XDUOO Vacuum Tube Headphone Amplifier TA-02SJ The RCA cable was broken, so I replaced it (photo 2). It works perfectly. I have never experienced any issues such as the power turning off while using it. Price reduced from ¥12222 to ¥11111 on 11/1. I'm not planning on lowering the price for a while, so please be understanding. Output power: 780mW (32Ω load) Frequency response: 10Hz～100kHz (±0.5dB) Gain: +15dB THD+N: 0.1% (1kHz) S/N: 110dB Supported headphones: 16Ω～600Ω Dimensions: 151 x 84 x 70 (mm) *Weight: 260g (excluding vacuum tube)