This is a preamplifier that can be used with a post-amplifier or active speaker. The sound of this board is warm, mellow, sweet and transparent, and full of music. It is a cost-effective preamplifier. Replaceable op amp and upgrade the tube, just plug it in the direction of the foot. Let you enjoy DIY fun!

Features:
1. Carefully debugged circuit with stable performance, quiet and no noise.
2. Adopt 6J1 electron tube, classic collocation.
3. DC12V DC power supply, internal stable boost to 100V to ensure the performance of the tube.
4. The headset can be pushed to 300 ohms, the general recommendation is 16-150 ohms.
5. A cost-effective preamplifier with warm, mellow, sweet and transparent sound.

Specification:
Material: acrylic
Input port: audio input, power input
Output port: 3.5MM headphone output, preamp output
Size: 10.5 * 7.5 * 2.5cm / 4.1 * 3.0 * 1.0in (assembled size)
 Weight: approx. 236g

Packing List:
2 * Acrylic Board
1 * 6J1 Tube Board
1 * Screw Kit