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Returns
Eligible for Return, Refund or Replacement within 30 days of receipt
Eligible for Return, Refund or Replacement within 30 days of receipt
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  • VIDEO
  • Douk Audio ST-01 PRO 200W Bluetooth Amplifier, 2 Channel Vacuum Tube Power Amp with USB DAC/Coaxial Optical Inputs/VU Meter/Treble Bass Control for Home Theater/Stereo Speakers (Upgrade Version)
  • Douk Audio ST-01 PRO 200W Tube Bluetooth AmpDoukAudio

Douk Audio ST-01 PRO 200W Bluetooth Amplifier, 2 Channel Vacuum Tube Power Amp with USB DAC/Coaxial Optical Inputs/VU Meter/Treble Bass Control for Home Theater/Stereo Speakers (Upgrade Version)

4.5 out of 5 stars (445)
To see product details, add this item to your cart. You can always remove it later.

About this item

  • Full Upgraded Version of ST-01: 1. Supports U-disk input to play lossless formats music. 2. Add sensitivity adjustment of VU meter on its bottom, easy to set and match better with different input signals. 3. Add three decorative golden circles around tubes and VU meter, looks more exquisite and luxury.
  • Unique and amazing combination: With VU meter into whole in such a mini size, the pointer dancing in the warm light with strong vintage feelings when enjoy HiFi music, dynamically decorates the audio system space.
  • HiFi clear sound with tone control: resonable circuit and concise wiring, adopts vacuum tubes to soften the sound and filter out the digital feelings, sounds warm and sweet without noise. Also with treble and bass knobs to adjust one's own preferable sound styles, presents HiFi music with rousing highs and deep lows.
  • Strong output power and special AUX output: use TI's classic power amp IC, each channel can output 100W(4Ω) and easily to drive all 3-8Ω passive speakers, adds 3.5mm AUX output easy to connect another amplifier or active speaker / subwoofer to build multiple channel system and enjoy wonderful home theater experience.
  • With multiple digital audio inputs: Bluetooth 5.0 / USB / Coaxial / Optical / stereo RCA, compatible with most audio device such as phones, computers, tablets, TVs, TV, CD players etc. The perfect combination of DAC and amplifier, very suitale for audiophiles who have various audio devices.
› See more product details

Additional details

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Previous set of slides

  4. Sustainability features

    This product has sustainability features recognized by trusted certifications.
    Carbon impact
    Carbon emissions from the lifecycle of this product were measured, reduced and offset.
    As certified by
    ClimatePartner certified

    ClimatePartner certified

    The ClimatePartner certified product label confirms that a product meets the requirements for the five steps in climate action including calculating carbon footprints, setting reduction targets, implementing reductions, financing climate projects and communicating transparently to continuously reducing emissions.

    Certification Number

    ZK5TB8

    Climate Pledge Friendly

    Discover more products with sustainability features.Learn more
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From the brand

Previous page

  2. Douk Audio & Nobsound

    Estabilshed in 2013, Douk Audio & Nobsound is created by a group of enthusiastic music fans and professional audio experts.

    We design and make various audio equipments including amplifier, phono preamp, headphone amp, DAC, audio switch and so on.

    Our aim is "Make Hi-Fi Affordable" !

  3. endorsement
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    Nobsound HiFi 2.1 Channel Bluetooth 5.0 Power Amplifier Board Case Stereo Subwoofer Amp

    Bluetooth Digital Amplifier

  6. Douk Audio ST-01 PRO 200W Bluetooth Amplifier, 2 Channel Vacuum Tube Power Amp with USB DAC/Coaxi...
    Douk Audio ST-01 200W Bluetooth Amplifier, 2 Channel Vacuum Tube Power Amp with USB DAC/Coaxial O...
    HiFi Stereo Bluetooth 5.0 Vacuum Tube Amplifier MM Phono Amp for Turntables 320W
    Nobsound B100 Bluetooth 5.0 Tube Amplifier USB DAC Coax/Opt Integrated Power Amp

    Bluetooth Tube Amplifier

  7. ​Douk Audio BS-1 Bass Shaker: 50W High Power Tactile Subwoofer Transducer for Home Theater, Car A...
    ​Douk Audio BS-1 Bass Shaker: 50W High Power Tactile Subwoofer Transducer for Home Theater, Car A...
    ​Douk Audio BS-1 Bass Shaker: 50W High Power Tactile Subwoofer Transducer for Home Theater, Car A...
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    Douk Audio BS-1 Bass Shaker

