6J1 Preamplifier Power 2*30W Amplifiers HiFi Tube Preamp Stereo Bile Buffer audio amplifier board pcb assembly

The electronic tube of this product can be replaced and supports a variety of small 7-pin electronic tubes such as 6J1, 6ж1, 6J2, 6ж2, EF95, 6AK5, GE5725W, GE5654W, etc.

Product Parameters:
Adaptive power supply:DC12V3A               
Audio input:AUX+BT                                    
Input sensitivity:800mV        
Adaptive horn:4-8Ω;5-50W                                
Power output:MAX 30W*2 @4Ω                
Frequency Response:20Hz-20KHz 
Product size:107*80*39mm(height without tube)    
 Packing size:240*155*70mm           
 Packing weight:about 463g

Warning:  
1. Do not open the shell when powered on. Improper operation may cause electric shock. 
2. Do not place the machine in a high temperature and humidity environment. 
3. Do not plug or replace the electronic tube when it is powered on, otherwise your electronic tube and machine will be burned. 
4. Do not replace the mismatched electronic tube model, otherwise your electronic tube and machine may be burned. 5. Insert the electronic tube vertically without shaking.

Operating Instructions:
1,Turn the switch / volume knob counterclockwise to ensure that the switch is off. 
2,Install the electronic tube into the electronic tube base according to the direction (the electronic tube is not divided into left and right. Check whether the pin is deformed before installation. If there is deformation, gently correct it by hand. Slowly insert the electronic tube vertically into the electronic tube base during installation, and pay attention not to shake as much as possible). 
3,The power amplifier output interface is connected to the passive speaker (R to the right channel and L to the left channel) or the aux audio output interface is connected to the active speaker. 
4,Connect the power adapter (power adapter AC110V and AC 220V are common). 
5,Turn the switch / volume knob to start the machine, and the indicator flashes. 
6,This product has AUX wired and BT wireless audio input mode, AUX wired input mode is preferred. Choose the audio input you want. 
7,Turn the switch / volume knob to adjust the volume to the appropriate level. 
8,Enjoy the charm of the amplifier quietly.