6J1/6J2/6K4 Tube Fever Pre Amplifier Headphone Buffer DIY Kit Module Stereo Potentiometer AC 12V Valve-6K4 Kit for $27.66

Description: 1. Circuit parameters Model: 6j1 or 6j2 or 6k4 tube Channel type: 2.0/stereo Working voltage: AC AC12V at least 0.8A or above Power interface: 5.5*2.5 plug Circuit board size: width 77 x depth 75 x height 57MM Whole machine weight: 87 grams (with copper pillar) Bile preamplifier and bile buffer function: add between digital audio sources such as CD/VCD/DVD/MP3/IPHONE/ipad/MID/mobile phones and other digital audio sources and power amplifiers/subwoofers/active speakers to easily realize the bile front and back The best combination of digital and transistor sound that are tiresome to listen to for a long time disappear immediately which can make the whole listening system appear a sweet and delicate guts with a round tone and a sweet voice The characteristic of strong musical taste. The working principle of the power supply: When the power is turned on the tube filament starts to heat up. At this time the boost starts from zero voltage. When the tube filament is hot the boost is just completed so this is the same as the bile rectifier 8 470UF The capacitor filter is very clean and the excellent power supply system will not have hum the filament is DC 12V power supply the filaments of two tubes are connected in series and the DC filament is also used to reduce noise. Instructions: 6J1 tube buffer 0.85 times magnification connected between the sound source and the pre-stage or post-stage can effectively filter the digital taste the human voice is better and the bile taste is strong. 1. AC 12V input: Use a DC5.5*2.1 socket and an AC 12V transformer. If you want to use a plugle AC 12V transformer you need to solder the power cord to the circuit board. Remember: DC power input cannot be used otherwise it will not work! 2. Channel input: It is the audio signal input terminal which can be connected to mobile phones computers M3 MP4 and other music players. 3. Channel output: It is the audio signal output terminal which can be connected to the audio signal input terminal of the power amplifier and power amplifier board to provide boldne to the subsequent power amplifier Full music enjoyment! 4. Power switch/volume knob: Turn the knob counterclockwise and just start to decrease the volume. When the volume is turned to the minimum if you continue to rotate until a tick then the power is turned off and the indicator light goes out; in the off state Turn the knob clockwise and hear a tick sound. The indicator light is on indicating that the power has been turned on. At this time the volume is at the minimum. If you continue to turn it clockwise you will increase the volume. Note:English vocabulary is very bad if the meaning is confused please understand! Thank you!