  8. VU3 Audio Switch with VU Meter

  9. B1 FM Receiver

Next page

Product information

Technical Details

Manufacturer ‎Douk Audio
Place of Business ‎Room 1329 wangCheng Building;Longhua street， Longhua new district； 51800g shenzhen， Guangdong
Part number ‎ST-01 PRO
Item Weight ‎1.33 kg
Product Dimensions ‎11.51 x 9.75 x 5.41 cm; 1.33 kg
Item model number ‎ST-01 PRO
Colour ‎Upgrade Pro Version
Material ‎Glass, Metal, Plastic, Electrical Components
Voltage ‎18 Volts (DC)
Item Package Quantity ‎1
Mounting Type ‎Freestanding
Specifications ‎FCC
Included components ‎Bluetooth Tube Amp
Batteries Included? ‎No
Batteries Required? ‎No
Length ‎4.53 inches
Width ‎3.84 inches
Height ‎2.13 inches

Additional Information

ASIN B0BBRBWW36
Customer Reviews
4.5 out of 5 stars (445)

4.5 out of 5 stars
鶹 Rank
Date First Available Aug. 31 2022

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Douk Audio ST-01 PRO 200W Bluetooth Amplifier, 2 Channel Vacuum Tube Power Amp with USB DAC/Coaxial Optical Inputs/VU Meter/Treble Bass Control for Home Theater/Stereo Speakers (Upgrade Version)

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Product details

  • Product Dimensions ‏ : ‎ 11.51 x 9.75 x 5.41 cm; 1.33 kg
  • Date First Available ‏ : ‎ Aug. 31 2022
  • Manufacturer ‏ : ‎ Douk Audio
  • Place of Business ‏ : ‎ Room 1329 wangCheng Building;Longhua street， Longhua new district； 51800g shenzhen， Guangdong
  • ASIN ‏ : ‎ B0BBRBWW36
  • Item model number ‏ : ‎ ST-01 PRO
  • Country of origin ‏ : ‎ China
  • 鶹 Rank: #5,772 in Electronics (See Top 100 in Electronics)
  • Customer Reviews:
    4.5 out of 5 stars (445)

Product Description

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

Douk Audio ST-01 PRO Bluetooth Tube Amplifier

Merchant video

Technical Specifications

Audio input Bluetooth / USB (PC-USB) / Coaxial / Optical / RCA / U-disk (only ST-01 PRO supported)
Audio output Banana speaker jacks / 3.5mm AUX
Max output power 100W+100W (4Ω)
Matched impedance 3-8Ω
Sampling rate supported USB input: 96KHz/24Bit, Bluetooth input: 48KHz/24Bit, COAX/OPT inputs: 192KHz/24Bit
Supported formats of U-disk MP3 / WAV / WMA / FLAC / APE
Max capacity of U-disk 64G
Treble/Bass adjustment range ±6
System PC-USB supported XP/W7/W8/W10/MAC/ Linux
Frequency response 20-20(±1)
S/N ratio ≥98
THD 0.07%
Working voltage DC 18-30V
Dimensions(W*D*H) 115*98*54mm / 4.53*3.86*2.13in
Net weight 661g / 1.46lb

  • The upgraded ST-01 PRO adds U-disk input for lossless formats, adjustable VU meter sensitivity for signal matching, and decorative gold rings for a premium look. Enhances usability and aesthetics.

  • It dynamically dances to music under warm lighting, creating vintage vibes and enhancing room decor. Perfect for immersive HiFi experiences.

  • Yes! Use treble/bass controls (±6) and vacuum tubes to warm audio, eliminating digital harshness. Ideal for personalized, sweet-sounding HiFi with deep lows and clear highs.

  • Drives all 3-8Ω passive speakers with 200W total power. Includes AUX output for connecting subs or additional amps, enabling easy multi-channel home theater setups.

  • Compatible with phones, PCs, TVs, and more via Bluetooth 5.0, USB, coaxial/optical, or RCA. Supports high-res audio up to 192KHz/24Bit for audiophiles.

