- T4 PRO tube preamp meets more HiFi needs: MM phono input, converts phono signal to line level signal, with low-nois integrated circuits and high-quality components to ensure clear and clean sound.3.5mm AUX input, amplify the low level audio signal from your phone, tablet, PC,MP3 etc., easier to drive amplifier or active speaker and greatly improve the sound quality.
- Imported JAN5654 tubes and vintage warm sound: default comes with JAN5654 tubes, improves everything associated with your music such as detail, transparency, immediacy, richness, dynamic, tone etc., much better than 6J1 series especially in human voice. Pluggable tube socket for tube rolling and sound-shaping, easy to pick from and alter the sound signature to one's preference.
- 3.5mm headphone output and perfect circuit design: T4PRO also with built-in classic headphone amp circuit(2*NE5532), easily to drive 32-300 ohm headphones. Reasonable and advanced architecture, TI TPS5430 for power management, TL071+JRC2068 phono preamp circuit etc., enjoy HiFi analog sound and first-class design with an unbeatable low cost.
- Mini size and excellent performance: all designs full of details, solid aluminum knob, potentiometer for smooth multi-level gain adjustment, grey integrated moulding aluminum alloy shell decorates with special red tube cover and knob, looks vintage and elegant. Compact T4 PRO will give you a different acoustic enjoyment with large dynamic and sweet tube sound even in limited space.
- Brand: Douk Audio
- Model: T4 PRO
- Audio input: MM phono / turntable / 3.5mm AUX
- Audio output: stereo L/R RCA / 3.5mm headphone jack
- Output level: 1.5V (input 0.775V)
- Max output power of headphone jack: 150mW@32Ω
- Matched headphone impedance: 32-300Ω
- Input sensitivity: 0.775V
- Frequency response: 20Hz-20KHz(±3dB) (AUX IN) / Standard RIAA (phono IN)
- S/N ratio: ≥105dB
- THD: 0.2%
- Dimensions(W*D*H): 95*117*30mm / 3.74*4.61*1.18in (exclude tubes)
- Package dimensions(W*D*H): 255*215*65mm / 10.04*8.46*2.56in
- Net weight: 330g / 0.73lb
- Package weight: 600g / 1.32lb
- T4 PRO Preamp ×1
- JAN5654 Vacuum Tube ×2
- DC 12V Power Adapter ×1
- 3.5mm to RCA Cable ×1
User Manual of Douk Audio T4 PRO
Warm tips:
- 3.5mm AUX input with priority, please make sure the AUX cable has been pulled out if want to use MM phono input.
- Stereo RCA and 3.5mm headphone jack can output at the same time, and the knob also controls the volume of two outputs simultaneously.

Hi-Fi Sound for Record Players
- Douk Audio T4 PRO delivers pristine audio clarity with its MM phono input, converting phono signals to line level with the aid of low-noise circuits and premium components.

Versatile Input Options
- It boasts a 3.5mm AUX input, making it easy to amplify audio from various devices, enhancing sound quality across the board.

Authentic Vintage Tone
- Equipped with imported JAN5654 tubes, T4 PRO offers a rich, warm sound that elevates music details, dynamics, and tonality, especially in vocal performances.

Customizable Sound Experience
- The pluggable tube socket allows for easy tube rolling, enabling users to tailor the sound signature to their preference.

Powerful Headphone Compatibility
- With a built-in classic headphone amp circuit, T4 PRO effortlessly drives headphones ranging from 32 to 300 ohms, providing a personal audio experience that's nothing short of exceptional.

Advanced Circuitry
- T4 PRO features a sophisticated circuit design with components like the TI TPA5430 for power management and a combination of TL071 and JRC2068 for the phono preamp, ensuring top-tier sound quality.

Compact Yet Powerful
- Despite its small size, T4 PRO packs a punch with a robust aluminum construction, providing a vintage aesthetic and outstanding acoustic performance even in confined spaces.

Elegant Design with Modern Touches
- T4 PRO's design is a fusion of classic elegance and modern functionality, with a solid aluminum knob and a special red tube cover, making it a stylish addition to any audio setup.