Revolutionary pocket-sized tube magic returns with the Cayin RU9 – the world’s first Korg NuTube 6P1 dongle featuring genuine triode warmth, three distinct timbre modes and up to 1000 mW of pure balanced power.

Dual AK4493SEQ DACs, 32-bit/768 kHz & DSD512, 5th-gen NuTube circuit, selectable Classic Tube / Modern Tube / Solid-State signatures and Hyper DC mode make RU9 the ultimate portable statement of musicality and raw drive.

• Tube: 5th-gen Korg NuTube 6P1 triode (Classic & Modern modes)
• Solid-State Mode: Ultra-clean OPA1662 circuitry
• DAC: Dual mono AKM AK4493SEQ + 16-core XMOS XU316
• Max Power (4.4 mm Hyper DC): 1000 mW @ 32 Ω
• Max Power (4.4 mm BAT): 620 mW @ 32 Ω
• Single-Ended (3.5 mm): Up to 420 mW @ 32 Ω
• Native Support: PCM 32-bit/768 kHz, DSD512
• Outputs: 3.5 mm SE + 4.4 mm balanced (both usable as Line-Out)
• Volume Control: 100-step NJW1195 precision resistor ladder
• Battery: 2000 mAh, up to 4.7 h playtime
• Build: CNC aluminium body, magnetic phone mount, only 150 g