ขาย Aiyima A3 เครื่องขยายเสียง 6K4 Tube Amplifier Hifi Preamp Treble Bass Dc12V สําหรับเครื่องขยายเสียงลําโพง ราคาที่ดีที่สุด

Description: Chips: NE5532+6K4 tube 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 effect. If the volume of the rear-end device is adjusted to the maximum and the pre-stage is also adjusted to the maximum, it is easy to be distorted. At this time, you only need to move the pre- or post-level. The volume can be adjusted smaller. 3.Why is the volume of the machine unchanged, and the sound source is different when accessing different audio sources (such as connecting the CD first and then changing to the mobile phone)? A: The amplitude of the output signal of different playback devices is different. For example, the mobile phone is usually 0.35MV, and the CD is 1V. The natural sound size is different. Package included: 1PCS 6K4 Tube preamplifer + 1PCS DC12V 1A Power Adapter