Wondiwe 6J1 Valve Tube Preamp Amplifier Audio Board Amplificador Pre-Amp Bile Buffer DIY

1.AC 12V input: Using DC5.5 * 2.1 socket, 12V AC power adapter is available, you can also use 12V AC transformer, if you use 12V AC transformer, power lines need to solder on the circuit board. Remember: You can not use a DC power input, otherwise it does not work! 2. the left-channel input / right channel input: Audio signal input, can be connected to mobile phones, computers, M3, MP4, and other music players. 3. the output of the left channel / right channel output: The audio signal output terminal can be connected to the audio signal input amplifier, power amplifier boards, to provide post-amp Bile flavor of music to enjoy! 4.the power switch / volume knob: The knob counter-clockwise to decrease the volume beginning, when the volume down to the minimum, if it continues to rotate until the "ticking" sound, then the power off, the light goes off. In the off state, turn the knob clockwise to hear "tick" sound, light is on, the power is turned on, then the volume is minimal, then continue clockwise rotation is to increase the volume. Specification: Size: app.7.7x7.5x5.7cm/3.03x2.95x2.24in Color: As pictures shown Quantity: 1 Set Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Set x Valve Tube Preamp Kit or 1 Set x Valve Tube Preamp Housing About expedited delivery orders: Expedited orders will arrive in about 5 business days.