Douk Audio U10 Mini Tube Headphone Amplifier HiFi Stereo Preamp for Home Speaker

Warm Tips 1. Not inlcude power adapter, recommend to use original high-quality power adapter (DC5V/?2A ). U10 won't work normally if the current below 2A. 2. Inputs (3.5mm / RCA) and outputs (6.35mm/3.5mm jack) are connected in parallel, in other words, all inputs and outputs work simultaneously. Don't connect 3.5mm and RCA inputs at the same time, or else audio signals will be mixed. 3. Pluggable tube socket design, 6A2 can be replaced by the following models: 6J1?6?1??6AK5?6BC5?403A/B?5654?EF40?EF95?CV850?6J2?6?2??6AS6?CV2522?EF11/732?CV4011?6J3?6?3??EF96?CV848?6BC6?6AG5? 6J4?6?4?6136?6BX6?6AC7?EF94?6AU6?6K4?6K5?6K4??6BA6?6DA6?EF89/93?5749 4. U10 can easily drive all headphones even with high-impedance such as HD580/HD600/HD650 / K701/K702/Q701 / DT880/T70/T90 / SR225/SR325/RS1e etc. Parameters Brand: Douk Audio Model: U10 Audio input: 3.5mm AUX / Stereo RCA Audio output: 3.5mm / 6.35mm headphone jack Tube Model: 6A2 (2PCS) Op amp model: NE5532 (2PCS) Frequency response: 20Hz-30KHz Output power: ?1100mW (32?) Matched headphone impedance: 18-600? Signal to noise ratio: ?110DB Input voltage: DC 5V (?2A) Working voltage inside: DC 24V Net weight: 200g / 0.44lb Package weight: 300g / 0.66lb Dimensions (W*D*H): 69*95*30mm / 2.72*3.74*1.18in (not including tubes) Package Dimensions (W*D*H): 132*85*90mm / 5.20*3.35*3.54in Packing List 1 × U10 Headphone Amplifier 2 × 6A2 Tube 1 × Acrylic Board 1 × USB to DC Cable 1 × User Manual