DOUK AUDIO M-504C P6 HiFi Bluetooth Valve Tube Preamp Stereo Audio Amplifier Instruction Manual

DOUK AUDIO M-504C P6 HiFi Bluetooth Valve Tube Preamp Stereo Audio

Amplifier

Product Information

The product features a front and rear panel with various interfaces and controls.

Product Using Instructions

Operation Steps

1. Install the matching electronic tube into the electronic tube base according to the correct direction. Ensure that the pin is not deformed.
2. Connect the audio source device to the audio source input interface.
3. Connect the rear level equipment to the RCA output interface of the machine.
4. Connect the power supply. The DC voltage should not exceed 12V.
5. Start the machine and switch to the desired input channel.
6. Adjust the Bass, Treble, and Master volume knobs to achieve the desired volume and sound effects.

• Specifications
  • Frequency Response: THD
  • SNR: ≥104dB
  • Working Voltage: DC12V
  • Maximum Output Power of Headphones: 140mW
  • Headphone Impedance Matching: 16-300
  • Bluetooth Version:
  • Input Sensitivity: RCA Maximum Output Level
  • Bass and Treble Adjustment Range:
  • Package Weight: 0.92kg
  • Package Size: L300W230H65mm

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

Front and rear panel description

1. VU level meter
2. Master volume control knob
3. Treble adjustment knob
4. Bass adjustment knob
5. On/off / input channel switching
6. Input channel indicator
7. 3. 5 Headphone interface (synchronous output with RCA)
8. RCA input (mobile phone, computer, decoder, etc. can be connected)
9. Bluetooth antenna base
10. RCA output (red/right channel, white/left channel)
11. Power interface (DC voltage shall not be higher than 12V)
12. Sensitivity regulator of VU meter

Operation steps

1. Install the matching electronic tube into the electronic tube base according to the direction (the electronic tube is not divided into left and right, and pay attention to check whether the pin is deformed).
2. Connect the audio source device to be used to the audio source input interface.
3. Connect the rear level equipment to be used to the RCA output interface of the machine.
4. Connect the power supply (DC voltage shall not be higher than 12V).
5. Start and switch to the corresponding input channel.
6. Adjust the Bass, Treble, and Master volume knobs for proper volume and sound effects.

Specification Parameters

FAQ

• Q: All my wires are connected. Why is there no sound?

1.  **A:** Check whether the machine is powered on and switch to the corresponding input channel.
2. Check whether the back-end connection is correct and whether the volume is in the minimum state.
3. If all the above are normal, please check whether the input playback device is muted, paused, or the volume is at the minimum value.

• Q: Why is the sound distorted?

1.  **A:** The input level may be too large. If the volume of the input device is turned on very large and the volume of the machine is also turned on very large, it is easy to be distorted. Just turn down the volume of the sound source input device or the machine.

• Q: Why is there a lot of electrical noise from the loudspeaker?

1.  **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 disturbance coefficient, which will cause a large current sound.

• Q: Why does the speaker make a loud buzzing sound when I plug in the input cord and don’t connect the audio source?

1.  **A:** When the signal line without shielding is used, there will be interference signals entering the power amplifier for amplification. It is recommended that you replace the signal line with shielding or unplug the signal line.

• Q: Can I replace the tube without turning off the power?
  • A: No, because the inside of the machine is working at high pressure, the hot plug vacuum tube burnt out may damage the machine.

Warning

1. Please do not open the machine shell. Improper operation may cause electric shock.
2. Please use the regular manufacturer of switching power supply, otherwise there will be the risk of damage to the machine.
3. Please do not change the vacuum tube at will, or it will burn out your vacuum tube and machine.
4. Do not put the machine in a high temperature or humid environment.

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