---
product_id: 253500536
title: "FX-aUDIO TUBE-03 Mini HiFi audio Preamplifier 6K4 Vacuum Tube amplifier Buffer Treble Bass adjustment RCa Preamp Black EU Plug"
brand: "fx-audio"
price: "¥2289"
currency: JPY
in_stock: true
url: https://www.desertcart.jp/products/253500536-fx-audio-tube-03-mini-hifi-audio-preamplifier-6k4-vacuum
store_origin: JP
region: Japan
---

# Compact Design 6K4 Vacuum Tubes Treble & Bass Control FX-aUDIO TUBE-03 Mini HiFi audio Preamplifier 6K4 Vacuum Tube amplifier Buffer Treble Bass adjustment RCa Preamp Black EU Plug

**Brand:** fx-audio
**Price:** ¥2289
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate Your Audio Game with FX-audio!

## Quick Answers

- **What is this?** FX-aUDIO TUBE-03 Mini HiFi audio Preamplifier 6K4 Vacuum Tube amplifier Buffer Treble Bass adjustment RCa Preamp Black EU Plug by fx-audio
- **How much does it cost?** ¥2289 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/253500536-fx-audio-tube-03-mini-hifi-audio-preamplifier-6k4-vacuum)

## Best For

- fx-audio enthusiasts

## Why This Product

- Trusted fx-audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Unleash Your Sound:** Experience the rich, warm timbre of your favorite tracks.
- • **Portable Powerhouse:** Compact design for music lovers on the go.
- • **Noise-Free Listening:** Isolated audio and power sections for crystal-clear sound.
- • **Seamless Compatibility:** Fits most active speakers and power amplifiers effortlessly.
- • **Tailored Audio Experience:** Adjust treble and bass to match your mood.

## Overview

The FX-audio TUBE-03 Mini HiFi audio preamplifier is a versatile and compact solution for audiophiles, featuring replaceable 6K4 vacuum tubes, treble and bass adjustments, and a design that minimizes sound interference. Perfect for enhancing your audio experience with active speakers and power amplifiers.

## Description

Overview: With wide applied range and practicability, this preamplifier can fit the majority of active speakers and power amplifiers in the market. The replaceable 6K4 vacuum tubes design can optimize the circuit. The audio part and the power part are completely separated, which minimizes the interference to the sound. The timbre is soft and beautiful, sweet and warm and with powerful bass, penetrating treble. With treble and bass adjustment, single power supply, it's small and portable, brings you much fun and convenience. Using high-quality aluminum alloy housing with gold-plated connectors, it's durable and high-performance.  Specifications: Brand Name: FX-AUDIO Model Number: TUBE-03 Tube Model: 6K4 Frequency Response: ±1.5(20Hz-20KHz) Audio Input Interface: RCA Audio Output Interface: RCA RCA Output: 0.9Vrms SNR: 100dB THD: 0.03% Treble Adjustable Range: ±6dB Bass Adjustable Range: ±10dB Input Voltage: AC 100-240V, 50/60Hz; DC 12V/1A Color: Black Main Item Size: approx. 12 * 9.8 * 3.3cm / 4.72 * 3.85 * 1.29in Main Item Weight: approx. 318g / 11.21oz Package Size: approx. 22 * 21 * 7cm / 8.66 * 8.26 * 2.75in Package Weight: approx. 566g / 19.96oz  Package List: 1 * Preamplifier 1 * Power Adapter 1 * User Manual (English & Chinese)

## Features

- * With wide applied range and practicability, it can fit the majority of active speakers and power amplifiers in the market.
- * The replaceable 6K4 vacuum tubes design can optimize the circuit.
- * The audio part and the power part are completely separated, which minimizes the interference to the sound.
- * The timbre is soft and beautiful, sweet and warm and with powerful bass, penetrating treble.
- * With treble and bass adjustment, single power supply, it's small and portable, brings you much fun and conveniece.

## Product Details

- **Compatible devices:** Amplifier, Speaker
- **Specific uses for product:** Amplifier
- **Connector type:** RCA
- **Colour:** Black
- **Item dimensions L x W x H:** 22 x 21 x 7 centimeters

## Images

![FX-aUDIO TUBE-03 Mini HiFi audio Preamplifier 6K4 Vacuum Tube amplifier Buffer Treble Bass adjustment RCa Preamp Black EU Plug - Image 1](https://m.media-amazon.com/images/I/51v5TYVjJ8L.jpg)
![FX-aUDIO TUBE-03 Mini HiFi audio Preamplifier 6K4 Vacuum Tube amplifier Buffer Treble Bass adjustment RCa Preamp Black EU Plug - Image 2](https://m.media-amazon.com/images/I/51jwmF7gtoL.jpg)
![FX-aUDIO TUBE-03 Mini HiFi audio Preamplifier 6K4 Vacuum Tube amplifier Buffer Treble Bass adjustment RCa Preamp Black EU Plug - Image 3](https://m.media-amazon.com/images/I/51WePtE0WoL.jpg)
![FX-aUDIO TUBE-03 Mini HiFi audio Preamplifier 6K4 Vacuum Tube amplifier Buffer Treble Bass adjustment RCa Preamp Black EU Plug - Image 4](https://m.media-amazon.com/images/I/61p0S6NUyNL.jpg)
![FX-aUDIO TUBE-03 Mini HiFi audio Preamplifier 6K4 Vacuum Tube amplifier Buffer Treble Bass adjustment RCa Preamp Black EU Plug - Image 5](https://m.media-amazon.com/images/I/615E82yl7sL.jpg)

## Frequently Bought Together

- FX-aUDIO TUBE-03 Mini HiFi audio Preamplifier 6K4 Vacuum Tube amplifier Buffer Treble Bass adjustment RCa Preamp Black EU Plug
- KabelDirekt كابل RCA 10 م، وكابل صوت ستيريو 2 RCA إلى 2 RCA كابل محوري، ذكر RCA/ذكر، تناظري أو رقمي، لمضخم الصوت/مكبر الصوت/هاي فاي والمسرح المنزلي/بلو راي/جهاز استقبال، أسود, 404, 10m

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**Shop now:** [https://www.desertcart.jp/products/253500536-fx-audio-tube-03-mini-hifi-audio-preamplifier-6k4-vacuum](https://www.desertcart.jp/products/253500536-fx-audio-tube-03-mini-hifi-audio-preamplifier-6k4-vacuum)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-22*