Compact HiFi Bluetooth Tube Amplifier for Speakers & Headphones

The Fosi Audio T20 Bluetooth Tube Amplifier is a compact yet powerful HiFi stereo amplifier designed for audiophiles, desktop audio enthusiasts, and music lovers seeking warm vacuum tube sound with modern Bluetooth convenience.

Featuring Bluetooth 5.0 with aptX and aptX-HD support, dual 6A2 vacuum tubes, and 50W ×2 RMS output power, the T20 delivers rich analog-style sound for passive speakers and headphones. Its compact desktop-friendly design makes it ideal for bookshelf speakers, computer audio systems, home offices, bedrooms, and small HiFi setups.

Whether streaming music wirelessly or connecting wired audio sources, the T20 creates an immersive and musical listening experience with warm tube character and powerful stereo performance.

Warm Vacuum Tube Audio Performance

The T20 combines modern Class D amplification with classic tube preamp technology for smooth and natural sound reproduction.

Included Vacuum Tubes:

• 2 × 6A2 Tubes

Tube Sound Benefits:

• Warm analog tonality
• Smooth vocals
• Rich midrange response
• Relaxed treble presentation
• Musical and immersive sound

The tube stage adds:

• Organic sound character
• Enhanced musicality
• Fuller vocal presentation
• Reduced listening fatigue

Perfect for:

• Jazz
• Acoustic music
• Vocal recordings
• Vinyl-inspired listening
• Long music sessions

Tube Rolling Compatibility for Custom Sound

The T20 supports a wide range of compatible vacuum tubes, allowing users to personalize the sound signature.

Compatible Tube Models:

• JAN 5654W
• 6K4
• 6J1
• GE5654
• 6AK5
• 6ж1П
• 6BC5
• 403A/B
• EF40
• EF95

Tube rolling allows users to experiment with:

• Warmer sound signatures
• Increased detail
• Different tonal balance
• Customized HiFi performance

Perfect for DIY audio enthusiasts and audiophiles.

Powerful Stereo Amplifier for Passive Speakers

Despite its small size, the T20 delivers strong stereo output for home speaker systems.

Output Power:

• 50W RMS ×2 @ 4Ω

Supported Speaker Impedance:

• 2Ω–8Ω

The amplifier is ideal for:

• Bookshelf speakers
• Desktop speakers
• Ceiling speakers
• Outdoor speakers
• Floor-standing speakers

It delivers:

• Dynamic stereo sound
• Strong bass performance
• Clear vocals
• Balanced frequency response
• Room-filling audio

Bluetooth 5.0 with aptX HD Support

The T20 includes Qualcomm QCC3031 Bluetooth technology for high-quality wireless music streaming.

Bluetooth Features:

• Bluetooth 5.0
• aptX support
• aptX-HD support
• Stable wireless connection
• Low-latency audio streaming

Wireless Range:

• Up to 39ft / 12m

Enjoy wireless music streaming from:

• Smartphones
• Tablets
• PCs and laptops
• Streaming devices
• Smart home systems

The Bluetooth implementation is optimized to eliminate unwanted connection pops and interruptions.

Built-In Headphone Amplifier

The T20 also functions as a convenient headphone amplifier for private listening.

Headphone Support:

• 16Ω–64Ω headphones
• Integrated headphone output
• Warm tube-enhanced headphone sound

Perfect for:

• Casual headphone listening
• Desktop audio setups
• Late-night music sessions
• Compact personal HiFi systems

Wide Device Compatibility

The T20 easily integrates with modern home and desktop audio systems.

Input Options:

• Bluetooth
• RCA AUX Input

Compatible Devices:

• Smartphones
• TVs
• CD players
• MP3 players
• Echo Dot
• Streaming media players
• Computers and laptops

The plug-and-play design requires:

• No software installation
• No complicated setup
• No driver installation

High-Quality Audio Circuit Design

Powered by the reliable TPA3116 amplifier chipset, the T20 delivers clean and efficient audio amplification.

Audio Performance:

• THD: ≤0.04%
• SNR: ≥99dB
• Frequency Response: 20Hz–20kHz (±1dB)

Additional protections include:

• Built-in speaker protection circuit
• Stable amplifier operation
• Low distortion playback
• Improved signal clarity

Compact Desktop-Friendly Design

The T20 is designed for modern compact HiFi systems.

Design Features:

• Small desktop footprint
• Minimalist tube amplifier styling
• Easy-access controls
• Lightweight compact body
• Stylish visible tube design

Perfect for:

• Home offices
• Desktop audio systems
• Bedroom setups
• Small apartments
• Minimal HiFi installations

Technical Specifications

• Model: T20
• Product Type: Bluetooth Tube Amplifier
• Amplifier Chipset: TPA3116
• Output Power:
  • 50W RMS ×2
• Speaker Impedance:
  • 2Ω–8Ω
• Inputs:
  • Bluetooth
  • RCA
• Outputs:
  • Passive Speakers
  • Headphone Output
• Bluetooth Version:
  • Bluetooth 5.0
• Supported Bluetooth Codecs:
  • aptX
  • aptX-HD
• Bluetooth Range:
  • Up to 39ft / 12m
• Frequency Response:
  • 20Hz–20kHz (±1dB)
• THD:
  • ≤0.04%
• Signal-to-Noise Ratio:
  • ≥99dB
• Power Supply:
  • 24V / 4.5A
• Operating Voltage:
  • 12–24V

Key Features

• Bluetooth 5.0 tube amplifier
• aptX & aptX-HD wireless audio
• 50W ×2 stereo output
• Vacuum tube preamp sound
• Headphone amplifier included
• Supports passive speakers
• Tube rolling compatibility
• Compact desktop HiFi design
• TPA3116 amplifier chipset
• Warm analog-style sound