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FOSI AUDIO MC331 Integrated Amplifier

The Fosi Audio MC331 is a powerful little hybrid integrated amplifier based on JAN5654W tubes and a TI TPA3221 chip. This little jewel blends modern and vintage technology, and is capable of delivering up to 2x105W of power under 4 ohm, enough to soundtrack a beautiful space.

Average votes for this product
1.0 / 5
  Based on 2 customers reviews.

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Reference : 20242
New product

139,00 €tax incl.

115,83 € tax excl.
dont 0,90 € d'éco-participation

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Shipping date: 14-10-2026.

Orders placed before 12h (GMT+1) will generally be shipped the same day (working day).

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Facturation France
SAV France

2 Years warranty

Accessories for this product

Find here a selection of useful and/or essential accessories for this product. These are specially selected by the Audiophonics team according to the characteristics of the product.

 
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Fosi Audio MC331 Tubes Integrated Amplifier JAN5654W Bluetooth 5.0 2x105W 4 Ohm

Photo du Fosi Audio MC331

The Fosi Audio MC331 is a powerful little hybrid integrated amplifier based on JAN5654W tubes and a TI TPA3221 chip. This little jewel blends modern and vintage technology, and is capable of delivering up to 2x105W of power under 4 ohm, enough to soundtrack a beautiful space.

In addition to its RCA input, it features numerous digital inputs (USB-C, Toslink optical, coaxial SPDIF), as well as Bluetooth 5.0 functionality for reliable, stable wireless transmission thanks to a proprietary DAC/Bluetooth chip. There's also a 3.5mm pre-out jack for coupling to an active subwoofer, and a 3.5mm headphone output on the front panel.

Highly versatile and elegant, Fosi Audio has given its MC331 amplifier a stylish appearance, with a round vumeter and transparent glass tube protectors. The user experience is further enhanced by an infrared remote control.

Fosi Audio MC331: JAN5654W tube preamplifier & TPA3221 TI amplifier

The MC331 combines a pair of JAN 5654W tubes and a TI TPA3221 chip to deliver warm, powerful sound with 2x105W output power at 4 ohms. This amplifier is therefore capable of providing a considerable amount of sound, coupled with suitable speakers. What's more, its 3.5mm pre-out jack output makes it easy to set up a 2.1-channel system with an active subwoofer. JAN 5654W tubes are interchangeable with many other models: 6AK5, 6AK5W, 6Zh1P, 6J1, 6J1P, WE-403A, 403B, EF95 and many other 7-pin tubes. This makes it possible to achieve the desired sound coloration.

Photo des tubes JAN 5654W
Sortie casque du Fosi Audio MC331

Fosi Audio MC331: headphone amplification function

Thanks to its 3.5mm jack output, the Fosi Audio MC331 can drive headphones or IEMs with impedances ranging from 32 to 300 ohms. Extremely practical when placed on your desk, for example.

Fosi Audio MC331: Bluetooth 5.0

The Fosi Audio MC331 features Bluetooth 5.0 functionality to ensure reliable, stable reception of an audio signal. It supports AAC and SBC codecs.

Fonction Bluetooth du Fosi Audio MC331

Fosi Audio MC331: Retro look and tone control

The Fosi Audio MC331 features an attractive round vumeter on its front panel, as well as two transparent glass tube covers contributing to the retro look of the Fosi MC331. In addition, 3 potentiometers on the front panel control volume, bass and treble tones to fine-tune the final sound.

Mise en situation du Fosi Audio MC331

Fosi Audio MC331 overview

Aperçu du Fosi Audio MC331
1Vumeter
2Input LED indicator
3IR receiver
43.5mm headphone output
5Tube protection
6JAN 5654W tubes
7Treble adjustment potentiometer
8Bass adjustment potentiometer
9Volume potentiometer
10USB-C input
11Bluetooth antenna
12Toslink optical input
13SPDIF coaxial input
14RCA input
15Speaker terminal output
16Pre-out jack 3.5mm
1719V-24V DC power supply via DC jack

Caractéristiques techniques

Specifications
Product typeIntegrated tube amplifier
ChannelStereo
Tubes2x JAN5654W
Amplification chipTI TPA3221
Inputs1x USB-C
1x Optical Toslink
1x Coaxial
1x RCA stereo
Bluetooth
Outputs1x Speaker terminal output
1x Pre-out jack 3.5mm
1x Jack 3.5mm headphone output
Output power2x105W @ 4 ohm
THD≤ 0.03%
SNR≥ 100dB
Terminaison impedance4-8 Ohm
Frequency response20Hz–20kHz (±1 dB)
Supported sample ratesUSB: PCM up to 24bit 96Khz
Optical Toslink / Coaxial: PCM up to 24bit 96kHz
Bluetooth version5.0
Supported Bluetooth codecsSBC, AAC
Bluetooth range10m
Volume control
Tone controlBass and treble
Vumeters
IR remote
General
Power supply19V-24V DC via jack DC
Dimensions135 x 135 x 50mm (without tubes)
Package1x Fosi Audio MC331
2x Tubes JAN5654W (GE5654)
1x Bluetooth antenna
1x IR remote control
1x 24V 4.5A power adapter
 
Data sheet
InputBluetooth
InputRCA
InputOptical
InputUSB
InputSPDIF
OutputJack 3.5mm
OutputSpeaker terminal
ColorBlack
Channel2 (Stereo)
ClassN/A
Amplifier chipTPA3221
Amplifier chipTube
Power (W)105.0
Remote ControlYes
 
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Average votes
1.0 / 5
2 reviews
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Note :
 1/5
Date :
Horrible for quiet music
The sound might be good,
But if you have quiet music, than the amplifiers thinks, he can mute till it is louder again. It isn't fast enough and you can here the unmute.
For example a piano, which plays only a few notes. The attack you will not here. It unmutes to late.
Also if you have a quiet flute at the same time, the flute will be muted.
It is horrible for me.
It does not depend on the input. It does it for analogue and digital input signals.
 (0)
 (0)
This review has been posted for FOSI AUDIO MC331 Tubes Integrated Amplifier JAN5654W Bluetooth 5.0 2x105W 4 Ohm
Note :
 1/5
Date :
Pas utilisable à bas volume !
Cet amplificateur marche très bien et le rendu sonore est très correct. Cependant il a un défaut important. A bas volume le son se coupe et il est donc inutilisable pour par exemple pour une utilisation sur un bureau.
Fosi audio ne propose rien pour arranger cela. Dommage...
 (0)
 (1)
This review has been posted for FOSI AUDIO MC331 Tubes Integrated Amplifier JAN5654W Bluetooth 5.0 2x105W 4 Ohm
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FOSI AUDIO MC331 Tubes Integrated Amplifier JAN5654W Bluetooth 5.0 2x105W 4 Ohm
FOSI AUDIO MC331 Tubes Integrated Amplifier JAN5654W Bluetooth 5.0 2x105W 4 Ohm
The Fosi Audio MC331 is a powerful little hybrid integrated amplifier based on JAN5654W tubes and a TI TPA3221 chip. This little jewel blends...

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