*****Using classical tube 6j1 design and optimize the route, Bluetooth 5.0
Tube preamp((Note: Cannot be used on a record player and phonographs)) *****Tube can be replaced design, soft voice. With treble and bass adjustment *****The power circuit is completely separate from the audio circuit, in order to Minimize interference *****AUX / Bluetooth Audio input, DC12V/1A power supply(Can't beyond 12V)The resistor uses a five-ring 1% metal resistor to ensure a good signal-to-noise ratio *****The product is a preamplifier. It is not audio amplifier. It needs to be connected to an active speaker and a rear amplifier