Nutube is a small, vacuum tube-based audio device developed by Korg and New Japan Radio, designed to deliver the warm sound characteristic of traditional vacuum tubes while being more compact and energy-efficient. It combines the benefits of solid-state technology with the tonal qualities of vacuum tubes, making it suitable for various audio applications, including guitar amplifiers and hi-fi audio systems. Nutube is known for its low power consumption and long lifespan compared to conventional vacuum tubes.