---
product_id: 402592128
title: "FX-Audio Tube-02 Pro Tube Headphone Amplifier, Vacuum 5725 Tube Preamp, Mini Hi-Fi Integrated Stereo Class A amp Supports 32-600 ohms of Headphones, for Stereo Amplifier/Active Speaker"
brand: "kguss"
price: "$278"
currency: NZD
in_stock: true
reviews_count: 10
category: "Kguss"
url: https://www.desertcart.nz/products/402592128-fx-audio-tube-02-pro-tube-headphone-amplifier-vacuum-5725
store_origin: NZ
region: New Zealand
---

# Supports 32-600Ω headphones 850mW max output power Class-A tube + transistor hybrid amp FX-Audio Tube-02 Pro Tube Headphone Amplifier, Vacuum 5725 Tube Preamp, Mini Hi-Fi Integrated Stereo Class A amp Supports 32-600 ohms of Headphones, for Stereo Amplifier/Active Speaker

**Brand:** kguss
**Price:** $278
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your audio game with tube warmth and pro-level power!

## Quick Answers

- **What is this?** FX-Audio Tube-02 Pro Tube Headphone Amplifier, Vacuum 5725 Tube Preamp, Mini Hi-Fi Integrated Stereo Class A amp Supports 32-600 ohms of Headphones, for Stereo Amplifier/Active Speaker by kguss
- **How much does it cost?** $278 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/402592128-fx-audio-tube-02-pro-tube-headphone-amplifier-vacuum-5725)

## Best For

- kguss enthusiasts

## Why This Product

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

## Key Features

- • **Sleek Black Matte Metal Design:** Minimalist, elegant finish with glowing tube LEDs for a stylish desktop audio centerpiece.
- • **Versatile Compatibility & Drive:** Effortlessly powers a wide range of headphones (32-600Ω) and integrates with active speakers or turntables.
- • **Warm Tube Sound Meets Modern Power:** 5725 vacuum tubes deliver rich, dynamic audio with a silky midrange and detailed highs.
- • **High Gain Mode for Custom Listening:** Boost headphone output by +2.5dB without affecting speaker preamp levels.
- • **Dual RCA Inputs for Seamless Source Switching:** Easily toggle between two DACs or audio sources without unplugging cables.

## Overview

The FX-Audio Tube-02 Pro is a compact Class-A hybrid tube headphone amplifier featuring 5725 vacuum tubes and transistor buffering. It delivers up to 850mW output, supports headphones from 32 to 600 ohms, and offers dual RCA inputs for flexible source selection. With high gain mode and audiophile-grade components, it enhances sound clarity, warmth, and detail, making it ideal for desktop hi-fi setups, active speakers, and turntables—all wrapped in a sleek black metal chassis with glowing tube indicators.

