banggood 6J1 Valve Tube Preamplifier Board Module Instructions

September 11, 2024
banggood

banggood 6J1 Valve Tube Preamplifier Board Module

How the power supply works

Turn on the power, and the tube filament begins to heat up. At this time, the voltage starts to increase from zero voltage. When the tube filament heats up, the voltage boost is just completed. It is the same as the tube rectifier. The eight 470UF capacitors filter very cleanly. An excellent power supply system cannot There will be hum, and the filament is powered by DC 12V. The filament that requires two tubes is connected in series. The DC filament is also used to reduce noise. ​ Materials used: The coupling capacitor adopts Taiwan’s FARAD non-polar capacitor MET series, high-frequency low-resistance electrolytic capacitor, 1% precision metal film resistor, and Beijing J-class military-standard electronic tube 6J1.

Parameter

[Model number] 6j1 tube preamplifier (replaceable models 6AK5, 6AU6, 5654, etc.) Please refer to relevant information for details [Power input] AC AC12V 0.8A /5.5*2.5 plug power supply or transformer (DC is not supported)  [Channel type] 2.0/stereo [Knob function] Power switch/volume adjustment [Magnification] 0.85 times amplification

Instructions

  1. AC 12V input: Use DC3.5/5.5*2.1 socket and AC 12V/0.8A power adapter. If you want to use a plug-free AC 12V transformer, you need to solder the power cord to the circuit board. Remember: Do not use DC power input, otherwise it will not work!
  2. Left channel input/right channel input: It is the audio signal input terminal and can be connected to mobile phones, computers, M3, MP4, and other music players.
  3. Left channel output/right 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 the subsequent power amplifier with bold music enjoyment!
  4. Power switch/volume knob: Turn the knob counterclockwise to begin to reduce the volume. When the volume is turned down to the minimum, if you continue to rotate it until a “ticking” sound is heard, the power is turned off and the indicator light goes out; in the off state, Turn the knob clockwise until you hear a “tick” sound and the indicator light lights up, indicating that the power is on. The volume at this time is the minimum. Continue to turn the knob clockwise to increase the volume.

Gallbladder preamplifier and gallbladder buffer functions:
Added 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, it is easy to achieve the best match between the first and the last. The annoying “digital smell” and “transistor sound” of listening to music will disappear immediately, and the entire listening system will have a sweet and delicate “bile smell” with the characteristics of mellow timbre, sweet vocals and strong musical flavor.

How to implement the headphone amplifier function
Some friends hope that this product can directly drive headphones. This product is designed without a headphone amplifier function. Here is a solution. If the input audio is a signal that can drive headphones, then the output signal can also drive headphones, but the output sound is slightly smaller than the digital sound source. If friends can accept this method, then you can give it a try. After the sound source processing of this product, the sound of the headphones will be better. There will also be a sweet and delicate “bile smell”.

Components list

Component Name QTY. Component Name QTY.
R1 2.2     ohm          2W resistor 1 R13, R18
R3, R7 1/4W resistor 1K 2 R16, R21
R2, R6, R12, R15, R17, R20 1/4W resistor 4.7K 6 C1, C2, C3, C4, C5, C6, C7,
C8 Electrolytic                 capacitor 470uf/35V 8
R4, R5, R8, R9 1/4W resistor 47 ohms 4 C9, C10, C11, C12
capacitor 1Uf/50V 4
R10, R11 1/4W resistor 2.2K 2 C13
470uf/16V 1
R14, R19 1/4W resistor 200 ohms 2 D1 – D5
TR1, TR2 Transistor D667 2 Electron tube 6J1
TR3, TR4 Transistor B647 2 7-pin            electronic tube holder
2-digit RCA Lotus 2-digit RCA Lotus 2 LED 3MM
Potentiometer B50K                double potentiometer with switch 1 3.5
Power socket   1
PCB PCB 1  

Schematic

Installation wiring diagram

Specifications

  • Model Number: 6j1 tube preamplifier (replaceable models 6AK5, 6AU6, 5654, etc.)
  • Power Input: AC12V 0.8A /5.5*2.5 plug power supply or transformer (DC is not supported)
  • Channel Type: 2.0/stereo
  • Knob Function: Power switch/volume  adjustment
  • Magnification: 0.85 times amplification

Frequently Asked Questions (FAQ)

1. Can this preamplifier work with DC power input?
No, the preamplifier only supports AC power input of AC12V 0.8A with a 5.5*2.5 plug power supply or transformer.

2. Can I replace the electron tube in this preamplifier?
Yes, the electron tube in the preamplifier is replaceable with compatible models like 6AK5, 6AU6, 5654, etc. Refer to relevant information for detailed instructions on tube replacement.

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