Features Display-Worthy Vintage Design: Real walnut housing, glowing tubes, and retro sliders give T12 the warm, nostalgic look of classic audio gear, turning a practical tube preamp into a refined HiFi piece that feels at home beside turntables, speakers, and records. Phono and Line-In Flexibility: Works with MM and MC turntable setups for vinyl playback, while the RCA line input connects CD players, DACs, streamers, or other analog sources, letting T12 serve as both a phono stage and tube preamp for everyday HiFi listening. Bring Out the Tube Warmth: A 120V tube stage helps the 6J5B-Q tubes open up with a smoother, fuller analog tone. Along with low THD and high SNR, T12 gives vocals more body, music a warmer flow, and playback a cleaner foundation. Tune Sound by Sight and Touch: Bass and treble adjust up to ±10dB, with center-detent sliders for an easy return to neutral. The visible slider positions are easy to read at a glance, helping you fine-tune sound for different records, speakers, rooms, or personal taste. Output Switching Made Easy: Dual RCA outputs let you switch between two amplifier or powered speaker systems for quick comparison or daily listening, without the hassle of repeated unplugging. The 3.5mm headphone output makes late-night personal listening easier. Q: Why is the walnut finish on my T12 slightly different from the pictures? A: T12 uses real walnut wood, so each unit has its own natural grain pattern. Slight differences in color or texture are normal and make each piece unique. Q: Why is there no sound immediately after powering on the T12? A: This is normal. The tubes need about 5–10 seconds to warm up after power-on. Sound may be absent or gradually increase during this time. Q: Why is there no sound from the RCA outputs when I plug in headphones? A: This is normal. The headphone output takes priority, so the RCA outputs will not work when headphones are connected. If you want RCA output, please unplug the headphone. Q: Can RCA Output 1 and Output 2 work at the same time? A: No. Only one RCA output can be active at a time. Please select either Output 1 or Output 2. Q: Can the vacuum tubes be replaced? A: Yes. The tubes are replaceable, but only with the same tube model. Tube modules supplied by us support plug-in replacement; separately purchased tubes may require soldering. Q: Why do I hear noise when using low-impedance headphones (below 32Ω)? A: This is normal. Low-impedance headphones are more sensitive and may amplify background noise. We recommend using headphones rated at 32Ω or higher. You can also use an impedance adapter (30-80Ω) or lower the volume to reduce the noise. Parameters Brand: Douk Audio Model: T12 Audio Input: RCA Line In / PHONO (MM / MC) Audio Output: 2 × RCA Out / 3.5 mm Headphone Output Vacuum Tube: 6J5B-Q Anode Voltage: 120 VDC Frequency Response: PHONO: RIAA Equalization RCA: 20 Hz–20 kHz; SNR: ≥78 dB (RCA In) THD: <0.002% (RCA In) Maximum Input Level: 1.5 Vrms Maximum Output Level: 8 Vrms @ 600 Ω Input Impedance: MM: 47 kΩ; MC: 150 Ω; RCA Line In: 50 kΩ Output Impedance: 10 Ω Gain: MM: 45 dB; MC: 58 dB; RCA Line In: 10 dB Tone Control Range: ±10 dB Matched Headphone Impedance: 32–200 Ω Headphone Output Power: Max. 350 mW Power-Off Memory: Supported Power Input: DC 12 V ≥1 A (5.5 × 2.1 mm) Dimensions (W × D × H): 147 × 91 × 78 mm / 5.82 × 3.54 × 3.07 in Package Dimensions (W × D × H): 200 × 185 × 98 mm / 7.87 × 7.28 × 3.85 in Net Weight: 544 g / 1.20 lb Package Weight: 833 g / 1.84 lb Packing List 1* T12 1* DC 12V Power Supply 1* Ground Wire 1* User Manual

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