KORG / HA-S

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Nu:tekt HA-S is a DIY kit that allows you to build a high-quality headphone amplifier equipped with Nutube. No soldering is required, so it's easy even for beginners. It can be assembled quickly and you can enjoy your favorite music with high quality sound.

■ Make your own headphone amplifier
・The Nu:tekt HA-S headphone amplifier DIY kit does not require soldering and allows you to easily create a headphone amplifier.

■ Equipped with Nutube
・Nutube is a fully analog, next-generation, high-performance vacuum tube jointly developed by KORG and Noritake Electronics.

■ Energy saving
・By using a DC-DC converter, it efficiently converts when generating filament power from batteries. With just two AA batteries, you can create a 26V line voltage to drive Nutube, achieving a rich, authentic vacuum tube sound!

■ Possibilities of tone
・HA-S is equipped with an NFB (negative feedback) switch. You can switch between a clean, clear sound and a warm, vacuum tube-like warm sound.
・When the negative feedback switch is OFF, the circuit becomes feedback-free, and the harmonics of the Nutube (triode) are enhanced, producing a richer sound with a stronger vacuum tube color. Turning on the NFB switch reduces distortion and harmonics, resulting in a more ""hi-fi"" sound.

- Two types of output stage op-amps are included to change the sound. JRC's premium audio-oriented ""MUSES01"" and the orthodox ""NJM4580"". These can be easily replaced using IC sockets.

- A circuit diagram is included, allowing you to customize the amplifier. By changing the parts to higher quality parts, you can easily create your own headphone amplifier that matches your desired tone and performance, with endless possibilities.

■Vacuum tube: Nutube 6P1
■Connection terminals: INPUT/OUTPUT terminals, stereo mini phone jack
■Controls: Volume, NFB switch (internal)
■Output impedance: 10Ω, recommended load 15Ω or more
■Power supply: 2 AA alkaline batteries (sold separately)
■Battery life: Approximately 9 hours (when using alkaline batteries)
■External dimensions: 111 (width) x 65 (depth) x 29 (height) mm
■Weight: 110 g (excluding batteries)
■Accessories: Instruction manual