Warm tips.
1: This product is an electronic tube preamp board, without amplifier function.
2: can not be connected to passive audio and speakers, can not be connected to headphones.
3: Can not be connected to the car use.
4: The power supply is: DC12V DC.
5: must be connected to active audio or rear amplifier use.

Multifunctional TUBE-PREAMP preamp

Wireless Bluetooth connection, U disk lossless playback, high and bass adjustment, infrared remote control, bile tube can be replaced

Functional description.

1: Support for computer USB sound card 16-bit 78KHZ sound quality.
2: U disk only support FAT32 format, support: FLAC ,APE,WAV,WAM,MP3 and other formats, support 16-bit 44100HZ CD sound quality. (Infrared receiver head on the body, there are mode keys and pause button, the previous song key. The next song key)
3: Support Bluetooth 5.0
4: Support for external input
5: support for high and bass adjustment, potentiometer volume control, high and low potentiometer to the middle of the position for full-range output, high and low potentiometer to the left or you adjust for high and low boost.
6: Power supply DC12V-16V, current 1A or more
7: not directly connected to speakers or headphones, before the stage only voltage amplification without current amplification.

Product Size

Users just starting out should be aware of the following frequently asked questions.

Electronic tube preamp is a class A amplification state (that is, the preamp is always amplified state), the signal line is recommended to use the wire with shielding, or there may be products with interference sound …..