Kuuleyn Vacuum Electron Tube Valve Preamp Amplifier Board Headphone Amp Parts Features: ?Great for?Connect the 6J1 tube pre-amp between sound source and amplifier, it will effectively filter digital flavor, the music and human voice will be relatively good. ?Function?Eight 470UF capacitor filter is very clean, excellent power system to no hum, filaments are powered with DC 12V and need to be connected in series in order to reduce noise. ?Practical?Coupling capacitor is electrodeless electrolytic capacitor with high frequency and low resistance. ?Portable?Using DC 5.5*2.1 socket and AC 12V transformer, you can also use AC 12V transformer without plug, just need to weld the power cord onto the circuit board. ?Application?This kit comes in parts so you can assemble them together by yourself, enjoy the process of building your own tube amplifier. Specifications: Type: 6J1 tube (substitution model 6AK5, 6AU6, 5654 etc.) Channel Types: 2.0 / stereo Voltage Current: AC12V 0.8A or above Power Interface: 5.5 * 2.5 plug Circuit Board Size: 77 x 75mm / 3.03 x 2.95" Package Includes: 1 x PCB Board 1 x 2W 2.2? Metal Film Resistor 6 x 1N4007 Large Current Diodes 6 x 4.7K Resistors 2 x 1K Resistors 4 x 47? Resistors 2 x 2.2K Resistors 2 x 470K Resistors 2 x 100K Resistors 2 x 200? Resistors 9 x 50V 470UF Capacitors 4 x 50V 1UF Monolithic Ceramic Capacitors 2 x D667 Transistors 2 x B647 Transistors 1 x 50K Potentiometer 2 x 3mm Blue LED 1 x DC005 Power Connector 2 x Tube Base 2 x 6J1 Tubes 2 x Base 1 set x Standoff and Screws 1 x Potentiometer Cap ?Funtion?Connect the 6J1 tube pre-amp between sound source and amplifier, it will effectively filter digital flavor, the music and human voice will be relatively good ?Eight 470uf Capacitor Filter?Eight 470UF capacitor filter is very clean, excellent power system to no hum, filaments are powered with DC 12V and need to be connected in series in order to reduce noise ?High Frequency And Low Proof?A coupling capacitor is an electrodeless electrolytic capacitor with high frequency and low proof ?Easy To Use?Using DC 5.5*2.1 socket and AC 12V transformer, you can also use AC 12V transformer without a plug, just need to weld the power cord onto the circuit board ?Can Yourself Assemble Them?This kit comes in parts so you can assemble them together by yourself, enjoy the process of building your own tube amplifier