Product Overview: Enhance your audio experience with the HiFi Class A Vacuum Tube Pre-Amplifier. This high-end preamp combines classic UK-inspired tube circuits with modern features, delivering rich, warm, and detailed sound. Perfect for home and desktop audio systems, it supports various input options including Bluetooth, USB, FM radio, and SD card, making it a versatile addition to any setup. Key Features: Authentic HiFi Sound: Inspired by classic UK tube preamp circuits, it offers a sweet, warm, and mellow sound with excellent low-frequency performance. Multiple Input Options: Supports 6 types of audio input – Bluetooth 5.0, USB, stereo RCA, FM radio, AUX, and SD card – compatible with most audio devices such as smartphones, tablets, computers, MP3 players, TVs, and CD players. Bluetooth 5.0 Connectivity: Offers wireless music playback and hands-free calls with caller ID broadcast. The Bluetooth module can be turned off independently to avoid interference when using line input. High-Quality Components: Built with high-precision metal film resistors, VISHAY resistors, Ruby filter capacitors, CBB polypropylene capacitors, pure copper gold-plated RCA terminals, and solid aluminum alloy knobs for superior sound quality and durability. Digital Music Player: Supports lossless audio formats such as APE, WMA, WAV, and FLAC via USB and SD card inputs, providing high-quality music playback. FM Radio Function: Built-in FM radio expands your listening options. Elegant Design: Features an exquisite silver lacquered panel, red wood side panels, and a retro vacuum tube, creating a luxurious and elegant look. Specifications: Audio Input: 2 groups of RCA / Bluetooth 5.0 / USB / AUX / FM Radio / SD Card Audio Output: Stereo L/R RCA Working Voltage: AC 110V / AC 220V (switchable) Power Consumption: 20W Sensitivity: 25mV (pure tube preamp mode) Maximum Undistorted Output Level: 13.5V Magnification: 5 times Signal to Noise Ratio: > 90dB Dimensions (WDH): 25414244mm / 105.61.7in Package Dimensions (WDH): 300180200mm / 11.817.097.87in Net Weight: 2.1kg / 4.62lb Package Weight: 2.7kg / 5.95lb Package Includes: 1 x Tube Preamp 1 x Power Cord 1 x Bluetooth Antenna 1 x RCA Cable 1 x AUX Cable 1 x FM Antenna 1 x Remote Control Why Choose Our Vacuum Tube Pre-Amplifier: Our HiFi Class A Vacuum Tube Pre-Amplifier is designed for audiophiles who appreciate the warm and rich sound of vacuum tubes. With multiple input options, high-quality components, and a luxurious design, it offers an exceptional audio experience for all your listening needs.