The volume is very low when connecting the turntable to the MC331. Do I need a turntable preamp?

If your turntable does not have a built-in preamp, you will need to add a separate phono preamp (such as the BOX series). If your turntable has a built-in preamp, make sure it's set to LINE mode to output the signal properly.

Q: What is the purpose of the pre-out port on the MC331?

The MC331 has a pre-out port that can be connected to a powered subwoofer, speaker, or another amplifier with passive speakers for better sound quality.

Can headphones and passive speakers play simultaneously?

The MC331 defaults to headphone output priority. To use speaker output, you need to disconnect the headphones first.

What tube models are compatible for replacement?

The following tube models are compatible: EF95, 6AK5, 6AK5W, 403A/403B, 6J1, 6J1P, 6J2, 6J3, 6J4, 6J5, among others. You can test and choose based on your personal preference.

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Fosi Audio MC331 Tube Integrated Amplifier with DAC, 2 Channel Home Audio Stereo Power Amp for HiFi Bookshelf Speakers/3.5mm Headphones, Vintage VU Meter Preamp with Bluetooth and USB/Opt/Coax/RCA

Fosi Audio MC331 Tube Integrated Amplifier with DAC, 2 Channel Home Audio Stereo Power Amp for HiFi Bookshelf Speakers/3.5mm Headphones, Vintage VU Meter Preamp with Bluetooth and USB/Opt/Coax/RCA

Product ID: 677084389

Details

Brand
Fosi Audio
Item dimensions L x W x H
5.94 x 5.31 x
Manufacturer
Shenzhen Co.
Mounting Type
Freestanding
Voltage
110 Volts (AC)

💡Vintage 5725W tube + VU meter glow

📡Bluetooth + USB/Opt/Coax/RCA inputs

🔊105W x2 power output

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VT58378

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Details

Brand
Fosi Audio
Item dimensions L x W x H
5.94 x 5.31 x
Manufacturer
Shenzhen Co.

Description

🎶 Elevate your audio game with vintage warmth and modern power — because your sound deserves the spotlight.

ICONIC TUBE WARMTH - Authentic 5725W vacuum tubes paired with a vintage VU meter deliver rich, warm sound and a retro-modern vibe.
POWER MEETS PRECISION - 105W per channel drives your bookshelf speakers with room-filling clarity and dynamic range.
COMPACT COMMAND CENTER - Sleek, metal chassis fits stylishly on any desk or shelf without sacrificing power or durability.
SEAMLESS SOURCE SWITCHING - Bluetooth, USB, optical, coaxial, and RCA inputs cover every device in your digital and analog arsenal.
TAILORED LISTENING EXPERIENCE - Remote-controlled bass and treble adjustments plus replaceable tubes let you customize your perfect sound signature.

The Fosi Audio MC331 is a compact yet powerful 2-channel tube integrated amplifier featuring 105W per channel output, a built-in DAC, and versatile connectivity including Bluetooth, USB, optical, coaxial, and RCA inputs. Its vintage 5725W vacuum tubes and amber-lit VU meter combine classic tube warmth with modern design aesthetics. Designed for audiophiles and professionals alike, it offers remote-controlled tone adjustments and a robust metal build, making it a premium choice for HiFi bookshelf speakers and headphones.

Specifications

ASIN	B0DM1VLXHN
Best Sellers Rank	#10,178 in Electronics ( See Top 100 in Electronics ) #43 in Audio Component Amplifiers
Brand	Fosi Audio
Built-In Media	MC331;Bluetooth Antenna;Vacuum Tube2;Tube Cover2; 24V4.5A Power Adapter;Remote
Customer Reviews	4.3 out of 5 stars 385 Reviews
Item Weight	4.2 Pounds
Manufacturer	Shenzhen Foresight Technology Co., Ltd.
Mfr Part Number	MC331
Model Number	MC331
Warranty Description	24 Months Manufacturer

Reviews

A**N

27.12.2025

G**L

10.02.2026

A**N

13.11.2025

J**W

24.06.2025

R**.

2.12.2025

J**A

26.01.2026

S**T

29.04.2026

P**A

7.07.2025

A**ー

17.04.2026

F**E

7.03.2026

A**R

24.07.2025

J**N

13.04.2026

G**N

23.12.2025

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