Features 1. The newest tube preamp of Nobsound with upgraded function and design. Hundreds of reviews and thousands of customers witness the excellent sound performance and quality of our Nobsound NS-08E. This new product will satisfy you again. 2. Excellent sound performance far more than what you paid for; No background noise; Adding tube sound and eliminating digital style for your sound system; Providing warm and soft sound output; Enhancing sound field and sound quality remarkably; Suitable for vocal / string music / soft music / classic music 3. Strong functionality and playability; With independent treble, bass and volume control; Vacuum tube can be replaced by 6ж1П / 6AK5 / 6BC5 / 403A/B / 5654 / EF40 / F95 / CV850 4. The smallest tube preamp in the world; Mini size and exquisite appearance with classic Black & Gold color combination; CNC chamfering process for its aluminum shell and front panel; Beautiful blue tube light; Mellow and solid touch feeling 5. Pure tube preamplifier (only 1.5 ~ 2 times voltage amplification); Its vacuum tube 6J1 adopts classic triode amplifier circuit (high voltage supply); Class A with good sound feeling; Suitable for almost all amplifier circuits 6. Please note this is a preamplifier (not like NS-08E), which needs to be connected with amplifiers or active speakers. It suits for almost all amplifiers in the market especially for our tube headphone amps like our Nobsound NS-08E, NS-01E and NS-02E, and will greatly enhance the sound performance of digital amplifiers like our TPA3116 amps. Using Instructions Phone / Player / MP3 / CD / DAC / Computer Audio source→ 3.5mm / RCA audio cable → NS-10P preamp → 3.5mm / RCA audio cable → Amplifier / Headphone amplifier / Active speakers Parameters Power supply: Input -- AC 100~240V; 50/60Hz (universal) & Output -- DC 6V 2000Ma Voltage amplification: 1.5 ~ 2.0 times Audio input / output: standard 3.5mm Power interface: 6V -- 5.5 * 2.5 SNR: ≥ 110dB Frequency response: 20Hz ~ 30 KHz Dimensions: 105 * 69 * 32 (65mm height with tubes) Net weight: 205g Packing List 1 * NS-10P tube preamp 2 * 6J1 tubes 1 * 6V / 2000mA power supply