## Description

Buy FX-Audio Tube-02 Pro Tube Headphone Amplifier, Vacuum 5725 Tube Preamp, Mini Hi-Fi Integrated Stereo Class A amp Supports 32-600 ohms of Headphones, for Stereo Amplifier/Active Speaker: Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: The FX-Audio Tube 02 Pro - A nice (and inexpensive) Head Amp that punches above its weight (edited) - I've edited my original comments with the adjustments below - edited on 16 February 2022 Before I begin, it is always essential to bear in mind that many of these Asian-made (predominantly Chinese made) Head-amp/preamp designs have virtually the exact same interior layouts and components, yet are often packaged differently with slight (or in some cases, major) modified exterior appearances. And with competition being what it is now-a-days, you can find many US companies periodically doing the same thing. Now enter the FX-Audio Tube 02 Pro - a nicely designed tube/class A head-amp/preamp design. After reading over the design parameters and noticing that it's a fairly new release (with only 2 reviews as of this writing), I elected to pull the trigger on one. When it arrived, I noticed a nicely designed unit with an all-metal design. What caught my eye immediately was that it included both 3.5 MM and 6.5 MM headphone inputs (this as opposed to the many similar competing designs that include only a 3.5 MM input). And what was also a positive is the inclusion of two GE designed 6J1 style tubes. You also have an on/off button (which also serves to select your inputs), along with a volume control knob to the right of the front panel. It also has a 2-gain setting button, and what's even nicer (or convenient) is that the gain settings affect headphones only - not the Preamp section. For example, in most headamps/preamps (that have switchable gain settings), adjustments to the gain also impact the line level outputs to speakers. So this is an added feature to have - that is, gain settings impacting headphones only. What is also unique about this particular model head-amp/preamp design is that it includes two Aux RCA inputs - allowing the connection of two different DAC's, if need be, with the option of selecting either one via the front button. After connecting it, I evaluated this unit using 3 different DAC's (not at the same time) - those being the JDS Labs Atom DAC X, the Topping D10S, and the Schiit Audio Modi 3+. As I usually do, I never begin evaluating any listening sessions until I've let the components warm up a bit. I had the FX-Audio Tube 02 Pro on for 24 hours before I began these evaluations. Interconnect cables used were from World's Best Cables and Blue Jeans Cables, with the USB cables being Audioquest Pearl models running from the DAC's to the USB inputs on a professional level desktop PC. Sound Personality: As can be expected, this is a true tube unit, and it imparts a warm, yet very dynamic and detailed sound quality - however, it is just a tad than comparable tube amps in the upper registers. With some DAC's that may have a dry personality, the Tube 02 Pro warms things up and adds a musicality that the DAC (when listening to alone) often lacks. Do keep in mind that other similar tube head-amps/preamps - such as the Douk Audio P1, or the X-Duoo MT-602 - have the same effect. One nice thing about the Tube 02 Pro is that it accurately portrays the sonic signature of different DAC units. If you have a bright sounding DAC, you will experience this added brightness through the Tube 02 Pro. The tubes in the Tube 02 Pro do not run hot at all, especially when you consider other tubed units that use different types of tubes. They never felt warmer than warm - no matter how long I've had the unit on. As an aside, the one tube in the Schiit Vali 2+ runs quite hot (like a heater) as an example. The tubes do light up more brightly in the Tube 02 Pro (at least in this enclosure) because they stick out more towards the top, whereas with competing units, the tubes are more recessed into the enclosure. And because of this design aspect in the Tube 02 Pro, the tubes are easier to remove and switch out (tube rolling). I must add that the stock GE tubes that came with this unit sound superb, and unless you are fixated on wanting to tube roll, you should be quite happy with the result. Now normally, when using these particular GE tubes, the audio typically balances out nicely, with a nice, lush sound. The very slight brightness that I alluded to indicates that the solid end of things has been calibrated to providethe best of both worlds (solid state and tubes). My initial listening sessions were conducted using a variety of speakers connected to a Cambridge AX25 Class AB integrated amp, followed by the Aiyima A07 and A08 class D models. I finished things out with the exemplary Fosi HD-A1 class AB amplifier. The speakers, I then eventually settled upon, were the Wharfedale D320's with a