Professional 834mm Tube Amplifier Kit for Singing & Playback — Single-Board 130x285mm, 20W (per channel), 4Ω/8Ω

Built around an 834mm electronic tube, this single-board amplifier delivers the warm, rich timbre of classic tube circuits to bring out more delicate musical detail — a great choice for sound lovers and hobbyists. The compact 130x285mm board provides 20W (per channel) output power, making it suitable for a variety of home audio systems. Speaker compatibility is broad thanks to support for 4Ω and 8Ω loads, meeting different user needs. Assembly is simple and accessible even to those without professional experience; the layout also makes future maintenance and component upgrades straightforward so users can freely replace parts as required. High-quality capacitors and resistors are used throughout to ensure stable signal transmission. By using electronic tubes the design achieves a distinctive, layered sound that enhances overall audio quality.