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Korg hi-fi system Nu:Tekt HA-S

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E J 4

2019

HA-S

NUTUBE HEADPHONE AMPLIFIER KIT

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 administra-

tive 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 intend-

ed 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.

Produktspecifikationer

Varumärke:	Korg
Kategori:	hi-fi system
Modell:	Nu:Tekt HA-S
Vikt:	430 g
Bredd:	77 mm
Djup:	121 mm
Internationell säkerhetskod (IP):	IP20
Hållbarhetscertifikat:	RoHS
Uteffekt:	65 W
Spännande:	62 V
AC-ingångsspänning:	180 - 295 V