Douk Audio HiFi Stereo Bluetooth 5.0 Vacuum Tube Amplifier MM Phono Amp for Turntables User Manual

Douk Audio HiFi Stereo Bluetooth 5.0 Vacuum Tube Amplifier MM Phono Amp

for Turntables

Product Information

Thank you for choosing our product! Please read the following information carefully before using the product.

Functional Specifications

The product has the following functional specifications:

• Bass knob (clockwise bass increased, counterclockwise bass decreased)
• Volume knob (clockwise total volume increased, counterclockwise total volume decreased)
• Treble knob (clockwise treble increased, counterclockwise treble decreased)

The product also has the following technical specifications:

• Max power output: unspecified
• Working voltage: unspecified
• Bass/treble range adjustment
• Input sensitivity: unspecified
• Frequency response: unspecified
• Total harmonic distortion (THD): 0.5%
• Signal to noise ratio (SNR): 90dB
• Bare metal size: L168W118H64mm
• Total weight: 1.66kg
• Package dimension: L300W270H75mm

PRODUCT FAQ

There are currently no frequently asked questions for this product.

Warning

Please read the instructions carefully before using this product. Failure to do so may result in injury or damage to the product.

Product Usage Instructions

To use the product, follow these steps:

1. Connect the product to a power source and turn it on.
2. Adjust the bass, volume, and treble knobs to your desired settings.
3. Connect the product to your audio source using the appropriate cable.
4. Play audio through the product from your audio source.
5. If necessary, adjust the settings of your audio source to further customize your listening experience.
6. When finished, turn off the product and disconnect it from the power source and audio source.

For best results, consult your audio source’s user manual for recommended settings and usage instructions.

Thank you very much for choosing our products!Please read this manual carefully before using the product.

Functional specifications

• On/off machine key (press down to start up, pop up to shut down)
• Bluetooth light
• Bluetooth/Phonograph /RCA input toggle switch
• Tube switch (in the closed state, the audio signal does not go through the tube)
• TONE switch (off, Bass and Treble are invalid)
• Vacuum tube decorative light switch (top: blue/middle: Off/bottom: orange)
• Phonograph ground column
• Phonograph input interface (red: right channel, white: left channel)
• RCA input interface (for example: CD, DAC decoder, mobile phone, TV, etc.);Red: right track,White: connected to left channel)
• Bluetooth antenna base
• Low-pass output interface (connected to active subwoofer)
• Speaker interface (red to positive, black to negative;R to the right speaker, L to the left speaker)
• Power interface (DC voltage shall not exceed 35V)

Top panel description

• Bass knob (clockwise bass increased, counterclockwise bass decreased)
• Volume knob (clockwise total volume increased, counterclockwise total volume decreased)
• Treble knob (clockwise treble increased, counterclockwise treble decreased)

Operation Steps

1. Determine the VOL knob as the minimum state.
2. Load the randomly arranged tube into the tube seat according to the direction (the tube is not divided into left andright sides; check whether the pin is deformed before installing the tube; if it is deformed, correct it by hand).
3. Connect the audio source you need to use to the corresponding audio source input interface (when connecting bluetooth, you need to set the input selection switch to Bluetooth).
4. Connect the speaker (passive speaker or speaker) to the output interface of the speaker (R to the right channel, L to the left channel).
5. Connect to DC power supply (DC voltage shall not exceed 35V).
6. Press the on/off button to turn on the power.
7. Turn the knob clockwise to select the appropriate volume, as well as the high and low volume.

Specifications

FAQ

• Q: I have all the wires connected, but no sound output?
  • A: 1. Check whether the POWER indicator is on or not. If it is not on, press the POWER boot button to start the machine.After pressing the power button, the indicator will still not go on. At this point, you can find a laptop to connect it to the power supply for testing to determine whether it is a machine failure or a power failure.
• 2. If the indicator light is on, check whether the VOL knob is in the minimum state; if it is in the minimum state, it will be normal if it is rotated clockwise
• 3. If the above two points are normal, check whether the input device is paused, mute or at a minimum volume.
• Q: Why does the sound break?
• Answer: the amplifier exceeds the normal output power, there will be a greater distortion of the situation, at this point you put the front volume or amplifier volume down on the normal.
• Q: Why does the loudspeaker produce a loud electric sound?
• A: If you are not using the original standard power supply, please replace the power supply and test again.Many power sources in the market have a large ripple interference coefficient, which will cause a large current sound.
• Q: Why does the speaker make a lot of noise when I plug in the input cord and don’t connect the playback source?
• A: use the signal line without shield, there will be interference signal into the amplifier, if you hate the sound suggest you replace the signal line with shield, or pull out the signal line.
• Q: Why does my amplifier stop working after a period of time, then stop working after a period of time?
• A: Usually in this case, the amplifier is overheated and the output power may have exceeded the design power. At this point, you can lower the volume a little and try again.Q: Why does the volume stay the same, but the volume is different when connected to different sources (such as a CD and then a mobile phone)?
• A: The output range of different types of audio devices is different. Mobile phones are usually 0.35V, while CDS are 1V.The output signal amplitude of the sound source will directly affect the sound size.
• Q: why bravery power put to buy back to begin to listen to a voice very hard, 3 frequency is not very clear, but work day after 1 day normal?
• A: vacuum tube is a very sensitive device, the temperature generally to reach a degree to play the best effect, so the general boot after about half an hour of preheating the sound is very natural.
• Q: Can I replace the valve and upgrade?
• Answer: Yes, at present, we have tested and matched 6J1/6J4/ GE5654/6ak5/6*1n, which can be directly replaced. The sound of different vacuum tubes will be very different.
• Q: Can I replace the vacuum tube by direct unplugging?
• A: No, because the inside of the machine is working at high pressure, the hot plug vacuum tube burnt out may damage the machine.
• Q: Does this machine handle phonographs/record players?
• A: Yes, connect the output line of the phonograph/record player to the corresponding interface of the machine, and then switch the function switch to the “PHONO” file.

Warning

1. Do not open the shell without permission. Improper operation may cause electric shock.
2. Please use the regular manufacturer’s switching power supply, otherwise there will be the risk of damage to the machine.
3. Do not place the machine in a high temperature and humidity environment.
4. Please do not unplug and replace the vacuum tube when it is energized, otherwise it will burn out your vacuum tube and machine.
5. Do not replace the valve model that does not match, or it will burn out your valve and machine.

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