Audio Amplifiers
$83.99 $46.99

Product 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
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.
4.Why does the speaker have a large current sound?
A: If you are not using the original standard power supply, please replace the power supply before testing. Many power supplies in the market have a large interference coefficient, which will cause a large current sound.
5.Why do I not play the sound source after I plug in the input cable, and the speaker will have a loud beep?
Answer: When the unshielded signal line is used, the interference signal will enter the amplifier for amplification. If you hate this sound, you are advised to replace the shielded signal line or unplug the signal line.
6.Why did the pre-biliary level buy back and start listening to the sound is very hard, the tri-band is not very clear, but after 1 day, it is normal?
A: The electron tube is a very sensitive device. The temperature should generally reach a certain level to achieve the best effect. Therefore, the sound is very natural after about half an hour of warming up.
7.Can I replace the tube upgrade?
A: Yes, at present, we have tested and matched 6K4/6J4/GE5654/6AK5/6*1n, which can be directly replaced. Different tube sounds will be very different.
8. Can I replace the tube with the power supply?
A: No, it is very easy to burn out the tube because the inside of the machine is working at high voltage. If the hot-swappable tube is burnt out, it may damage the machine.
9.Can this machine be connected to a phonograph/record player?
A: At present, this does not support the signal input of the phonograph/record player. Because the amplitude of the output signal of the phonograph/recorder is very small, it is necessary to increase the phono amplifier.

1. Do not open the case privately. Improper handling may result in electric shock.
2. Please use the switching power supply of the regular manufacturer, otherwise the risk of damage to the machine will be damaged.
3. Do not place the machine in a high temperature and high humidity environment.
4. Do not plug or replace the replacement tube while the power is on, otherwise it will burn your tube and machine.
5. Do not replace the tube type that does not match, otherwise it will burn your tube and machine.

When you use it in the car, pay attention to it, and when it starts to fire, it will reach 13.5V. If you want to use it, the fire is activated after the boot.

Package included:

1PCS 6K4 Tube preamplifer

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Here is an estimate of the shipping times.  Due to factors that often affect international shipments, such as holidays, customs, and weather delays, we can only offer an estimate of shipping times. 


Estimated Shipping Time

United States

10-30 business days

Canada, Europe

15-40 business days

Australia, New Zealand

15-45 business days

Mexico, Central America, South America

20-60 business days 

Middle East (UAE, Saudi Arabia)

20-40 business days


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