User Manual

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Thank you for purchasing the Nu:Tekt HA-S.
To help you get the most out of your new headphone amp, please read this
manual carefully.
Main features
• The HA-S is a kit to assemble a hi-fi headphone amp that utilizes a Korg
Nutube vacuum tube.
• Although this headphone amp is powered with only two batteries, it can
drive the Nutube with a line voltage of 26 V for an authentic vacuum
tube sound.
• The filament is powered by a DC to DC converter, which consumes less
electric current.
• An NFB (negative feedback) switch is used, which lets you switch the NFB
circuit on and off as you like.
• The headphone amp output uses an IC socket, which allows the
operational amplifier to be replaced. Two types of operational amplifiers
are included.
• The Nutube anode load resistance value can be adjusted, letting you
enjoy different sounds by changing the steepness of the load curve for
the vacuum tube.
• This unit is shaped like a mint can case, which is familiar to fans of these
kinds of cases. —The unit also includes a protector for the power switch.
• An acrylic cover is provided that features the Nu:Tekt design, letting you
see the light from the Nutube through the cover.
About Nutube
Nutube is a new vacuum tube developed by KORG INC. and Noritake Itron
Corporation and that utilizes technology from vacuum fluorescent displays.
As with conventional vacuum tubes, the Nutube is constructed with an
anode, grid and filament, and operates as a complete triode tube.
Furthermore, it generates the response and same rich harmonic character
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istics of conventional vacuum tubes.
If a strong impact is applied to this unit, high-frequency noise may be
output. This is due to the structure of the Nutube; it is not a
malfunction.