 1 dB)
• Signal-to-noise ratio (SNR): ≥ 100 dB
• Total harmonic distortion (THD): ≤ 0.03 %
• Bluetooth: Version 5.0
• DAC resolution: Up to 24-bit / 96 kHz
• Inputs: Bluetooth, USB-C, optical, coaxial, RCA
• Outputs: Speaker terminals, 3.5 mm headphone output, 3.5 mm pre-out
• Tone control: Bass and treble
• Remote control: Yes
• Power supply: 24 V / 4.5 A

Included accessories:

• 2 × JAN5654W tubes
• Bluetooth antenna
• Remote control
• Power supply
• Tube protective caps
• User manual