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Korg HA-S Nutube Headphone Amplifier DIY Kit
Product #65498 | SKU HA-S
In stock Ships tomorrow
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Korg HA-S Nutube Headphone Amplifier DIY Kit

Product #65498 | SKU HA-S
In stock Ships tomorrow

Product Features
  • No Soldering Required.
  • Nutube 6P1 Triode Tube.
  • Battery Operated.
  • Switchable Negative Feedback Circuit.
  • Clean & Pristine or Harmonically Rich.
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Product Details
  • Product: #65498
  • SKU: HA-S
Our Price $409.00
- +
or 12 months interest free with
or 6 weekly payments from $68.16

Delivery - $3.90*
Ships tomorrow
2 - 3 working days
1 - 2 working days
*estimated shipping to Auckland


The Korg HA-S Nutube Headphone Amplifier DIY Kit features audiophile components, injecting warm, analogue tube-driven signal boost to any sound source. With no soldering required, the HA-S is simple to assemble, so you can quickly and easily enjoy quality audio anywhere.

Developed by Korg and Noritake Itron Corp, the Nutube is a miniaturised fully analogue vacuum tube constructed with anode, grid, and filament, operating like a conventional vacuum tube in a more compact, stable, and energy efficient way. What's more, you can further customise the HA-S by switching the negative feedback (NFB) circuit in or out of the signal path, allowing for a clean, pristine, and high-fidelity sound, or a more harmonically rich tone. Also included are two OP amps for further modifications. Advanced users will appreciate the available circuit diagrams for switching out discrete components.

Key Features:

Build Your Own Headphone Amplifier
  • DIY kit allows you to build your very own headphone amplifier.
  • No soldering needed.
  • Authentic vacuum tube sound.
Built-In Nutube
  • Fully analogue vacuum tube utilising the same components as a conventional vacuum tube.
  • Constructed with an anode, grid, and filament, and operates as a complete triode tube.
  • Generates the same response and rich harmonic characteristics of conventional vacuum tubes.
  • Compact, stable, and energy efficient.
  • Transparent case allows the glow of the tube to be visible at all times.
Energy Efficient
  • Powered by a DC to DC convertor.
  • Consumes less electric current for a longer battery life.
  • Efficient design utilises a 26V line voltage using only two A4 batteries.
Customisable Sound and Modifications
  • Negative Feedback (NFB) circuit allows for a clean, pristine, and¬†high-fidelity¬†sound, or a warmer, more harmonically rich sound as expected from a vacuum tube.
    • NFB Switch Off: Harmonics present in the Nutube (triode tube) will be amplified to create a sound rich in harmonics, warmth, and textures.
    • NFB Switch On: Distortion ratio and frequency characteristics will be modified, creating a detailed and clean sound.
  • Sound Modification.
    • Two OP amp output options included.
    • JRC MUSE01: Premium audio oriented.
    • JRC NJM4580: Industry standard.
  • Customise and adapt the sound.
    • For advanced users.
    • Circuit diagrams available.
    • Easily change discrete components to make your own unique headphone amp matching your desired tone and performance.


Vacuum Tube Nutube 6P1
Connections Input/Output: 2 x 1/8" / 3.5 mm Stereo Mini-Jack
Controls Volume, Internal Negative Feedback (NFB) Switch
Impedance Output Impedance: 10 Ohms
Recommended Load: 15 Ohms or More
Power 2 x AAA Alkaline Batteries
Battery Life 9 Hours Approximately
Dimensions (W x D x H) 4.4 x 2.6 x 1.1" / 111.0 x 65.0 x 29.0 mm
Weight Without Batteries: 3.9 oz / 110.0 g

In The Box

  • Korg HA-S Nutube Headphone Amplifier DIY Kit.


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  • Product: Korg HA-S Nutube Headphone Amplifier DIY Kit
  • Manufacturer: Korg
  • Model: HA-S
  • SKU: HA-S
  • RM Product #: 65498