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The Fosi Audio T20X is an upgraded Bluetooth vacuum tube amplifier designed for listeners who crave the soulful, harmonic richness of analog sound without sacrificing modern convenience. Combining high-efficiency Class D amplification with the natural warmth of vacuum tubes, the T20X serves as the versatile heart of any desktop or bookshelf Hi-Fi system.
Replaceable Vacuum Tubes: Equipped with high-quality 6K4 tubes (compatible with 6J1, 6J4, GE5654, etc.), the T20X filters digital harshness to deliver a smooth, liquid mid-range and sweet treble.
Tone Customization: Independent Bass and Treble controls allow you to fine-tune the sound profile to match your speakers' characteristics or your personal listening preference.
100W RMS Output: Despite its compact size, the T20X pumps out 50W x2 (4 ohms), effortlessly driving most passive bookshelf and floor-standing speakers with clarity and punch.
Bluetooth 5.0 Connectivity: Features a high-gain external antenna for stable, low-latency wireless streaming up to 50ft, supporting effortless pairing with smartphones, tablets, and laptops.
Versatile Listening: Unlike standard power amps, the T20X features a dedicated 3.5mm headphone output. The tube pre-amplification stage applies to the headphone jack as well, providing a warm, "analog" listening experience for your favorite cans.
Subwoofer Output: Includes a dedicated 3.5mm full-frequency/low-pass output, making it easy to build a powerful 2.1 channel system.
| Component | Specification |
| Power Output | 50W x2 @4Ω |
| Terminating Impedance | 2Ω - 8Ω |
| Tubes | 6K4 (Replaceable with 6J1, GE5654, etc.) |
| Inputs | Bluetooth 5.0, RCA Unbalanced |
| Outputs | Speaker Out, 3.5mm Headphone Out, Subwoofer Out |
| SNR / THD | ≥ 99dB / ≤ 0.04% |
| Power Supply | 24V/4.5A |
The Fosi Audio T20X is built for those who appreciate the tactile beauty of audio gear. Its compact aluminum chassis and glowing vacuum tubes make it a visual centerpiece for any workspace. Whether you are rediscovering your vinyl collection via the RCA input or streaming high-res playlists via Bluetooth, the T20X provides a fatigue-free, immersive musical journey.
Stream Hi-Fi music to your stereo system to separate passive speakers and preamps for your audio setup. 100 watt per channel power output can drive most home passive speakers to create unbelievable sound. Easy to fit your audio system with Bluetooth and RCA input.
TPA3221 is a high-power Class-D amplifier that enables efficient operation at full power, idle, and standby. The device features closed-loop feedback with a bandwidth up to 100 kHz, which provides low distortion across the audio band and delivers excellent sound quality.
The 5654W tube has a warm sound and the bass is present. Applicable vacuum tube model: EF95, 6AK5, 6AK5W, 403A/403B, 6J1, 6J1P, 6J2, 6J3, 6J4, 6J5 vacuum tubes,etc. You can replace the vacuum tubes to DIY your stereo system.
Treble and Bass independent gain rotation design, sound quality is under control, adding more playability and fun for music, more ways to play and wait for you to discover.
Bluetooth 5.0 chip ensures your devices maintain a strong, stable connection up to 50 Ft away, and you can enjoy the experiences that have fun, relax and socialize, with no disruption in sound quality.
Strong output power: each channel can output 100W(4Ω) and easily drive 4-8Ω passive speakers to build a multiple channel system and enjoy a wonderful home theater experience..
Type：DAC+Headphone Amp
MAX Power Output：Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers.
Input：USB-C + Optical + Coaxial+3.5mm Microphone
Output：RCA + 3.5mm Headphone
Treble & Bass Control：Yes
THD：<0.003%
SNR：>110dB
Terminating Impedance：16-300 Ohm
Power Adapter：/
Type：DAC+Headphone Amp
MAX Power Output：Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers.
Input：PC-USB + Optical + Coaxial
Output：RCA + 3.5mm Headphone
Treble & Bass Control：Yes
THD：≤0.01%
SNR：>105dB
Terminating Impedance：16-300 Ohm
Power Adapter：/
Type：Bluetooth Tube 2.0 CH Amp
MAX Power Output：100W x 2
Input：Bluetooth + RCA
Output：Passive Speakers + Headphone
Treble & Bass Control：Yes
THD：≤0.3%
SNR：>86dB
Terminating Impedance：2-8 Ohm
Power Adapter：24V/4.5A
Type：Bluetooth DAC 2.1 CH Amp with Remote Control
MAX Power Output：50W x 2
Input：Bluetooth 5.0 + 3.5mm AUX + PC-USB + Optical + Coaxial
Output：Passive Speakers + Active Subwoofer
Treble & Bass Control：Yes
THD：≤0.01%
SNR：>105dB
Terminating Impedance：2-8 Ohm
Power Adapter：24V/4.5A
Fosi Audio T20x 1
Amplifierx 1
Bluetooth Antennax 1
Vaccum Tubesx 2
24V 4.5A Power Adapterx 1
User’s Manualx 1
The Fosi Audio T20X utilizes a hybrid architecture that combines the organic warmth of vacuum tubes with the efficiency of modern amplification. The tubes act as a preamplifier stage, effectively softening the "digital harshness" often found in streaming audio. This results in a much smoother, more musical sound signature with a richer midrange—making it ideal for listeners who find standard solid-state amplifiers too "cold" or "clinical."
Yes, the T20X is a highly versatile 2-in-1 audio solution. It features high-quality speaker terminals on the rear to drive your passive bookshelf or floor-standing speakers, and a dedicated 3.5mm headphone output on the front. When you plug in your headphones, the speaker output is automatically muted, allowing you to enjoy the signature tube warmth in a private listening session.
Absolutely. The T20X is equipped with Bluetooth 5.0 connectivity, allowing you to stream high-quality audio directly from your smartphone, tablet, or laptop. It features an external high-gain antenna to ensure a stable, long-range connection. This makes it perfect for a modern wireless setup while maintaining the vintage aesthetic and sonic character of a classic tube amplifier.
Yes, the Fosi Audio T20X supports tube rolling, which is a favorite hobby for audiophiles. The stock tubes can be easily swapped with a variety of compatible alternatives (such as 5654W, 6K4, or EF95). This allows you to "fine-tune" the amplifier's tonal balance and soundstage to your specific preference, giving you a customizable Hi-Fi experience without needing to buy a new system.
Yes, the T20X includes independent Bass and Treble knobs, alongside the main Volume control. These analog tone controls allow you to adjust the frequency response to compensate for your room's acoustics or the specific sound profile of your speakers. Whether you want to add more "thump" to the low end or extra "sparkle" to the highs, the T20X gives you the flexibility to sculpt your sound on the fly.