Mackie 8" Powered subwoofer under the desk. I listened to everything on a desktop, near-field environment. Speakers used in this evaluation included the aforementioned Warfedale D320, the KEF Q150, and the self-powered Presonus Eris E5 XT (studio monitors) With speakers, sound-staging was exemplary, and as I briefly mentioned above, well recorded music had a great sense of "immediacy" and "musicality," yet with a very slight elevation of certain frequencies (beginning at around 6000 kHz). But again - keep in mind to allow this amp to warm up/break-in and things will get better as time goes on. Let's face it, there are many "fine" or "good" sounding units out there, but that doesn't mean they have the immediacy and musicality of making you feel like you're at a live performance. Well, this Tube 02 Pro does!!! Of course, an added "no-brainer" qualifier statement is that you should also be using quality components and accessories in your audio chain (DAC, upgraded cables, good amplification, etc.). Just remember that old adage that says, "You can't make chicken salad out of chicken sh_t," if everything else in your audio chain is just so-so. Bass is dynamic and nothing is held back. The midrange and higher frequencies have an almost silky-like quality to them (provided you feed it good audio sources). Imaging, air and depth are all there, to be sure. Now let's talk about the headphone inputs. When you plug in headphones, it automatically shuts off the audio flow to the speakers (I like and prefer that a lot). The headphones that I used included a variety of different HiFiMan planar models on one end, to dynamic units from Phillips, Sennheiser and Koss on the other. The end result was that I found the headphone inputs (audio qualities) to be just a tad elevated in the upper extremes (again from about 6000 kHz upwards). The extra details that you hear through the headphone inputs allow you to hear smaller instruments such as bells, castanets, tambourines, cymbals, and so much more, as they stand out from the rest of the orchestra - when previously, they were hidden among the mix. But this was accomplished by elevating these frequencies, thus making that upper extreme quite noticeable. So the nature of the sound coming from the headphones could be best described as having a distinct V shape, with the upper extremes being elevated at about 6000 kHz and above (again, based on the headphones I used). Overall, after a week of so of use, this FX-Audio Tube 02 Pro Head-amp/Preamp unit really impressed me. It would do perfectly fine as a head-amp or as a preamplifier (especially since it allows you to use two different Aux RCA inputs). The sound qualities compete with the best in this class - and most of this class winds up being a bit more expensive ($100 to around $150 or so, and in some cases higher). Based on it's relatively inexpensive price of $79.95 (at the time of this writing), the design and appearance of the unit, along with its overall sound qualities, I am now giving it 5 stars Now, do keep in mind that like any reviews, all are subjective - and your mileage may vary. My results were based on what I heard, with the gear I heard. Good luck!
Review: Hi-fi headphone amp/preamp with incredible value - Make: Immediately out of the box, you can feel the quality of this little amp with a black matt-finished metal enclosure. An LED on each tube socket shines warm orange glow when the amp is on, which I subjectively love. (The tubes have much dimmer orange glow comparing with the LEDs.) The amp's big volume knob turns smoothly. Feature: It accepts two sources, which can be easily switched by the power button. Sound: This amp sounds beautiful! I mostly listen to classical, jazz or soundtracks. I hear great amount of details with satisfying high and low ends. Violin or soprano sounds brilliant and live while cello sounds sweet and magnetic! There is also sufficient bass so the music feel balanced. I have to say this amp performs quite close to Schiit's Vali 2+, which I have been used for more than 1 year. Given the cost difference ($60 sale vs. $149), this amp's value is incredible! When driving Sony MDR7506 (63 Ohms), 7/8 o'clock is enough for me. (Lowest volume is at around 6:30) When driving Sennheiser HD600 (300 Ohms), 10 o'clock is already quite loud for me. Note max volume is at around 5:30. It will probably smoke the headphones and your ears with max volume. At high gain mode, it sounds a little louder, but it appears unnecessary given the ample output at low gain mode. When the volume is greater than 11 o'clock, I can hear hint of white noises (noticeable, but very little). Remember to keep your phone away from the amp, otherwise you will hear frequent interference. You may certainly roll tubes, but the stock 5725 (GE) tubes are great. The headphone amp is a solid product and I am absolutely happy about the purchase. Recommended!!!