Douk Audio ST-01 PRO

Douk Audio & Nobsound

Bluetooth Tube Amp

Type:

Bluetooth Tube Amp

2.0/2.1

Channel:

2.0/2.1

BT/RCA/USB/OPT/UDisk

Inputs:

BT/RCA/USB/OPT

Speakers+Active SUB

Outputs:

Speakers+Active SUB

100W x2

Power:

100W x2

Tone Control:

Bluetooth Tube Amp

Type:

Bluetooth Amplifier

2.0/2.1

Channel:

2.0/2.1

BT/RCA/USB/OPT/UDisk

Inputs:

Bluetooth/RCA/Udisk

Speakers+Active SUB

Outputs:

Speakers+Active SUB

100W x2

Power:

160W x2

Tone Control:

Bluetooth Tube Amp

Type:

4-CH Bluetooth Amp

2.0/2.1

Channel:

4.0

BT/RCA/USB/OPT/UDisk

Inputs:

Bluetooth/RCA/Udisk

Speakers+Active SUB

Outputs:

Speakers

100W x2

Power:

50W x4

Tone Control:

Bluetooth Tube Amp

Type:

Bluetooth&Phono Amp

2.0/2.1

Channel:

2.0/2.1

BT/RCA/USB/OPT/UDisk

Inputs:

BT/RCA/MM Turntable

Speakers+Active SUB

Outputs:

Speakers+Active SUB

100W x2

Power:

160W x2

Tone Control:

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Customer reviews

4.5 out of 5 stars
445 global ratings

Customers say

Customers find this electronic component amplifier delivers awesome amazing sound that is warm sounding. They describe it as a great little Class D amp and an excellent product. The amplifier has an adorable looking appearance that customers appreciate. Performance receives praise, with users noting outstanding performance and that it works well. The Bluetooth connectivity works great for both music and movies. Customers also like the tone control and are happy with the build quality.
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38 customers mention sound quality, 32 positive, 6 negative
Customers appreciate the sound quality of this electronic component amplifier. They describe the sound as awesome and amazing, with a warm tone. The amplifier gets loud and produces clear speech when watching movies and shows. Users note the good frequency range and treble quality.
Good little amp. Great sound. I wish it had a sub out connection.Read more
...When it is working it sounds great. It is running two in wall 10" mids and fills the room with sound without having to up the volume....Read more
...Fills our very large living space very well with clean and warm sound. The AppleTV remote adapted to it as well for volume control....Read more
I’m impressed with the quality of sound and ease of setup and use!Read more
22 customers mention quality, 21 positive, 1 negative
Customers appreciate the quality of this electronic component amplifier. They describe it as a great little Class D amp and an excellent product. Users find it amazing and consider it real neat equipment, praising it as a great little system and great little tube.
Great little amp. Sounds great, lots of input options and has tone controls. Remote included is well made and works perfectly.Read more
Great little Class D amp. I replaced the tubes with the Riverstone tubes and I couldn't be happier.Read more
Great quality for a small tube amp. The tube upgraded to JAN 5725W. It sounds better than the tubes that come with it.Read more
Good little amp. Great sound. I wish it had a sub out connection.Read more
10 customers mention appearance, 10 positive, 0 negative
Customers appreciate the amplifier's appearance, describing it as looking great and calling it a beautiful little amp.
Sounds great. looks great. currently I am having some BT connectivity issues....Read more
...As long as the style is to your liking, you'll like having it on your desk/shelf.Read more
...Both worked perfect. Beautiful little amp and looks fantastic with the copper tone accents.Read more
Little beauty! Very solidly built. Wonderful controls. Very warm sound....Read more
10 customers mention performance, 8 positive, 2 negative
The electronic component amplifier delivers outstanding performance and works well with various applications. Customers find it very capable and note that it drives components effectively. The amplifier works great with multiple computers and performs very well overall.
...Remote included is well made and works perfectly.Read more
...It is very capable and produces clear speech when watching movies and shows....Read more
Outstanding performanceRead more
The input for fiber optics does not workRead more
8 customers mention bluetooth connectivity, 6 positive, 2 negative
Customers find the electronic component amplifier's Bluetooth connectivity works great for both music and movies. They report that syncing from their phone is super easy and that Bluetooth setup is straightforward. The Bluetooth range is described as amazing, and the device can connect to USB drives for continuous music playback.
Sounds great. looks great. currently I am having some BT connectivity issues....Read more
8 customers mention tone control, 7 positive, 1 negative
Customers appreciate the tone control features of this electronic component amplifier. They find the tone adjustment dials quite nice and handy for bass and treble control. The amplifier offers simple dials for adjusting these settings and allows users to create presets.
...Device feels sturdy and well built with nice feeling adjustment knobs. Remote works. I only used the optical input and Bluetooth connection so far....Read more
Great little amp. Sounds great, lots of input options and has tone controls. Remote included is well made and works perfectly.Read more
Little beauty! Very solidly built. Wonderful controls. Very warm sound....Read more
...really good improvement from my previous amp. Controls are easy. Aesthetics are excellent. All full stars for those aspects....Read more
5 customers mention build quality, 5 positive, 0 negative
Customers appreciate the build quality of this electronic component amplifier. They describe it as well built and a solid little amp.
For the price you can’t beat this little thing of beauty Well made, great sound from this little ampRead more
Little beauty! Very solidly built. Wonderful controls. Very warm sound....Read more
...Sound is crisp and full. Great bass and treble. Device feels sturdy and well built with nice feeling adjustment knobs. Remote works....Read more
...old farts do from the 70’s this is some real neat equipment and made pretty good with good stuff inside....Read more
Capable Budget Amp
5 out of 5 stars
Capable Budget Amp
After 5 months of use, I can confirm this is a nice little 2.1 amp. I currently have it set up with one on my TV set to run a 2.1 set up. It is very capable and produces clear speech when watching movies and shows. If you are wondering if you should run a 2.1 or a soundbar, I would highly recommend running a 2.1 with this amp instead of wasting money on a set of very expansive soundbar. It is current set up with a pair of Jamo S426 Towers and Edifier T5s Subwoofer.
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Top reviews from Canada

