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Connect the 6J1 tube preamp between the sound source and amplifier, it effectively filters the digital taste, the music and human voice are relatively good Coupling capacitor is an electrodeless electrolytic capacitor with high frequency and low resistance With a DC 5.5 x 2.1 socket and an AC 12 V transformer, you can also use an AC 12 V transformer without a plug, you only need to weld the power cable to the board Eight 470UF capacitor filters are very clean, excellent power supply system without hum, filaments are powered by DC 12V and must be connected in series to reduce noise This kit comes in individual parts so you can assemble it yourself, enjoy the process of building your own tube amplifier; Product description Description: A tube amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Connect this 6J1 tube preamp between the sound source and it can effectively filter the digital taste. Tube amplifier produces a warmer or more natural tube sound, makes music and the human voice is relatively good. Features: Connect the 6J1 tube preamp between sound source and amplifier to effectively filter the digital taste, the music and human voice will be relatively good. Eight 470 UF capacitor filters are very clean, excellent power supply without humming, filaments are powered by DC 12V and must be connected in series to reduce noise. The coupling capacitor is an electrode-less electrolytic capacitor with high frequency and low resistance. With a DC 5.5 x 2.1 socket and an AC 12 V transformer, you can also use an AC 12 V transformer without a plug. You just need to weld the power cord to the board. This kit comes in individual parts so you can assemble them yourself and enjoy the building process of your own tube amplifier. Specifications: Type: 6J1 tube (replacement model 6AK5, 6AU6, 5654, etc.) Channel types: 2.0 / stereo. Voltage current: AC 12 V 0.8 A or more. Power interface: 5.5 x 2.5 plug. PCB size: 77 x 75 mm / 3.03 x 2.95 inches. Instructions: 1, AC 12 V input: with a DC 5.5 x 2.1 socket and an AC 12 V transformer, you can also use an AC 12 V transformer without a plug.; Product description Description: A tube amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Connect this 6J1 tube preamp between the sound source and it can effectively filter the digital taste. Tube amplifier produces a warmer or more natural tube sound, makes music and the human voice is relatively good. Features: Connect the 6J1 tube preamp between sound source and amplifier to effectively filter the digital taste, the music and human voice will be relatively good. Eight 470 UF capacitor filters are very clean, excellent power supply without humming, filaments are powered by DC 12V and must be connected in series to reduce noise. The coupling capacitor is an electrode-less electrolytic capacitor with high frequency and low resistance. With a DC 5.5 x 2.1 socket and an AC 12 V transformer, you can also use an AC 12 V transformer without a plug. You just need to weld the power cord to the board. This kit comes in individual parts so you can assemble them yourself and enjoy the building process of your own tube amplifier. Specifications: Type: 6J1 tube (replacement model 6AK5, 6AU6, 5654, etc.) Channel types: 2.0 / stereo. Voltage current: AC 12 V 0.8 A or more. Power interface: 5.5 x 2.5 plug. PCB size: 77 x 75 mm / 3.03 x 2.95 inches. Instructions: 1, AC 12 V input: with a DC 5.5 x 2.1 socket and an AC 12 V transformer, you can also use an AC 12 V transformer without a plug.; Description: A tube amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Connect this 6J1 tube preamp between the sound source and it can effectively filter the digital taste. Tube amplifier produces a warmer or more natural tube sound, makes music and the human voice is relatively good. Features: Connect the 6J1 tube preamp between sound source and amplifier to effectively filter the digital taste, the music and human voice will be relatively good. Eight 470 UF capacitor filters are very clean, excellent power supply without humming, filaments are powered by DC 12V and must be connected in series to reduce noise. The coupling capacitor is an electrode-less electrolytic capacitor with high frequency and low resistance. With a DC 5.5 x 2.1 socket and an AC 12 V transformer, you can also use an AC 12 V transformer without a plug. You just need to weld the power cord to the board. This kit comes in individual parts so you can assemble them yourself and enjoy the building process of your own tube amplifier. Specifications: Type: 6J1 tube (replacement model 6AK5, 6AU6, 5654, etc.) Channel types: 2.0 / stereo. Voltage current: AC 12 V 0.8 A or more. Power interface: 5.5 x 2.5 plug. PCB size: 77 x 75 mm / 3.03 x 2.95 inches. Instructions: 1, AC 12 V input: with a DC 5.5 x 2.1 socket and an AC 12 V transformer, you can also use an AC 12 V transformer without a plug.