Fosi Audio P3 Vacuum Tube Preamp Headphone Amplifier Small Home Audio Mini Vacuum Tube Preamp Bluetooth aptX LL HD High Bass Control Compatible HiFi

------------------------------------------------------------------------------------------------------------------ 【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction. 【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary. 【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device’s requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product. 【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer. ------------------------------------------------------------------------------------------------------------------ Vacuum Tube Amplification: The preamplifier circuit sublimes the voltage to 54V, ensuring the vacuum tubes work to their full potential, providing a warm and rich sonic experience. Proprietary preamplifier technology provides a pure audio signal, with crisp highs, rich midrange, and deep rhythmic bass. Bluetooth 5.1: Equipped with Qualcomm QCC3031 chip, the P3 preamplifier ensures superior wireless sound quality and low latency, and is compatible with aptX HD and aptX LL codecs. Additionally, it comes with a manual reset button to prevent accidental connections by others, improving connection reliability. Multiple connection methods: P3 supports Bluetooth/RCA input and RCA/AUX output/3.5mm headphone output. Helps build a 2.1 channel audio system by connecting active speakers or amplifiers and subwoofers. As a headphone amplifier, it supports headphones with an impedance of 16Ω to 300Ω. HIGH QUALITY COMPONENTS: This product uses ELNA's audiophile grade capacitors and tapered A pots. The high/bass control knob has a central engraving to avoid compromising sound quality. The SNR can reach up to 103dB and the crosstalk can reach 95dB, and when combined with the same series V3 amplifier, it can help you build a high-fidelity audio system. What's in the box: Fosi Audio P3 tube preamp x1, user manual x1, 5654W tube x2, 12V/1.5A power adapter x1, 24 months worry-free warranty and prompt customer service. [※] You can see how to install the vacuum tube in the video on this page. 【※】 Note: ① Please check whether the socket is working properly, the audio cable and power supply are not loose or have poor contact, and replace the damaged cable in a timely manner. ② Make sure both vacuum tubes are installed correctly. More than just the integrity of the electrical connections, the two vacuum tubes work together to provide the best sound experience. ③ If your device was previously connected to another Bluetooth device, your device may not be able to automatically connect to the current audio source. Please delete the pairing history record in Bluetooth settings and reconnect. RMS power: 250mw @16Ω; 150mw @32Ω; 32mw @250Ω; 20mW @300Ω Headphone impedance: 16-300Ω; SNR: ≥103dB; THD: ≤ 0.02% Input: Bluetooth 5.1/RCA; Output: RCA/AUX/3.5mm Headphone jack dynamic range: 104dB; Frequency characteristics: 20Hz-20kHz(±1dB)