AIYIMA A3 Audio 6K4 Tube Amplifier Bile Preamplifier HIFI Preamp

Brand Name : Aiyima Maximum Power Per Channel : NO POWER Origin : Mainland China Package : Yes Channels : 2 (2.0) Certification : CE,FCC,RoHS Model Number : Tube A3 Feature 1 : Tube amplifier Product description: Chips: NE5532+6K4tube Treble adjustment: 6db Bass adjustment: 10db Power supply: DC12V/1A ,more than 12V will burn out the diode. Frequency response range: 20Hz-20kHz (3db) Distortion: 0.3% Input sensitivity:0.2mV SNR:101dB TND:0.1% Control:Potentiometer knob and toggle switch Audio input/ Audio output:Gold-plated RCA Preamp gain:5 times Size: 118.5*98*33MM Operation steps: 1. Make sure the VOL knob is at its minimum. 2. Insert the supplied tube into the tube holder in the direction (the tube does not matter, check whether the lower pin is deformed before installing the tube, and the deformation can be reversed by hand). 3. Connect the audio source you want to use to the audio input connector. 4. Connect the rear-end device that needs an external connection to the audio output connector. 5. Connect the DC12V power supply. 6. Turn the switch on and off to turn it on. 7. Turn the knob clockwise to select the desired volume level and high and low volume. Product questions: 1. All the lines are connected, but there is no sound output? 1. Check if the POWER indicator is on. If it is not lit, turn the switch on. After pressing the power button, the indicator light still does not light up. At this time, you can find an equivalent voltage output (must be 12V) and test again. 2. If the indicator light is on, check if the VOL knob is in the minimum state, such as clockwise rotation in the minimum state. 3. If both of the above are normal, check if the playback device of the input source is paused, muted, or the volume is at its minimum. 2.Why is the sound broken? A: This product is a pre-stage product, and it also has amplifying