Douk Audio U10 Mini Vacuum Tube Headphone HiFi Stereo for Home Speakers Amplifier, Preamp,

---------------------------------------------------------------------- 【U10 Headphone Amplifier with High Power】Stereo 3.5mm AUX and RCA inputs make it compatible with most audio sources such as MP3, smartphones, computers, CD players, etc. The headphone jack (3.5/6.35mm) outputs up to 1100mW and can easily drive 18-600Ω headphones. The U10 can also be used as a preamplifier, improving the sound quality of amplifiers and active speakers. 【Advanced Design and HIFI Sound】With innovative built-in voltage boost circuit technology, U10 always operates at 24V high voltage even with DC 5V only input, sound with very quiet background, amazing purity and clarity, Accurate balance and wide sound field, easy to use and unparalleled sound at the same time. [Pluggable design with higher playability] Adopts 2PCS 6A2 tubes to make the sound soft and warm, making it realistic and natural, rich and mellow, delicate and sweet. Both tubes and op amps are designed with pluggable sockets, convenient for tube and op amp upgrades and sound shaping, allowing you to easily enjoy different styles of sounds. All-metal case with excellent shielding, pure ceramic tube socket with anti-oxidation contacts, etc., U10 provides excellent sound and strong power for such mini-sized headphones. Recommended for vocals, string music, light music, classical music, etc. Pluggable tube socket design, 6A2 can be replaced with 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, HD580/HD600/HD650/K701/K702/Q701/DT880/T70/T90/ Easily drives all high impedance headphones such as SR225/SR325/RS1e. 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) Internal working voltage: DC 24V packing list 1 x U10 headphone amplifier 2 x 6A2 vacuum tubes 1 x Acrylic board 1 x USB to DC cable 1 x User manual