Build Your Own Korg HA-S Headphone Amplifier

Korg’s HA-S ($249) is a Nutube-equipped DIY stereo headphone amplifier kit that will let you enjoy high 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, analog tube-driven signal boost to any sound source in no time! Nutube is a fully analog vacuum tube developed by Korg 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.
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