Specifications:
Type: 6J1 tube (replacement model 6AK5, 6AU6, 5654, etc.)
Channel Types: 2.0/Stereo
Voltage current: AC12V 0.8A or above
Power interface: 5.5 x 2.5 plug.
Circuit board size: 77 x 75 mm/3.03 x 2.95 inches.

Instructions:
1, 12V AC input: with a DC 5.5 x 2.1 connector and a 12V AC transformer, you
You can also use a 12V AC transformer without plug, just need to solder the
Power cable to circuit board.The DC power input can not be used, or
It will not work.
2, Sound Channel Input: connected to mobile phone, computer, MP3, MP4 and many other music players.
3, Sound channel output: connected to the power amplifier audio signal input
4, on/off switch volume knob: turn the knob counterclockwise to lower
volume and continue to rotate until you hear the "tic" sound to turn on
Off.Turn the knob clockwise until you hear the "tic" sound to turn on
turn on and continue to turn up the volume.

Package includes:
1 x PCB board.
1 x 2W 2.2Ω Metal Film Resistor.
6 x 1N4007 large current diodes
6 x 4.7K resistors.
2 x 1K resistors.
4 x 47Ω resistors
2 x 2.2K resistors.
2 x 470K resistors.
2 x 100K resistors.
2 x 200Ω resistors.
Capacitors 9 x 50V 470UF
4 x 50V 1UF Monolithic Ceramic Capacitors
2 x D667 Transistor
2 x B647 Transistor
1 x 50K potentiometer.
2 x 3mm Blue LED
1 x DC005 Power Connector
2 x Tube Base
2 x 6J1 tubes
2 x RCA base.
1 set x separator and screws.
1 x potentiometer cap