Korg Nu:tekt OD-KIT User manual

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EJ 1
2018
OD-KIT
This kit is intended for those who have experience building elec-
tronic kits and who have a basic understanding of soldering and
electronic parts.
If you make a mistake during assembly, connected devices may be
damaged, or the electronic parts in this kit may be damaged or
become hot.
After assembling this kit and before turning on the power, make
sure to check for any mistakes in mounting or imperfect solder
points.
Table of Contents
Precautions................................................................2
Cautions Before Assembly.......................................3
Tools to prepare ......................................................................3
Checking the parts .................................................................3
Parts and materials ............................................................... 4
Main features.............................................................5
About Nutube ..........................................................................5
What is “Nu:Tekt”?..................................................................5
Part Names and Functions ......................................6
Specifications............................................................6
List of mounted parts...............................................7
Mounting Diagram.....................................................9
Mounting the Circuit Board ................................... 10
Building the main circuit board ......................................... 10
Building the Nutube circuit board unit ............................ 12
Parts List ..................................................................13
Assembly ................................................................. 14
Operation Check...................................................... 16
Troubleshooting .................................................................... 16
Adjusting and setting the main circuit board................. 16

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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
Please connect the designated AC adapter to an AC outlet of the correct
voltage. Do not connect it to an AC outlet of voltage other than that for which
your unit is intended.
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 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. If something does
slip into the equipment, unplug the AC adapter from the wall outlet. Then
contact your nearest Korg dealer or the store where the equipment was pur-
chased.
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 in-
tended 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 a battery, solder, glue, adhesive tape and so on.
These items are not included, so please obtain them separately.
• Soldering iron
• Nippers, needle-nose pliers, tweezers
• Phillips head screwdriver (No. 2), precision flathead screwdriver (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.
• Spanner, wrench (two-sided, 10 mm/11 mm/14 mm wide)
• Tester
Checking the parts
Before assembly, make sure that all parts are on hand.
Contact us at www.nutekt.org if any parts are missing or damaged.
Caution when painting the case
Make sure not to get any paint on the areas on the case that come into
contact with the volume controls.
The case and volume controls should conduct electricity.

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Parts and materials
Resistance color code chart
Value
Multiple
Precision Value
Multiple
Precision
Color Brown Red Orange Yellow Green Blue Purple Gray White Black Gold Silver
Value 1234567890----
Multiple x10 x10
2
x10
3
x10
4
x10
5
x10
6
x10
7
x10
8
x10
9
x1 x0.1 x0.01
Precision ±1% ±2% ±0.05% -- ±0.5% ±0.25% ±0.1% -- -- -- ±5% ±10%
Reading the capacitor values
• When the value “103” is shown
10 x 10
3
= 10000 pF = 0.01 μF
• When the value “222” is shown
22 x 10
2
= 2200 pF = 0.0022 μF
List of the capacitor shapes
Film capacitorCeramic capacitor
Example
Brown Brown
Gold
Black
Value Brown Black 10
Multiple Brown x10
Precision Gold ±5%
Resistance 100Ω±5%

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Thank you for purchasing the Nu:Tekt OD-KIT. To help you get the most out
of your new instrument, please read this manual carefully.
Main features
• The Nu:Tekt OD-KIT is a kit used to assemble effectors that use the
Nutube.
• You can select the parts to solder and create one of three different
effectors, each with a different kind of distortion.
First, decide on the kind of effector you wish to make.
CLEAN (CL): A clean boost sound with only a small amount of
distortion.
OVERDRIVE (OD): An all-purpose overdrive sound, with a characteris-
tic crunch and a suitable amount of distortion.
DISTORTION (DS): A sound that offers harder distortion.
• This kit includes a SHAPE knob, which allows you to easily change the
distortion waveform.
• You can switch the Nutube to either Single or Double mode, to select the
tonal character you like.
• The operational amplifier uses an IC socket, and thus can be easily
replaced.
• A machined aluminum die-cast case is included.
• 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, or use our assembly service support (chargeable).
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, noise at the high-frequency
range may be output. This is due to the structure of the Nutube; it is
not a malfunction.
What is “Nu:Tekt”?
Nu:Tekt is an dedicated brand for kits, marketed by electronic musical
instrument manufacturer Korg. Nu:Tekt offers sales and service for a unique
brand of kits beginning with the new “Nutube” vacuum tube as well as
musical instruments and audio devices, made possible through Korg’s
experience as a musical instrument manufacturer.
Nu:Tekt web site: www.nutekt.org

