834mm Tube Sound Amplifier (130x285mm) — Single-Board DIY, 20W (per channel), 4Ω / 8Ω

This single-board tube amplifier features an 834mm classical electronic tube to deliver a warm, rich timbre with layered, detailed sound—perfect for audiophiles and hobbyists who value tube coloration. The board measures 130x285mm and is sized for easy integration into home audio systems. Output power is 20W (per channel), making it suitable for a variety of domestic speaker setups. The amplifier supports driving impedances of 4Ω and 8Ω, ensuring compatibility with most speakers. Assembly is straightforward so even users without professional experience can complete the build; capacitors and resistors are used on the board to maintain stable signal transmission. For servicing or upgrades, components can be freely replaced to tailor or refurbish the unit. Overall, the electronic tube design provides a distinctive, more dimensional sound that enhances playback and vocal performance.