A3 Pro Manual

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A3 Pro Manual Download

Front Surface Instructions

A3 Pro

  • ①…………………………Power Switch
  • ②…………………………Power Indicator Light
  • ③…………………………Bass Knob (increase clockwise and decrease counterclockwise)
  • ④…………………………Treble Knob (increase clockwise and decrease counterclockwise)
  • ⑥…………………………VOL+/-(increase clockwise and decrease counterclockwise)

 

Basic version after the panel

A3 Pro

  • ①……………………………Audio InSuch asCDDACMobIleTV etc,(Such as CD, DAC decoder, mobile phone, TV, etc., red to right channel input, white to left channel input)
  • ②……………………………Audio Out (Such as amplifier, Earphone amplifier, active speaker,red to right channel input, white to left channel input)
  • ③……………………………Power Plug ( DC power cann’t beyond 12V)

 

Bluetooth version of the back panel

A3 Pro

  • ①……………………………Bluetooth antenna
  • ②……………………………Bluetooth /AUX input toggle switch (switch to AUX bluetooth disconnect)
  • ③……………………………Audio InSuch asCDDACMobIleTV etc,(Such as CD, DAC decoder, mobile phone, TV, etc., red to right channel input, white to left channel input)
  • ④……………………………Audio Out (Such as amplifier, Earphone amplifier, active speaker,red to right channel input, white to left channel input)
  • ⑤……………………………Power Plug ( DC power cann’t beyond 12V)

 

Operation Steps:

  • Make sure the VOL turnto the minimum
  • Install the tube into the base of the tube according to the direction (the tube is not left or right, check whether the pin is deformed before installing the tube, and the deformation can be corrected by hand).
  • Connect the sound source that needs to be used.
  • Connect the external post equipment to the audio source output interface.
  • Connect the DC12 power supply
  • Turn on the power switch
  • Rotate the knob clockwise to select the desired volume

 

Specifications

Preamp Gain
5 times
THD
0.1%
Bass & Treble Range
±6dB
SNR
98dB
Working voltage
DC12V
Product Dimension
L118.5*W98*H33MM
Input Sensitivity
0.2mV
Product Weight
0.3kG
Frequency Range
20Hz-20kHz(±3dB)
Package Dimension
L235*W210*H65MM

 

Frequently Asked Questions:

Q:ables are connected, but no sound output?

A: 1. Check the POWER indicator is on, press the POWER button if the light is still off, At this point you can find a same output voltage power supply (must 12V) to check if the machine or power supply failure.If the POWER indicator light is on, check whether the corresponding input signal is selected correctly.

  1. If the indicator light is on, check whether the VOL knob is in the minimum position. If so, turn clockwise to normal Volume
  2. If both of the above are normal, check the input device if it is paused, mute, or the volume is minimized

Q: Why does the sound is cracking?

A: This product is for the tube preamp, but also can be used as preamp, If post equipment is max volume & preamp too, it's easy to distortion, you just need to turn down the volume of the equipment, then ok.

Q: why does the volume of the machine stay the same, while the sound of different audio sources (such as CDS and mobile phones) is different?

A: The output range of different types of audio source devices is different, the mobile phone is usually 0.35mV, and the CD is 1V.The signal output amplitude of the sound source will directly influence the volume

Q: Why do loudspeakers make a lot of electric noise?

A: if you are not using the original factory standard power supply, please replace the power supply before testing.Many power supply in the market have large interference coefficient, which will cause a lot of current sound.

Q: Why the speaker has drone when I just plug in the input cablebut don’t connect the sound sources ?

A: If you use unshielded signal lines, there will be interference signals entering the power amplifier. If you hate the sound, you are advised to use the shielded signal lines or unplug the signal lines.

Q: Why the sound is very hard at the beginning, the 3 frequencies is not very clear, but normalafter a day use?

A: The tube is a very sensitive device with good effect once the temperature should reach a degree commonly, normally about half an hour later the voice is very natural.

Q: Can I update the tube?

A: yes, we have tested and matched 6k4/6J1/6j4 / GE5654/6ak5/66*1n1n in our factory. It can be replaced directly. The sound will be different with different tube.

Q: Can I replace the tube without power off ?

A: no, it is very easy to burn the tube, because the machine works under high voltage and the hot plug will damage the tube & machine, also will hurt the people

Q: Can this machine connect to the phonograph/phonograph?

A: At present, this model does not support the signal,input of the phonograph/gramophone because the output signal amplitude of the phonograph/gramophone is small, so it needs to increase the phonograph amplifier.

 

Warning

  1. Please do not open the shell without permission. Improper operation may cause the danger of electric shock.
  2. Please use the power supply of the regular manufacturer, otherwise it will damage the machine.
  3. Please do not use the machine in a high temperature and humidity environment.
  4. Please don’t replace the tube when the power on, otherwise the tube & machine will be demaged
  5. Please don’t use the non-matched tube, otherwise the tube & machine will be demaged

 

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