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100W Fosi Audio T20X Bluetooth Vacuum Tube Amplifier

75,757 208,811 November 17, 2025 at 09:30 PM Get AliExpress coupons
Deal
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+36
8,319 Views
$49
$119.00

Deal Details

Promoted 11-23-2025 by Nate650 | Staff at 11:57 AM View Original Post
Fosi Audio Flagship Store via AliExpress has 100W Fosi Audio T20X Bluetooth Vacuum Tube Amplifier Stereo Power Amp (TPA3221) on sale for $61.13 - $12 when you apply promo code AEUS12 at checkout = $49.13. Shipping is free.

Thanks to Sr. Deal Editor iconian for sharing this deal.

Note: Price may fluctuate slightly with currency exchange rates. You must be signed into your AliExpress account and have your address added to add items to your cart and place an order. You may have to manually type in the promo code to apply it at checkout. This item ships from a USA warehouse. For expedited customer service, please email [email protected].

Product Details:
  • Wireless Bluetooth 5.0 core, Streaming range up to 28ft(10m), no pop when Bluetooth connecting
  • 100W RMS X 2 power output(4 ohms, 20 Hz - 20 kHz, 0.3% THD), built-in speakers protection circuit, best for outdoor/ bookshelf/ computer/ desktop /ceiling /floor standing speakers, can use iPod, Phone, MP3 players, TV, Echo Dot, CD players, or Streaming Media players as input
  • Adopt 2 x GE5654W tubes to get clear audio sound, tubes can be replaced by 6J4, 6J1, 6K4, 6AK5, 6ж1П, 6BC5, 403A/B, EF40, EF95 and so on, with headphone output for 16-64ohm headphones
  • Small simple compact design but practical and powerful, Hi-Fi Bluetooth amplifier receiver exclusively designed for the customers who pursue HiFi sound
  • Power amp + headphone amp, perfectly suited for your desktop or a smaller space in your home or office, digital amplifier is easy to connect to your audio system with no software to install or settings to change
  • 24-month warranty and friendly customer service

Editor's Notes & Price Research

Written by Nate650 | Staff

  • Please see the original post for additional details & give the wiki and additional forum comments a read for helpful discussion.

Original Post

Edited November 23, 2025 at 10:39 AM by iconian | Staff
ships from the USA warehouse

deal [aliexpress.us]

$48.66 + Free S/H w/ coupon code AEUS12
About the OP
iconian | Staff Pro Sr. Deal Editor
Joined Feb 2006 Slickdeals Staff R U an ultracrepidarian?
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Joined Nov 2019
L3: Novice
> bubble2 261 Posts
38 Reputation
Stinktooth
11-18-2025 at 07:24 AM.
11-18-2025 at 07:24 AM.
Looks like a nice little mini amp for your PC.
1
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Joined Sep 2017
L4: Apprentice
> bubble2 374 Posts
22 Reputation
lmedrano78
11-18-2025 at 09:36 AM.
11-18-2025 at 09:36 AM.
These are always fun, if you like music. You can play with different tubes to get different sound signatures...
1
2
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Joined Mar 2007
L-9: Betrayal
> bubble2 510 Posts
79 Reputation
tfox
11-18-2025 at 10:42 AM.
11-18-2025 at 10:42 AM.
Neat little unit. Class D amp with a TPA3221 chip quoting 100 watts per channel. Would be a simple way to power a pair of bookshelf speakers.
1
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Joined Aug 2011
L9: Master
> bubble2 4,130 Posts
628 Reputation
fritzo
11-18-2025 at 01:10 PM.
11-18-2025 at 01:10 PM.
I use this as an amp for my turntable, Works great!
1
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Joined Dec 2003
L6: Expert
> bubble2 1,728 Posts
195 Reputation
lifeatragedy
11-21-2025 at 08:27 AM.
11-21-2025 at 08:27 AM.
have a similar douk audio st-01-pro https://www.amazon.com/Douk-Audio...B0BBRBWW36 that looks chonkier.... I like, but feels kinda warm/not sure if normal or not. Other than that, I like it. This looks similar minus the visual meter. I power a pair of sony bookshelf speakers that I have mounted on my wall behind my odyssey G9 ultrawide 49 monitor that is also mounted on the wall.
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Joined Oct 2008
L5: Journeyman
> bubble2 607 Posts
149 Reputation
frd1963
11-22-2025 at 03:34 PM.
11-22-2025 at 03:34 PM.
Quote from lifeatragedy :
have a similar douk audio st-01-pro https://www.amazon.com/Douk-Audio...B0BBRBWW36 that looks chonkier.... I like, but feels kinda warm/not sure if normal or not. Other than that, I like it. This looks similar minus the visual meter. I power a pair of sony bookshelf speakers that I have mounted on my wall behind my odyssey G9 ultrawide 49 monitor that is also mounted on the wall.

The tubes need to get warm to work. If it's not warm, it's probably broken
1
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Joined Jun 2006
L2: Beginner
> bubble2 70 Posts
10 Reputation
nujer99
11-22-2025 at 07:38 PM.
11-22-2025 at 07:38 PM.
Seeing a price of $55.36 now
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Joined Jun 2013
L5: Journeyman
> bubble2 920 Posts
291 Reputation
abstractedpudding
11-23-2025 at 12:03 PM.
11-23-2025 at 12:03 PM.
Quote from frd1963 :
The tubes need to get warm to work. If it's not warm, it's probably broken
Pretty sure that's trolling because I can't imagine anybody buying a tube amplifier and not knowing this.
Reply
Joined Jul 2017
Two Buck Chuck
> bubble2 2,877 Posts
308 Reputation
fintlewoodlewix
11-23-2025 at 12:46 PM.
11-23-2025 at 12:46 PM.
By most reports, these are garbage. Uneven frequency response. Lots of distortion. The good news is, the amp stage is solid state. The bad news is, the preamp stage is tubesa, and it's poorly done. But hey, if you don't know what good sound sounds like, this'll probably make you think you're an audiophile for cheap. Lulz.
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Joined Apr 2004
L4: Apprentice
> bubble2 366 Posts
137 Reputation
Ghengis
11-23-2025 at 03:44 PM.
11-23-2025 at 03:44 PM.
Quote from fintlewoodlewix :
By most reports, these are garbage. Uneven frequency response. Lots of distortion. The good news is, the amp stage is solid state. The bad news is, the preamp stage is tubesa, and it's poorly done. But hey, if you don't know what good sound sounds like, this'll probably make you think you're an audiophile for cheap. Lulz.
To be honest, I'm not an audiophile like some hardcore people but as long as it sounds good 'enough' it's good enough. LOL I use this for my my old Klipsch ProMedia 2.1 I had but the amp died and this works great and looks cool. lol ..
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Joined Apr 2004
L4: Apprentice
> bubble2 366 Posts
137 Reputation
Ghengis
11-23-2025 at 06:05 PM.
11-23-2025 at 06:05 PM.
Quote from fintlewoodlewix :
The good news is, if you're listening on Klipsch ProMedia, then the amp you use doesn't matter. You can feed it with a hamster wheel, some wire, and an iron nail. It'll all sound the same.
Relax, maestro. We're not tuning a million-dollar listening room, just figuring out how to get decent sound out of $100 speakers that's broken here. LOL
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