HiFi Bluetooth Tube Amplifier & Headphone Amp for Home Audio

The Fosi Audio T20X Bluetooth Tube Amplifier Headphone is a versatile 2-in-1 HiFi stereo amplifier and headphone amplifier designed for music lovers who want the warmth of vacuum tube sound combined with modern Bluetooth convenience.

Powered by the efficient TPA3221 amplifier chipset and equipped with JAN 5654W vacuum tubes, the T20X delivers warm analog-style audio with strong stereo power output for passive speakers and headphones. Supporting Bluetooth 5.0 wireless streaming and RCA input connectivity, it serves as an excellent desktop amplifier, home stereo receiver, and compact tube audio solution.

Perfect for bookshelf speakers, desktop audio systems, HiFi music listening, and headphone enthusiasts.

Warm Vacuum Tube Audio Experience

The T20X combines modern Class D amplification with classic vacuum tube preamplification to create a rich and musical listening experience.

Included Tubes:

• 2 × JAN 5654W Vacuum Tubes

Tube Audio Benefits:

• Warm analog sound
• Smooth vocal presentation
• Rich harmonic texture
• Relaxed listening experience
• Enhanced musicality

The tube stage helps produce:

• Fuller mids
• Softer treble response
• More organic sound character
• Improved listening comfort

Perfect for:

• Jazz
• Acoustic music
• Vocal performances
• Vinyl-style sound lovers
• Long listening sessions

Tube Rolling & DIY Sound Customization

The T20X supports multiple compatible vacuum tube models for users who enjoy customizing their audio signature.

Compatible Tube Types:

• 6K4
• 6J1
• 6A2
• 6J4
• GE5654
• 6AK5
• 66-series compatible tubes

This allows users to experiment with:

• Different tonal balance
• Warmer sound signatures
• Enhanced detail
• Personalized tube sound

Perfect for audiophiles who enjoy tube rolling and DIY HiFi tuning.

Powerful Stereo Speaker Amplifier

Despite its compact desktop size, the T20X delivers impressive stereo amplification power for passive speakers.

Output Power:

• 100W ×2 @ 4Ω

Supported Speaker Impedance:

• 2Ω–8Ω

The amplifier provides:

• Strong stereo separation
• Dynamic sound reproduction
• Clean detailed playback
• Powerful bass response
• Room-filling sound

Ideal for:

• Bookshelf speakers
• Desktop speaker systems
• Home stereo setups
• Small living room audio systems

Built-In Headphone Amplifier

The T20X also functions as a headphone amplifier for private HiFi listening.

Headphone Features:

• 3.5mm headphone output
• Warm tube-enhanced sound
• Convenient desktop listening
• Integrated amplifier design

Compatible with:

• Wired headphones
• In-ear monitors
• Desktop listening setups
• Casual audiophile listening

Bluetooth 5.0 Wireless Audio Streaming

The T20X features Bluetooth 5.0 connectivity for modern wireless music streaming.

Bluetooth Benefits:

• Faster wireless transmission
• Stable audio connection
• Low signal interruption
• Easy smartphone pairing
• Wireless music convenience

Bluetooth Range:

• Up to 50ft / 15m

Perfect for streaming from:

• Smartphones
• Tablets
• Laptops
• PCs
• Music streaming apps

High-Quality Audio Circuit Design

The T20X uses the efficient TPA3221 amplifier chipset combined with low-noise audio circuitry for clean HiFi playback.

Audio Performance:

• THD: ≤0.05%
• Signal-to-Noise Ratio: ≥105dB
• Frequency Response: 20Hz–20kHz (±1dB)

This results in:

• Clear vocals
• Controlled bass
• Low distortion playback
• Balanced sound presentation
• Smooth listening experience

Compact Desktop-Friendly Design

The T20X combines powerful performance with a compact minimalist design suitable for modern desks and entertainment setups.

Design Features:

• Compact stereo amplifier chassis
• Visible vacuum tube design
• Desktop-friendly footprint
• Lightweight construction
• Easy-access controls

Perfect for:

• Desktop HiFi setups
• Bedroom audio systems
• Home office audio
• Compact entertainment systems

Technical Specifications

• Model: T20X
• Product Type: Bluetooth Tube Amplifier & Headphone Amp
• Amplifier Chipset: TPA3221
• Output Power:
  • 100W ×2 @ 4Ω
• Supported Speaker Impedance:
  • 2Ω–8Ω
• Inputs:
  • Bluetooth
  • RCA
• Outputs:
  • Passive Speakers
  • 3.5mm Headphone Output
• Bluetooth Version:
  • Bluetooth 5.0
• Bluetooth Range:
  • Up to 50ft / 15m
• Frequency Response:
  • 20Hz–20kHz (±1dB)
• THD:
  • ≤0.05%
• SNR:
  • ≥105dB
• Vacuum Tubes:
  • 2 × JAN 5654W
• DC Input Range:
  • 19–30V
• Power Supply:
  • 24V / 4.5A
• Dimensions:
  • 5.40 × 4.80 × 1.35 inches
• Weight:
  • 479.8g

What’s Included

• T20X Tube Amplifier ×1
• Bluetooth Antenna ×1
• JAN 5654W Vacuum Tubes ×2
• 24V/4.5A Power Adapter ×1
• AC Power Cord ×1
• User Manual ×1

Features

• Bluetooth 5.0 tube amplifier
• 100W ×2 stereo power output
• Built-in headphone amplifier
• JAN 5654W vacuum tubes included
• Warm analog-style HiFi sound
• Supports passive speakers
• Tube rolling compatibility
• RCA and Bluetooth inputs
• Compact desktop amplifier design
• Ideal for home HiFi systems