  • Electron
    5.0 out of 5 stars Beautiful sound with unique look.
    Reviewed in Canada on October 18, 2025
    Verified Purchase
    Great little amp. Sounds great, lots of input options and has tone controls. Remote included is well made and works perfectly.
    Helpful
     Report
  • Kenny Wong
    5.0 out of 5 stars Capable Budget Amp
    Reviewed in Canada on January 13, 2026
    Verified Purchase
    After 5 months of use, I can confirm this is a nice little 2.1 amp.

    I currently have it set up with one on my TV set to run a 2.1 set up. It is very capable and produces clear speech when watching movies and shows. If you are wondering if you should run a 2.1 or a soundbar, I would highly recommend running a 2.1 with this amp instead of wasting money on a set of very expansive soundbar.

    It is current set up with a pair of Jamo S426 Towers and Edifier T5s Subwoofer.
    Customer image
    Kenny Wong
    5.0 out of 5 stars
    Capable Budget Amp

    Reviewed in Canada on January 13, 2026
    After 5 months of use, I can confirm this is a nice little 2.1 amp.

    I currently have it set up with one on my TV set to run a 2.1 set up. It is very capable and produces clear speech when watching movies and shows. If you are wondering if you should run a 2.1 or a soundbar, I would highly recommend running a 2.1 with this amp instead of wasting money on a set of very expansive soundbar.

    It is current set up with a pair of Jamo S426 Towers and Edifier T5s Subwoofer.
    Images in this review
    Customer image
    4 people found this helpful
    Helpful
     Report
  • Drew D.
    5.0 out of 5 stars Wow
    Reviewed in Canada on February 14, 2026
    Verified Purchase
    For the price you can’t beat this little thing of beauty
    Well made, great sound from this little amp
    Helpful
     Report
  • Gordon Rempel
    4.0 out of 5 stars Wow!
    Reviewed in Canada on November 23, 2023
    Verified Purchase
    Took a chance on this when my giant home receiver finally died. Running our Apple TV into it and playing through a pair of Klipsch tower speakers. Great for movies and music alike.
    Fills our very large living space very well with clean and warm sound. The AppleTV remote adapted to it as well for volume control.
    I actually had to install an attenuator, as it didn’t get quiet enough for conversation BG if we were too close to the speakers. Has a quirk where it sometimes doesn’t want to wake up after muting with the AppleTV remote, but it works again after turning it off and on again with the supplied remote or on the actual amp.
    I’d recommend and would consider another if I needed it in a different situation.
    4 people found this helpful
    Helpful
     Report
  • James
    5.0 out of 5 stars Great starter Audiophile collectable!
    Reviewed in Canada on August 7, 2024
    Verified Purchase
    The media could not be loaded.
    I have seen these little amps for awhile and I was curious how good one of these guys could be since I have one of the most expensive stereo’s from the early 70’s still working and in great shape. It has vacuum tubes and that always intrigued me the aesthetic goes with my Klipsch speakers also but once I powered it up and started playing my benchmark jazz CD I was awe of what this little thing can do! Sound it great like I said I have an old stereo here the beats most anything out there audiophile wise! So to have real good clarity and punch out of something delivering half it’s power to 8ohm speakers and driving them very well is impressive! I have my EQ at 70% output and I have great sounding tunes. I did more digging one these but it has a texas Instruments chip in it that makes ton of power depending on what power supply you use 24 or 48 volt it has capability for more! If you are techie like me. I am happy with this amp for what it is if you understand audio the way us old farts do from the 70’s this is some real neat equipment and made pretty good with good stuff inside. Oh yeah ditch the the tubes it comes with find old Ge military spec ones they sound better. Jan 5654W vacuum tubes
    Customer image
    James
    5.0 out of 5 stars
    Great starter Audiophile collectable!

