Features: Refer to the new design of domestic and foreign circuits, using the classic name of the noble voice 300B for power amplification, 6N8P preamplifier, shuguang rectifier tube, Thick aluminum alloy panel, Classical double VU meter, Solid aluminum knob, 3 channels of audio input switching, Fever grade pure copper plated socket Pure copper plated crystal terminal, Imported fever-grade capacitors Performance parameters: Rated output power: 9W × 2 Frequency response: 20Hz--25KHz Total harmonic distortion: < 1% (1kHz) Input sensitivity: 500mV--2000mV Input impedance: 100KΩ Output impedance: 4Ω, 8Ω Signal to noise ratio: 88dB Power Supply Voltage: AC 100V - 240V / 50Hz-60Hz Volume (width × depth × height): 370 × 250 × 200mm Net weight: 19kg Package weight: 20Kg Pre-stage tube: 6N8P × 2 /6H8C X2 After-stage power tube: PSVANE 300B-se×2 Rectifier: shuguang 5Z3PAT/5U4G