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、6ж1П、6AK5、6BC5、403A/B、5654、EF40、EF95、CV850、6J2、6ж2П、6AS6、CV2522、EF11/732、CV4011、6J3、6ж3П、EF96、CV848、6BC6、6AG5、 6J4、6ж4、6136、6BX6、6AC7、EF94、6AU6、6K4、6K5、6K4П、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 (32Ω)
Matched headphone impedance: 18-600Ω
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