    Reviewed in Canada on August 7, 2024
    I have seen these little amps for awhile and I was curious how good one of these guys could be since I have one of the most expensive stereo’s from the early 70’s still working and in great shape. It has vacuum tubes and that always intrigued me the aesthetic goes with my Klipsch speakers also but once I powered it up and started playing my benchmark jazz CD I was awe of what this little thing can do! Sound it great like I said I have an old stereo here the beats most anything out there audiophile wise! So to have real good clarity and punch out of something delivering half it’s power to 8ohm speakers and driving them very well is impressive! I have my EQ at 70% output and I have great sounding tunes. I did more digging one these but it has a texas Instruments chip in it that makes ton of power depending on what power supply you use 24 or 48 volt it has capability for more! If you are techie like me. I am happy with this amp for what it is if you understand audio the way us old farts do from the 70’s this is some real neat equipment and made pretty good with good stuff inside. Oh yeah ditch the the tubes it comes with find old Ge military spec ones they sound better. Jan 5654W vacuum tubes
    Images in this review
    Customer image
    12 people found this helpful
    Helpful
     Report
  • Mark In Montreal
    5.0 out of 5 stars Great little amp
    Reviewed in Canada on March 18, 2025
    Verified Purchase
    Little beauty! Very solidly built. Wonderful controls. Very warm sound. I have this amp paired with a pair of vintage BBC Rogers LS3/5a’s and a Cambridge Minx 300 sub. It’s a great combination with the amp having just enough power to push the system to fill a room. Highly recommend.
    4 people found this helpful
    Helpful
     Report
  • robert rousselle
    5.0 out of 5 stars for the price cant go wrong
    Reviewed in Canada on February 27, 2026
    Verified Purchase
    super sound , added equalizer , driving klipsch rm 51 bock shelve , cant say there is any wrong with this little amp , it arrived with 5625 tunes not 6k4 , more bass clean sound fills my living more . you wont be disappointed .
    Helpful
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  • The Buyer
    3.0 out of 5 stars Crank the highs
    Reviewed in Canada on July 9, 2025
    Verified Purchase
    Ok.. warm sounding. Very flat, lacks the high sibilants, checked over a few different speakers.
    2 people found this helpful
    Helpful
     Report

Top reviews from other countries

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  • Kapila Patikiriachchige
    5.0 out of 5 stars Vacuum Tube Amp
    Reviewed in Australia on June 23, 2024
    Verified Purchase
    The media could not be loaded.
    This little Tube Amplifier’s sound quality is amazing. I connect my HiFi system equalizer and CD player to this Amp, it’s handling the Quality of sound. Very impressed with this Tube Amplifier. Recommend it.
    Customer image
    Kapila Patikiriachchige
    5.0 out of 5 stars
    Vacuum Tube Amp

    Reviewed in Australia on June 23, 2024
    This little Tube Amplifier’s sound quality is amazing. I connect my HiFi system equalizer and CD player to this Amp, it’s handling the Quality of sound. Very impressed with this Tube Amplifier. Recommend it.
    Images in this review
    Customer image Customer image
    Report
  • Benjamin Sullivan
    5.0 out of 5 stars Impressive performance for such a small and reasonably priced amp!
    Reviewed in the United States on November 12, 2025
    Verified Purchase
    This is a review of the Douk Audio ST-01 PRO 200W Bluetooth Amplifier.

