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Features:
1. Utilizes a 6J1 tube amplifier design for warm, refined sound quality, delivering an immersive high-fidelity listening experience.
2. Unique 12V AC input power supply supports multiple power adapters for flexible and stable compatibility.
3. Built-in positive/negative voltage and filament power circuits with power purification processing effectively reduce noise interference.
4. Supports stereo 2.0 inputs, compatible with mainstream devices like smartphones and computers for easy connectivity.
5. DIY-assembled preamp board, ideal for audiophiles to build their own custom high-end preamp.

Specifications:
Channel Type: 2.0 / Stereo
Input Power: DC12V 1A / 5.5×2.1mm plug
Knob Function: Power Switch / Volume Control
Mainboard Dimensions: 77mm × 75mm × 52mm

Key specifications for the 6J1 vacuum tube:
Filament Voltage & Current: 6.3V, approx. 170mA
Screen (Anode) Voltage & Current: 120V, approx. 7.35mA
Second Grid Voltage & Current: 120V, approx. 3.2mA
Transconductance: 5.2 mA/V, indicating the control capability of anode current by grid voltage variation
Cathode Resistance: 200Ω
Input Resistance: Greater than 12kΩ

Instructions:
1. 12V AC Input:
Use a DC 5.5×2.1mm jack. A 12V AC power adapter is acceptable. Alternatively, you may use a 12V AC transformer. If using an AC transformer, the power cord must be soldered to the circuit board. Remember: Do not use DC power input, as it will not function!
2. Left Channel Input / Right Channel Input:
Audio signal inputs. Connect to music players such as phones, computers, M3 players, MP4 players, etc.
3. Left Channel Output / Right Channel Output:
Audio signal outputs connect to audio signal input amplifiers or power amplifier boards, delivering rich, immersive music enjoyment!
4. Power Switch / Volume Knob:
Turn the knob counterclockwise to decrease volume. When volume reaches minimum, continue turning until a “click” sound occurs, then power shuts off and the light turns off.
When powered off, turn the knob clockwise until you hear a “click” sound. The light will turn on, indicating power is engaged, with the volume set to minimum. Continue turning clockwise to increase the volume.

Package Includes:
1x Tube Preamp Board (Unsoldered, Requires DIY Assembly)

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Refund

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If the item is defect when you receive it or you are not satisfied with it, please return it within 14 days for a replacement or money back. But the items must be back in factory condition. Please contact us and double check the return address before you return it.
If is item is defective in 12 months, you can return it to us. We will send you a new replacement after receiving the defective item.