## Features

- TUBE-02 PRO is a Class-A tube headphone amp,which uses 5725 tubes to amplify signal.It has a strong tube flavor,fine tone,and high performance,bringing extremely high-quality listening experience
- Adopt transistors for class A buffer,strong output power can easily drive any kind earphones,,output power up to 850mW.And audiophile-grade coupling capacitors is adopted to td the sound more sweet and transparent
- Has two sets of line outputs,through the tube.The design is novel, and the variant amplification of internal transistor and electron tube is processed by tube output,which solves the trouble of plugging in and out when enthusiasts use multiple sound sources
- It can be used as the Pre-amplifier of all kinds of audio amplifier , active speaker or phono/turntable, and improve the sound quality of audio amplifier or active speaker.The black frosted texture looks simple and elegant，makes it fashionable and attractive, bringing wonderful auditory and visual enjoyment, very suitable for home and desktop audio system
- With high gain mode, the gain can be increased by +2.5dB. The tube can be replaced by 6J1, 6J2 tubes freely (other models are temporarily incompatible),adding much fun and higher playability

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09MFCB3ZH |
| Best Sellers Rank | #104,998 in Electronics ( See Top 100 in Electronics ) #707 in Audio Component Amplifiers |
| Color Name | Black |
| Compatible Devices | DAC, MAC, PHONE, SET-TOP BOX, TABLET PC |
| Connector Type | 6.35mm and 3.5mm Jack, RCA |
| Customer Reviews | 4.3 4.3 out of 5 stars (71) |
| Date First Available | December 10, 2021 |
| Item Weight | 1.54 pounds |
| Item model number | FX AUDIO TUBE02 PRO |
| Material Type | Metal |
| Output Wattage | 6 Watts |
| Power Source | Corded Electric |
| Product Dimensions | 7.87 x 9.84 x 2.76 inches |

## Product Details

- **Brand:** KGUSS
- **Color:** Black
- **Compatible Devices:** DAC, MAC, PHONE, SET-TOP BOX, TABLET PC
- **Material:** Metal
- **Output Wattage:** 6 Watts

## Images

![FX-Audio Tube-02 Pro Tube Headphone Amplifier, Vacuum 5725 Tube Preamp, Mini Hi-Fi Integrated Stereo Class A amp Supports 32-600 ohms of Headphones, for Stereo Amplifier/Active Speaker - Image 1](https://m.media-amazon.com/images/I/51h0L+pAi9L.jpg)

## Questions & Answers

**Q: How about using it as a preamplifier for a phonograph**
A: I use them on my 3 turntables

**Q: Would this work on the DT 880 Pro 250  ohms?**
A: The headphone power output of TUBE-02PRO can support 32-600 Ω, DT880PRO is 250 Ω, it is suitable for use.

**Q: Does the tube glow brighter after the device has been in use for a while?**
A: Having used around 1 1/2 months   I have not noticed the change in brightness of the tubes 
It seems almost the same

**Q: Are you satisfied with the vacuum tubes? Have you tried to replace other vacuum tubes**
A: I am happy with the orig tubes  did not have the chance to change the tubes yet    Maybe someday soon

## Customer Reviews

### ⭐⭐⭐⭐⭐ The FX-Audio Tube 02 Pro - A nice (and inexpensive) Head Amp that punches above its weight (edited)
*by B***N on February 6, 2022*