    I am a low grade audiophile by my own description--I have spent quite a bit of time listening carefully to the same few tracks on a whole range of components over the last 25 years or so. Engineering background so I take a very pragmatic approach--if I can hear a difference myself then I will consider the costs for better gear across the board. I can't blow money on anything and I don't like to be wasteful so I do a fair bit of research before I buy. This little Douk tube amp has really impressed me! I had an old Denon AVR-5700 home theater receiver that had been demoted over the years to just providing sound for our computer--headphone jack outlet from the computer into the receiver, two passive NHT SB-3 speakers driven by the Denon receiver, and subwoofer line out to one passive NHT W2 subwoofer driven by a dedicated NHT amp. When the Denon died, I needed something to power the same speakers and sub but that's it, just 2.1 channels of sound and not audiophile quality to the Nth degree. There are a whole bunch of these tiny devices out there, I liked this one for its combination of price point, tubes for the two speakers, and subwoofer line out to go to my same NHT dedicated amp for the subwoofer.

    The size is quite amazing, others have shown the same sort of big ol' receiver that was replaced by this tiny cube--it's really just 4.5"W x 3"H x 6.5"D (from the wall to the front of the dials after I have all the connectors installed). The audio power is also impressive. The claims of 200 W/channel are debatable (another review has very solid points about the power supply and the output claims) and that also will depend on what speakers you are using, where their Ohm ratings will influence the power output. Our computer is in a modest home office sized room, about 10'x12' or so, my two SB-3 speakers are 8 ohms being driven directly by the Douk amplifier via the speaker terminals, and the subwoofer is using the 3.5mm line out to the sub amp, so this little device IS powering my speakers but NOT my subwoofer. When I set it up and started testing with my same old tracks, made some adjustments between the volume on the computer and the volume dial on the Douk, I found that this tiny box can rock this room just fine! I'm impressed with how much bass the Douk pushes to the speakers, which have a very good frequency range themselves, which is nice for most musical circumstances anyway where bass guitars, deeper drum beats, and lower ranges in classical performances get very nicely reproduced. The tone adjustment dials on the Douk are quite nice, recognizing that they are just the two simple dials for bass and treble, so I don't expect them to get any more complicated than that anyway. Between the digital equalizer window on my computer which has 12 bands to work with and the two dials on the Douk, there is quite a bit of refinement you can make to match your personal preference for the types of music you listen to and which parts of that music you prefer to dampen or boost. It's basic but it works well.

    Like another couple of reviewers, I too received tubes that are much smaller than those shown in the photos on the 鶹 product page. However, with a little research it seems that the smaller tubes are most likely an improvement from those pictured. I don't know exactly what those larger tubes are--the product page does suffer from missing details like which tubes are included--but the ones I received are legit General Electric JAN 5725W tubes with "MADE IN USA" printed on the glass tubes themselves, which are mil spec quality (which means they are made to very high quality standards to be accepted for military purposes, back when the military was still using lots of tubes). These are usually offered as an upgrade set of tubes for this Douk so I don't know what happened there but I believe the smaller 5725's are top quality for this level of device. They sound terrific to my ear so I'm delighted with them. I have read way too many subjectively written reviews of the feel and warmth and crispness and all sorts of other floral terms describing how tube amps sound compared to modern transistor-based amps. I don't have two different devices side by side to switch back and forth against each other with every other part of the system being identical so I can legitimately compare point for point the tube am to a transistor amp. Suffice it to say that compared to all of my other experience with transistor amps over these years, this little tube dude sounds fantastic! I haven't had any tube amps before so I will have to see how it performs over time, with things like burn in and eventual failure being known factors, but I don't have the tube testing equipment to test exactly when those thresholds will be crossed, so I'm just gonna enjoy the sound until I hear something wrong.

    The little ol' analog levels dial with the meter jumping around is quite charming as well. It does give you some useful information, just a basic glimpse into how much or how little you are pushing the power. That feature is a nice little throwback to those old times of analog stereo gear back in the day. And while all you young whippersnappers giggle, you'll also notice how vinyl albums and record players are booming again. There truly is some meaningful, warm charm to having a little visual dial bouncing along to the music with you while you tap your foot and try to concentrate on whatever important task you were supposed to be working on while you jam out, right? Totally gnarly dude (yep, I was in high school in the early 80's, for better and for worse).

    I am just using the RCA inputs from the computer so I don't have any comments on the other input types that the unit offers. Based on what specs they have provided in terms of formats and frequency ranges, and on my listening experience now with this unit, I would guess that those other input source feeds should work just as well as the RCA input, but that is just a guess.

    For the money, I am delighted with this Douk, if the need arises I would happily buy another one. Hope that's a helpful review, and hope you get to enjoy your favorite music again like I am!
    Customer image
    Benjamin Sullivan
    5.0 out of 5 stars
    Impressive performance for such a small and reasonably priced amp!

