Real power: undistorted 200W, 300W Power supply: dual supply designed, range 2090V. The upgraded version has optimized the circuit and parts, but for direct voltage use it is recommended to operate below 90V and not push the voltage limit. Circuit design and output stage: The circuit design uses A970/C2240 current tube pair in a doubledifferential configuration and A1145/C2705 for voltage amplification to drive the powertube pair A1837/C4793. The output stage uses the powertair tubes A1943/C5200. Performance and compatibility: Can operate within a 2090V range; with sufficient power, it can easily reach 200W, delivering good sound quality and strong driving capability, and it can push a 15inch loudspeaker without strain. Use scenarios Home audio with large floorstanding speakers: delivers clean headroom and powerful, undistorted output for a fidelity listening experience in a living room or dedicated listening space. Studio or rehearsal room: robust tubebased amplification that handles dynamic material and provides reliable drive for large speakers in compact spaces. DIY/hifi tube projects: suitable as a current power stage for enthusiasts building or upgrading tubeaudio systems that require substantial current delivery to large drivers.