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Cayin C9: Dual Nutube, Fully discrete Fully Balanced Class A/AB Portable Headphone Amplifier Fully balanced, fully discrete, 4-channels high-fidelity headphone amplifier delivers up to 4,100mW (at 16Ω) or 2600mW (at 32Ω) per channel. Select between Vacuum Tube and Solid State timber on both balanced and single-end inputs. The tube timber circuit is designed around a pair of KORG Nutube vacuum tubes. Switch between Pure Class A and Class AB amplification modes.

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