    Reviewed in the United States on November 12, 2025
    This is a review of the Douk Audio ST-01 PRO 200W Bluetooth Amplifier.

    I am a low grade audiophile by my own description--I have spent quite a bit of time listening carefully to the same few tracks on a whole range of components over the last 25 years or so. Engineering background so I take a very pragmatic approach--if I can hear a difference myself then I will consider the costs for better gear across the board. I can't blow money on anything and I don't like to be wasteful so I do a fair bit of research before I buy. This little Douk tube amp has really impressed me! I had an old Denon AVR-5700 home theater receiver that had been demoted over the years to just providing sound for our computer--headphone jack outlet from the computer into the receiver, two passive NHT SB-3 speakers driven by the Denon receiver, and subwoofer line out to one passive NHT W2 subwoofer driven by a dedicated NHT amp. When the Denon died, I needed something to power the same speakers and sub but that's it, just 2.1 channels of sound and not audiophile quality to the Nth degree. There are a whole bunch of these tiny devices out there, I liked this one for its combination of price point, tubes for the two speakers, and subwoofer line out to go to my same NHT dedicated amp for the subwoofer.

    The size is quite amazing, others have shown the same sort of big ol' receiver that was replaced by this tiny cube--it's really just 4.5"W x 3"H x 6.5"D (from the wall to the front of the dials after I have all the connectors installed). The audio power is also impressive. The claims of 200 W/channel are debatable (another review has very solid points about the power supply and the output claims) and that also will depend on what speakers you are using, where their Ohm ratings will influence the power output. Our computer is in a modest home office sized room, about 10'x12' or so, my two SB-3 speakers are 8 ohms being driven directly by the Douk amplifier via the speaker terminals, and the subwoofer is using the 3.5mm line out to the sub amp, so this little device IS powering my speakers but NOT my subwoofer. When I set it up and started testing with my same old tracks, made some adjustments between the volume on the computer and the volume dial on the Douk, I found that this tiny box can rock this room just fine! I'm impressed with how much bass the Douk pushes to the speakers, which have a very good frequency range themselves, which is nice for most musical circumstances anyway where bass guitars, deeper drum beats, and lower ranges in classical performances get very nicely reproduced. The tone adjustment dials on the Douk are quite nice, recognizing that they are just the two simple dials for bass and treble, so I don't expect them to get any more complicated than that anyway. Between the digital equalizer window on my computer which has 12 bands to work with and the two dials on the Douk, there is quite a bit of refinement you can make to match your personal preference for the types of music you listen to and which parts of that music you prefer to dampen or boost. It's basic but it works well.

    Like another couple of reviewers, I too received tubes that are much smaller than those shown in the photos on the 鶹 product page. However, with a little research it seems that the smaller tubes are most likely an improvement from those pictured. I don't know exactly what those larger tubes are--the product page does suffer from missing details like which tubes are included--but the ones I received are legit General Electric JAN 5725W tubes with "MADE IN USA" printed on the glass tubes themselves, which are mil spec quality (which means they are made to very high quality standards to be accepted for military purposes, back when the military was still using lots of tubes). These are usually offered as an upgrade set of tubes for this Douk so I don't know what happened there but I believe the smaller 5725's are top quality for this level of device. They sound terrific to my ear so I'm delighted with them. I have read way too many subjectively written reviews of the feel and warmth and crispness and all sorts of other floral terms describing how tube amps sound compared to modern transistor-based amps. I don't have two different devices side by side to switch back and forth against each other with every other part of the system being identical so I can legitimately compare point for point the tube am to a transistor amp. Suffice it to say that compared to all of my other experience with transistor amps over these years, this little tube dude sounds fantastic! I haven't had any tube amps before so I will have to see how it performs over time, with things like burn in and eventual failure being known factors, but I don't have the tube testing equipment to test exactly when those thresholds will be crossed, so I'm just gonna enjoy the sound until I hear something wrong.

    The little ol' analog levels dial with the meter jumping around is quite charming as well. It does give you some useful information, just a basic glimpse into how much or how little you are pushing the power. That feature is a nice little throwback to those old times of analog stereo gear back in the day. And while all you young whippersnappers giggle, you'll also notice how vinyl albums and record players are booming again. There truly is some meaningful, warm charm to having a little visual dial bouncing along to the music with you while you tap your foot and try to concentrate on whatever important task you were supposed to be working on while you jam out, right? Totally gnarly dude (yep, I was in high school in the early 80's, for better and for worse).