I've edited my original comments with the adjustments below - edited on 16 February 2022 Before I begin, it is always essential to bear in mind that many of these Asian-made (predominantly Chinese made) Head-amp/preamp designs have virtually the exact same interior layouts and components, yet are often packaged differently with slight (or in some cases, major) modified exterior appearances. And with competition being what it is now-a-days, you can find many US companies periodically doing the same thing. Now enter the FX-Audio Tube 02 Pro - a nicely designed tube/class A head-amp/preamp design. After reading over the design parameters and noticing that it's a fairly new release (with only 2 reviews as of this writing), I elected to pull the trigger on one. When it arrived, I noticed a nicely designed unit with an all-metal design. What caught my eye immediately was that it included both 3.5 MM and 6.5 MM headphone inputs (this as opposed to the many similar competing designs that include only a 3.5 MM input). And what was also a positive is the inclusion of two GE designed 6J1 style tubes. You also have an on/off button (which also serves to select your inputs), along with a volume control knob to the right of the front panel. It also has a 2-gain setting button, and what's even nicer (or convenient) is that the gain settings affect headphones only - not the Preamp section. For example, in most headamps/preamps (that have switchable gain settings), adjustments to the gain also impact the line level outputs to speakers. So this is an added feature to have - that is, gain settings impacting headphones only. What is also unique about this particular model head-amp/preamp design is that it includes two Aux RCA inputs - allowing the connection of two different DAC's, if need be, with the option of selecting either one via the front button. After connecting it, I evaluated this unit using 3 different DAC's (not at the same time) - those being the JDS Labs Atom DAC X, the Topping D10S, and the Schiit Audio Modi 3+. As I usually do, I never begin evaluating any listening sessions until I've let the components warm up a bit. I had the FX-Audio Tube 02 Pro on for 24 hours before I began these evaluations. Interconnect cables used were from World's Best Cables and Blue Jeans Cables, with the USB cables being Audioquest Pearl models running from the DAC's to the USB inputs on a professional level desktop PC. Sound Personality: As can be expected, this is a true tube unit, and it imparts a warm, yet very dynamic and detailed sound quality - however, it is just a tad than comparable tube amps in the upper registers. With some DAC's that may have a dry personality, the Tube 02 Pro warms things up and adds a musicality that the DAC (when listening to alone) often lacks. Do keep in mind that other similar tube head-amps/preamps - such as the Douk Audio P1, or the X-Duoo MT-602 - have the same effect. One nice thing about the Tube 02 Pro is that it accurately portrays the sonic signature of different DAC units. If you have a bright sounding DAC, you will experience this added brightness through the Tube 02 Pro. The tubes in the Tube 02 Pro do not run hot at all, especially when you consider other tubed units that use different types of tubes. They never felt warmer than warm - no matter how long I've had the unit on. As an aside, the one tube in the Schiit Vali 2+ runs quite hot (like a heater) as an example. The tubes do light up more brightly in the Tube 02 Pro (at least in this enclosure) because they stick out more towards the top, whereas with competing units, the tubes are more recessed into the enclosure. And because of this design aspect in the Tube 02 Pro, the tubes are easier to remove and switch out (tube rolling). I must add that the stock GE tubes that came with this unit sound superb, and unless you are fixated on wanting to tube roll, you should be quite happy with the result. Now normally, when using these particular GE tubes, the audio typically balances out nicely, with a nice, lush sound. The very slight brightness that I alluded to indicates that the solid end of things has been calibrated to providethe best of both worlds (solid state and tubes). My initial listening sessions were conducted using a variety of speakers connected to a Cambridge AX25 Class AB integrated amp, followed by the Aiyima A07 and A08 class D models. I finished things out with the exemplary Fosi HD-A1 class AB amplifier. The speakers, I then eventually settled upon, were the Wharfedale D320's with a Mackie 8" Powered subwoofer under the desk. I listened to everything on a desktop, near-field environment. Speakers used in this evaluation included the aforementioned Warfedale D320, the KEF Q150, and the self-powered Presonus Eris E5 XT (studio monitors) With speakers, sound-staging was exemplary, and as I briefly mentioned above, well recorded music had a great sense of "immediacy" and "musicality," yet with a very slight elevation of certain frequencies (beginning at around 6000 kHz). But again - keep in mind to allow this amp to warm up/break-in and things will get better as time goes on. Let's face it, there are many "fine" or "good" sounding units out there, but that doesn't mean they have the immediacy and musicality of making you feel like you're at a live performance. Well, this Tube 02 Pro does!!! Of course, an added "no-brainer" qualifier statement is that you should also be using quality components and accessories in your audio chain (DAC, upgraded cables, good amplification, etc.). Just remember that old adage that says, "You can't make chicken salad out of chicken sh_t," if everything else in your audio chain is just so-so. Bass is dynamic and nothing is held back. The midrange and higher frequencies have an almost silky-like quality to them (provided you feed it good audio sources). Imaging, air and depth are all there, to be sure. Now let's talk about the headphone inputs. When you plug in headphones, it automatically shuts off the audio flow to the speakers (I like and prefer that a lot). The headphones that I used included a variety of different HiFiMan planar models on one end, to dynamic units from Phillips, Sennheiser and Koss on the other. The end result was that I found the headphone inputs (audio qualities) to be just a tad elevated in the upper extremes (again from about 6000 kHz upwards). The extra details that you hear through the headphone inputs allow you to hear smaller instruments such as bells, castanets, tambourines, cymbals, and so much more, as they stand out from the rest of the orchestra - when previously, they were hidden among the mix. But this was accomplished by elevating these frequencies, thus making that upper extreme quite noticeable. So the nature of the sound coming from the headphones could be best described as having a distinct V shape, with the upper extremes being elevated at about 6000 kHz and above (again, based on the headphones I used). Overall, after a week of so of use, this FX-Audio Tube 02 Pro Head-amp/Preamp unit really impressed me. It would do perfectly fine as a head-amp or as a preamplifier (especially since it allows you to use two different Aux RCA inputs). The sound qualities compete with the best in this class - and most of this class winds up being a bit more expensive ($100 to around $150 or so, and in some cases higher). Based on it's relatively inexpensive price of $79.95 (at the time of this writing), the design and appearance of the unit, along with its overall sound qualities, I am now giving it 5 stars Now, do keep in mind that like any reviews, all are subjective - and your mileage may vary. My results were based on what I heard, with the gear I heard. Good luck!

