Fosi Audio P3 Vacuum Tube Preamplifier Headphone Amplifier Compact Home Audio Mini Vacuum Tube Preamplifier Bluetooth aptX LL HD Bass Control HiFi

【Important Notice for International Buyers – Tomoayax Premium Audio Hi-Fi Japan】

■ Voltage Compatibility This product is designed exclusively for use in Japan (AC 100V, 50/60Hz).

Many regions use 120V or 220–240V. Using this product without a proper transformer in such voltage environments may result in malfunction, overheating, or serious and irreversible damage.

■ Plug Type This product uses a Japanese plug (Type A or B). A plug adapter may be required depending on your region.

■ Transformer Requirement (Very Important) A transformer is required for safe use.

A plug adapter only changes the plug shape and DOES NOT convert voltage. Using this product without a transformer may cause serious and irreversible damage.

■ Buyer Responsibility As this is high-end audio equipment, the buyer is fully responsible for confirming compatibility with their local voltage (100V / 120V / 220–240V) and usage environment before purchase.

■ No Return / No Refund Policy We do NOT accept returns or refunds for: ・Voltage mismatch (including 120V and 220–240V environments) ・Use without a transformer ・Plug incompatibility ・Damage caused by improper setup or usage

■ Liability We are not responsible for any damage, malfunction, or performance issues caused by improper use or incorrect voltage conditions.

■ Final Notice Please ensure full understanding of the above before purchasing. Use only under the correct voltage environment. Vacuum Tube Amplification: The preamplifier circuit boosts the voltage to 54V, ensuring that the vacuum tubes function to their fullest potential and providing a warm and rich sonic experience. Our unique preamplifier technology delivers a pure audio signal, faithfully reproducing clear highs, rich midrange, and deep, rhythmic bass. Bluetooth 5.1: Equipped with a Qualcomm QCC3031 chip, the P3 preamplifier ensures superior wireless sound quality and low latency, and supports aptX HD and aptX LL codecs. Furthermore, it features a manual reset button to prevent accidental connections by others, improving connection reliability. Multiple Connection Options: The P3 supports Bluetooth/RCA input and RCA/AUX output/3.5mm headphone output. It helps build a 2.1 channel audio system by connecting active speakers or an amplifier and subwoofer. As a headphone amplifier, it supports headphones with impedances from 16Ω to 300Ω. High-Quality Components: This product uses ELNA's audiophile-grade capacitors and tapered A potentiometers. The treble and bass control knobs have center markings to avoid compromising sound quality. With a maximum SNR of 103dB and crosstalk of 95dB, it helps build a hi-fi audio system when paired with the V3 amplifier from the same series. Package contents: Fosi Audio P3 vacuum tube preamplifier x1, user manual x1, 6J1 vacuum tubes x2, 12V/1.5A power adapter x1. [*] Instructions for installing the vacuum tubes can be found in the video on this page. Note: The image shown is of a 5725W vacuum tube, but it has now been changed to a 6J1 vacuum tube. Please note: ① Check that the socket is functioning correctly, that the audio cable and power supply are not loose or have poor contact, and replace any damaged cables in a timely manner. ② Ensure that both vacuum tubes are properly installed. This is not only for the integrity of the electrical connection, but also for the two vacuum tubes to work together to provide the best sound experience. ③ If the device has previously been connected to another Bluetooth device, the device may not be able to automatically connect to the current audio source. Delete the pairing history in the Bluetooth settings and try connecting again. Can I connect to Bluetooth earphones? No, you cannot. The P3 only supports **receiving** Bluetooth signals and does not have the function to **transmit** Bluetooth signals. Bluetooth transmission codecs supported by the P3: SBC/AAC/aptX/aptX HD/aptX LL 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 Response: 20Hz-20kHz (±1dB)