banggood 6J1 Valve Tube Preamplifier Board Module Instructions
- September 11, 2024
- banggood
Table of Contents
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
- 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!
- 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.
- 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!
- 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.