Bewinner 6J1-2 Tube Board Acrylic Board, Audio Power Amplifier for 3.5Mm Headphone, Amplifier Receivers Preamplifier Board for HiFi Player, Mobile Pho

This is a preamplifier + headphone amplifier that can be used with a post-amplifier or an active speaker, or it can be used with headphones. 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! Specification: Material: acrylic Input port: audio input, power input Output port: 3.5MM headphone output, preamp output Size: 12.5 * 7.6 * 3.5cm / 4.9 * 3.0 * 1.4in (assembled size) Weight: approx. 259g Packing List: 1 * Acrylic Board 1 * 6J1-2 Tube Board