Korg NuTekt HA-S Nutube Headphone Amp Kit

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  • Korg NuTekt HA-S Nutube Headphone Amp Kit
  • Korg NuTekt HA-S Nutube Headphone Amp Kit
  • Korg NuTekt HA-S Nutube Headphone Amp Kit
  • Korg NuTekt HA-S Nutube Headphone Amp Kit
Now: £169.00
Was: £223.00
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Main Features

  • Audiophile headphone amplifier
  • Nutube 6P1 Vacuum Tube
  • Warm, rich harmonic valve sound
  • Powered by two AAA batteries
  • Easy to build kit - no soldering required

The Korg HA-S is a Nutube-equipped DIY Headphone amp kit that will let you enjoy the highest quality audio anywhere.

No soldering is required, so even if you are new to the world of DIY, you will be able to assemble the HA-S to add a warm, analogue tube-driven signal boost to any sound source in no time!

Build Your Own Headphone Amplifier
This DIY HA-S kit allows you to build your very own Headphone amplifier in an easy and fun way, with no soldering required. Not only that, it provides the authentic vacuum tube sound that audiophiles know and love.

Built-in Nutube
Nutube is a new and revolutionary fully analogue vacuum tube developed by KORG INC. and Noritake Itron Corporation. The same as a conventional vacuum tube, Nutube is constructed with an anode, grid and filament, and operates as a complete triode tube, effectively generating the response and same rich harmonic characteristics of conventional vacuum tubes in a more compact, stable and energy-efficient way. The transparent case of the HA-S delivers a glimpse into this technology, allowing the glow of the tube to be visible at all times.

Energy Efficiency
The filament of the Nutube is powered by a DC to DC converter, which consumes less electric current and thus allows for a longer battery life than other vacuum tube equipped amplifiers. The design is so efficient that the HA-S can drive the Nutube with a line voltage of 26 V using only two A4 batteries for a rich and authentic vacuum tube sound.

Sound Possibilities
The HA-S has a special NFB (Negative Feedback) switch, that allows you to choose from a high fidelity clean and pristine sound, or a warmer, more harmonically rich sound as expected from a vacuum tube. When the NFB switch is OFF, the harmonics present in the Nutube (triode tube) will be amplified to create a sound rich in harmonics, warmth and textures. When the NFB switch is ON, the distortion ratio and frequency characteristics will be modified, creating a really detailed and clean sound. For further sound modification, Korg have included two OP amp options for the output: the premium audio oriented 'MUSES01' and the industry standard 'NJM4580', both from JRC. These can be easily replaced so even purist audiophiles will be able to customise and adapt the sound of their HA-S to heir heart's content. For advanced users who want to customise their amplifier even more, the circuit diagrams are readily available, making it really easy to change discrete components and make your own and unique headphone amp matching your desired tone and performance - the possibilities are endless!

Korg HA-S Specifications

Vacuum Tube: Nutube 6P1
Connections: INPUT/OUTPUT stereo minijack
Controls: volume, internal NFB (Negative Feedback) switch
Output impedance 10 ohms recommended load 15 ohms or more
Power 2 alkaline AAA batteries
Autonomy: approx. 9 hours
Dimensions (W x D x H) 111 65 29mm
Weight 110g without batteries)
Included items: manual


This product is in stock and ready to ship

This item is normally sent to Mainland UK addresses by DPD who generally provide a one-hour window of delivery on the morning of delivery by email or text message.

FREE delivery within mainland UK

UK Non-Mainland: from £12

Rep. of Ireland and Mainland Europe: from £15 (calculated at checkout). Please see our international delivery page or contact us for details.

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Warranty Information

Korg Warranty Information: 1 years on most products. Some products have a 3 or 5 year warranty - please see korguk.com for details

Please note this information is provided for guidance only as manufacturer warranties may be updated from time to time. For full please visit the manufacturer's website here:

3 years warranty for VIP members

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Additional Information

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