    I am just using the RCA inputs from the computer so I don't have any comments on the other input types that the unit offers. Based on what specs they have provided in terms of formats and frequency ranges, and on my listening experience now with this unit, I would guess that those other input source feeds should work just as well as the RCA input, but that is just a guess.

    For the money, I am delighted with this Douk, if the need arises I would happily buy another one. Hope that's a helpful review, and hope you get to enjoy your favorite music again like I am!
    Images in this review
    Customer image Customer image
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  • Ron
    5.0 out of 5 stars I love it
    Reviewed in Mexico on June 29, 2025
    Verified Purchase
    Great sound
    Report
  • Boris Pokos
    5.0 out of 5 stars Excellent product!
    Reviewed in Australia on May 23, 2023
    Verified Purchase
    It is amazing what a nice sound this little thing can provide. Especially I like warmth of the sound (kind of softness) produced by tubes. Pair it with Polk's speakers (like I did) and you would just "bath" in music all day long.
    Report
  • Eduardo López Villa Paredes
    5.0 out of 5 stars Vale la pena
    Reviewed in Mexico on February 15, 2025
    Verified Purchase
    Buena potencia. Buen sonido, Buen precio.
    Report
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Product Summary: Douk Audio ST-01 PRO 200W Bluetooth Amplifier, 2 Channel Vacuum Tube Power Amp with USB DAC/Coaxial Optical Inputs/VU Meter/Treble Bass Control for Home Theater/Stereo Speakers (Upgrade Version)

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About this Item

  • Full Upgraded Version of ST-01: 1. Supports U-disk input to play lossless formats music. 2. Add sensitivity adjustment of VU meter on its bottom, easy to set and match better with different input signals. 3. Add three decorative golden circles around tubes and VU meter, looks more exquisite and luxury.
  • Unique and amazing combination: With VU meter into whole in such a mini size, the pointer dancing in the warm light with strong vintage feelings when enjoy HiFi music, dynamically decorates the audio system space.
  • HiFi clear sound with tone control: resonable circuit and concise wiring, adopts vacuum tubes to soften the sound and filter out the digital feelings, sounds warm and sweet without noise. Also with treble and bass knobs to adjust one's own preferable sound styles, presents HiFi music with rousing highs and deep lows.
  • Strong output power and special AUX output: use TI's classic power amp IC, each channel can output 100W(4Ω) and easily to drive all 3-8Ω passive speakers, adds 3.5mm AUX output easy to connect another amplifier or active speaker / subwoofer to build multiple channel system and enjoy wonderful home theater experience.
  • With multiple digital audio inputs: Bluetooth 5.0 / USB / Coaxial / Optical / stereo RCA, compatible with most audio device such as phones, computers, tablets, TVs, TV, CD players etc. The perfect combination of DAC and amplifier, very suitale for audiophiles who have various audio devices.

Product description

Warm Tips 1. PC-USB input also supports mobile phones that with OTG functions, but Android system needs OTG cable and IOS system needs camera kit, please prepare by yourself. 2. Pluggable tube socket, default 6K4 vacuum tubes, can be replaced by 6J1 / 6J2 / 6*1n / 5654 / 6J4 / 6J5 / 6K5 / 6A2 etc. Parameters Brand: Douk Audio Model: ST-01 PRO Audio input: Bluetooth / USB (PC-USB) / Coaxial / Optical / RCA / U-disk (only ST-01 PRO supported) Audio output: Banana speaker jacks / 3.5mm AUX Max output power: 100W+100W (4Ω) Matched impedance: 3-8Ω Sampling rate supported: USB input: 96KHz/24Bit Bluetooth input: 48KHz/24Bit COAX/OPT inputs: 192KHz/24Bit Supported formats of U-disk: MP3 / WAV / WMA / FLAC / APE Max capacity of U-disk: 64G Treble / Bass adjustment range: 6dB System PC-USB supported: XP/W7/W8/W10/MAC/ Linux Frequency response: 20Hz-20kHz(1dB) S/N ratio: 98dB THD: 0.07% Working voltage: DC 18-30V Dimensions(W*D*H): 115*98*54mm / 4.53*3.86*2.13in Package dimensions(W*D*H): 295*225*85mm / 11.61*8.56*3.35in Net weight: 661g / 1.46lb Package weight: 1.4kg / 3.09lb Packing List 1*ST-01 PRO Amplifier 1*DC 24V Power Adapter 1*Remote Control 1*USB Cable 1*User Manual
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