1.Make sure the VOL button turn to the minimum.

2.Installing the electronic tube into the bottom of the tube holder according to the direction (the electronic tube does not distinguish between left or right, checking the pin is deformed or not before installing the tube, if have the deformation that can be adjusted by hand).

3.Connecting the need audio sources into the audio source input interface.

4.Connecting the need external equipments into the audio source output interface.

5.Connecting the DC12 power supply.

6.Turn on the power switch.

7.Rotating the knob clockwise to select the required volume.

AIYIMA 
Focus on Audio