AC 12V 6J1 Valve Pre-amp Tube PreAmplifier Board Headphone Amplifier Buffer With Acrylic Case

Spefications: Channel: 2.0 / stereo Power input:AC 12V 0.8 A / 5.5 * 2.5 plug Switch function: the power switch/volume Size:77 x 75 x 52 mm Instructions: 1. AC 12V input: The DC3.5 / 5.5 * 2.1 socket, 12V AC power adapter, if you use non-plug AC 12V transformer, power cord 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, the MP4, and other music players. 3. The left channel output / right channel output: an audio signal output terminal can be connected to the audio signal input amplifier, power amplifier board. 4. The power switch / volume knob: turn 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 closed 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. Package included: 1 x Pre-Amplifier Board 1 x Acrylic Case Kit