### ⭐⭐⭐⭐⭐ Hi-fi headphone amp/preamp with incredible value
*by M***M on January 9, 2022*

Make: Immediately out of the box, you can feel the quality of this little amp with a black matt-finished metal enclosure. An LED on each tube socket shines warm orange glow when the amp is on, which I subjectively love. (The tubes have much dimmer orange glow comparing with the LEDs.) The amp's big volume knob turns smoothly. Feature: It accepts two sources, which can be easily switched by the power button. Sound: This amp sounds beautiful! I mostly listen to classical, jazz or soundtracks. I hear great amount of details with satisfying high and low ends. Violin or soprano sounds brilliant and live while cello sounds sweet and magnetic! There is also sufficient bass so the music feel balanced. I have to say this amp performs quite close to Schiit's Vali 2+, which I have been used for more than 1 year. Given the cost difference ($60 sale vs. $149), this amp's value is incredible! When driving Sony MDR7506 (63 Ohms), 7/8 o'clock is enough for me. (Lowest volume is at around 6:30) When driving Sennheiser HD600 (300 Ohms), 10 o'clock is already quite loud for me. Note max volume is at around 5:30. It will probably smoke the headphones and your ears with max volume. At high gain mode, it sounds a little louder, but it appears unnecessary given the ample output at low gain mode. When the volume is greater than 11 o'clock, I can hear hint of white noises (noticeable, but very little). Remember to keep your phone away from the amp, otherwise you will hear frequent interference. You may certainly roll tubes, but the stock 5725 (GE) tubes are great. The headphone amp is a solid product and I am absolutely happy about the purchase. Recommended!!!

### ⭐⭐⭐⭐⭐ Excellent value; try it with 6k4 tubes
*by P***O on June 18, 2023*

I won't repeat what has been written in the previous thoughtful reviews of this unit, other than to say that it is a great value, provides great warmth and dynamics, punching way above its price point. The provided GE tubes are excellent and provide a clean sound. If one wants even more "tube-y" goodness, I would suggest rolling some inexpensive Chinese 6k4 tubes. (I know, I know, but they just sound really nice!) They are super inexpensive (I bought 4 on AliExpress for about $10) and will provide an engaging sonic experience, for less than the price of a cheeseburger... The unit overall is very good, but not perfect. My sample had the high-gain button slightly mute the left channel. However, the unit drove my Hifiman HE400 planar headphones just fine on the low-gain setting, so I still gave it a five-star rating.

## Frequently Bought Together

- FX-Audio Tube-02 Pro Tube Headphone Amplifier, Vacuum 5725 Tube Preamp, Mini Hi-Fi Integrated Stereo Class A amp Supports 32-600 ohms of Headphones, for Stereo Amplifier/Active Speaker
- Tan QY 2RCA to 2RCA Cable 3Ft, Gold-Plated 2 RCA Male to 2 RCA Male Stereo Audio Cable for Home Theater, HDTV, Gaming Consoles, Hi-Fi Systems (3Ft/1M)
- Monoprice 1.5ft Premium 2 RCA Plug/2 RCA Plug M/M 22AWG Cable - Black

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-03-01*