<b>Features:</b><br> 1. Tube bile preamplifier, the audio signal input terminal can be connected to the computer, mobile phone, CD, lossless music player and other audio sources.<br> 2. The output terminal can be connected to various digital amplifiers, active multimedia speakers and other audio equipment.<br> 3. With the function of high and low bass adjustment, according to the different parameters of the respective audio equipment, free adjustment to achieve the ideal HiFi sound quality effect.<br> 4.6N3 tube is discontinued. The matched 6N3 tube is brand new or disassembled. All tubes have been tested and shipped randomly.<br> 5. Bluetooth uses QCC3003 Bluetooth 5.0<br> 6. Audio input terminal:<br> 1).RCA audio input (mobile phone/MP3/computer/CD player, etc. can be used as input)<br> 2).Wireless Bluetooth input<br> 7. Audio output terminal:<br> RCA output (can not be directly connected to passive speakers, you need to connect an amplifier and then connect to passive speakers or directly connect to active speakers)<br> 8. Power DC input: 12V 1.5A power adapter<br> 9. Operation mode:<br> 1). Power switch<br> 2). RCA and Bluetooth switch<br> 3). High and bass adjustment, total tone adjustment<br> 10. Approximate size: 98*33*123mm (excluding protruding parts)<br> <b>Note:</b><br> 1. This product is a pre-amplifier, not a power amplifier. It needs to be connected to a post-amplifier or active speakers. It cannot be directly connected to passive speakers, speakers and headphones.<br> 2. The product can not be used in the car, the car voltage is unstable and will burn.<br> <b>Package included:</b><br> 1Pc 6N3 Tube Amplifier Preamp<br> 1Pc DC12V 1.5A Power Adapter<br>