Korg Ha-s User Manual
2019
HA-S
NUTUBE HEADPHONE AMPLIFIER KIT
EJ 2
Table of Contents
Main features .......................................................................2
Cautions Before Assembly.................................................5
Tools to prepare................................................................................... 5
Checking the parts .............................................................................. 5
Assembly .............................................................................6
Preparing the main circuit board and Nutube circuit board ..... 6
Install the main circuit board into the case .................................. 8
Part Names and Functions ............................................... 11
How to Use the Nu:Tekt HA-S ........................................... 11
Adjusting the main circuit board .....................................11
Troubleshooting ................................................................. 12
Replacing the operational amplifier ................................ 12
Specifications .................................................................... 12
Mounting Diagram ............................................................. 13
List of mounted parts ....................................................... 14
CIRCUIT DIAGRAM ........................................................... 16
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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
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.
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Precautions
Location
Using the unit in the following locations can result in a malfunction.
• In direct sunlight
• Locations of extreme temperature or humidity
• Excessively dusty or dirty locations
• Locations of excessive vibration
• Close to magnetic fields
Power supply
Be sure to turn the power switch to OFF when the unit is not in use. Remove
the battery in order to prevent it from leaking when the unit is not in use for
extended periods.
Handling
To avoid breakage, do not apply excessive force to the switches or controls.
Care
If the exterior becomes dirty, wipe it with a clean, dry cloth. Do not use
liquid cleaners such as benzene, alcohol or thinner, or cleaning compounds
or flammable polishes.
Keep this manual
After reading this manual, please keep it for later reference.
Keeping foreign matter out of your equipment
Never set any container with liquid in it near this equipment. If liquid gets
into the equipment, it could cause a breakdown, fire, or electrical shock. Be
careful not to let metal objects get into the equipment.
Notice regarding disposal (EU only)
If this symbol is shown on the product, manual, battery, or package,
you must dispose of it in the correct manner to avoid harm to human
health or damage to the environment. Contact your local administrative body for details on the correct disposal method. If the battery
contains heavy metals in excess of the regulated amount, a chemical
symbol is displayed below the symbol on the battery or battery package.
IMPORTANT NOTICE TO CONSUMERS
This product has been manufactured according to strict specifications and
voltage requirements that are applicable in the country in which it is intended that this product should be used. If you have purchased this product via
the internet, through mail order, and/or via a telephone sale, you must
verify that this product is intended to be used in the country in which you
reside.
WARNING: Use of this product in any country other than that for which it
is intended could be dangerous and could invalidate the manufacturer’s or
distributor’s warranty. Please also retain your receipt as proof of purchase
otherwise your product may be disqualified from the manufacturer’s or
distributor’s warranty. Company names, product names, and names of
formats etc. are the trademarks or registered trademarks of their respective
owners.
* All product names and company names are the trademarks or registered
trademarks of their respective owners.
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Cautions Before Assembly
Be careful of injury when handling parts
Use caution not to injure yourself due to the protruding parts when
handling the circuit board. Use cotton work gloves to protect your hands
when working. Also, be sure to wash your hands thoroughly after working.
Tighten screws and nuts at a perpendicular angle
Tightening screws and nuts that are inserted diagonally may damage the
threads, making it impossible to tighten them again. Be sure to tighten
screws so that they are inserted perpendicular to the surface.
Use caution, as applying too much torque and tightening the screws too
tightly may damage the parts.
Do not injure yourself or scratch the surface with the
tools.
When using tools to tighten screws and nuts, make sure not to injure
yourself, such as by getting your fingers pinched. Work carefully to avoid
scratching the case or circuit board with the tools.
Provide a sufficiently large work space to complete the assembly procedure,
and prepare work mats so parts will not be scratched.
Avoid losing the screws and nuts
Handle the screws and nuts with caution, to avoid losing them. Do not use
other screws or nuts aside from the ones included with this kit, and do not
use the screws and nuts included with this kit for any other purpose.
Tools to prepare
You will need the following tools in order to assemble this kit.
Note: You will also need the AA alkaline batteries and so on. These items are
not included, so please obtain them separately.
• Precision screwdriver (Phillips head No. 0, No. 1, flathead 2.4 mm)
Use a screwdriver that matches the size of the screw. Using the wrong
size of screwdriver may damage the screw or make it impossible to
tighten.
• Wrench (two-sided, 10 mm wide)
Checking the parts
Before assembly, make sure that all parts are on hand. (Page 6, Page 8)
Contact us at www.nutekt.org if any parts are missing or damaged.
TIP If you are concerned about whether you can assemble this kit or
whether you might make a mistake, refer to the video explanations
available on the Web (www.nutekt.org), or use our assembly service
support (chargeable).
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