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Part Names and Functions
1
OUTPUT INPUTDC9V
2
4
3
5
6
1. VOLUME knob: Adjusts the overall volume.
2. TONE knob: Turn this knob clockwise for a sharper sound, and
counter-clockwise for a more full-bodied sound.
3. SHAPE knob: By changing the anode resistance value of the Nutube, the
distortion waveform will change, letting you enjoy harmonic and distortion
changes.
Tip: With a DISTORTION circuit, it may seem that the volume is decreasing
when you turn the SHAPE knob to the right. However, this is a normal
characteristic of the TONE circuit.
4. GAIN knob: Used to adjust the amount of distortion.
Tip: Flipping the slide switch on the main circuit board to Double will give
you a two-series circuit, adding gain and volume.
5. EFFECT ON/OFF switch: Switches the effector on/off.
6. EFFECT ON/OFF LED: The indicator lights when the effector is on.
Specifications
· Vacuum tube: Nutube 6P1
· Connectors and jacks: INPUT jack (monaural phone jack), OUTPUT jack
(monaural phone jack), DC 9V jack ( )
· Power: 9V alkaline battery (6LF22/6LR61) (sold separately), or DC 9V
AC adapter (sold separately)
· Battery life: Approx. 18 hr. (in Single mode, using an alkaline battery);
approx. 10 hr. (in Double mode, using an alkaline battery)
· Current consumption: 28 mA (Single), 46 mA (Double)
· Dimensions (W x D x H): 120 x 96 x 55 mm /4.72" x 3.78" x 2.17"
· Weight: 340 g / 12 oz.(without batteries)
· Included items: Owner’s Manual
· Optional accessories: KORG AC adapter KA181 (DC 9V )
* Specifications and appearance are subject to change without notice
for improvement.

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List of mounted parts
Part number Circuit number Part name Model Rating Quantity
1 U3 3-terminal regulator LP2950L－3.3V 1
2 U1 Operational amplifier NJM072D 1
3 U1S Operational amplifier
socket 6pin Socket 1
4 Q1, Q2 J-FET 2SK303L 2
5 D1 Schottky barrier diode 1S30 (R-1) 1
6 ZD1 Zener diode GDZJ4．7C 1
7 C2 Film capacitor
CL 0.1μF 1
OD 0.01μF 1
DS 0.01μF 1
8 C19 Film capacitor
CL OPEN 1
OD OPEN 1
DS 1μF 1
9 C8 Film capacitor
CL 1μF 1
OD 0.047μF 1
DS 0.047μF 1
10 C9A Film capacitor 0.0022μF 1
11 C9B Film capacitor
CL OPEN 1
OD OPEN 1
DS 0.01μF 1
12 C16 Film capacitor
CL OPEN 1
OD 0.22μF 1
DS 0.0082μF 1
13 C10, C25 Ceramic capacitor 100PF B 2
14 C5 Film capacitor 0.01μF 1
15 C14, C17,
C20, C21 Ceramic capacitor 0.1μF 4
16 C6 Film capacitor 0.1μF 1
17 C4, C11,
C15, C22 Film capacitor 1μF 4
18 C24 Electrolytic capacitor 47μF/16V 1
19 C1, C12,
C18, C23 Electrolytic capacitor 100μF/16V 4
20 C3, C13 Electrolytic capacitor 330μF/25V 2
21 R19 Resistor
CL OPEN 1
OD OPEN 1
DS 4.7KΩ 1
22 R20 Resistor
CL 0Ω 1
OD 0Ω 1
DS 15kΩ 1
23 R21 Resistor
CL OPEN 1
OD OPEN 1
DS 0Ω 1
24 R22 Resistor
CL OPEN 1
OD OPEN 1
DS 0Ω 1
25 R23 Resistor
CL 0Ω 1
OD 0Ω 1
DS OPEN 1
26 R24 Resistor
CL 0Ω 1
OD 0Ω 1
DS OPEN 1
CL: CLEAN
OD: OVERDRIVE
DS: DISTORTION

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27 R16 Resistor
CL 10kΩ 1
OD 240Ω 1
DS 15kΩ 1
28 R2 Resistor 10Ω 1
29 R3 Resistor 100Ω 1
30 R17, R28 Resistor 150Ω 2
31 R18 Resistor 1kΩ 1
32 R15, R27 Resistor 2.4kΩ 2
33 R10 Resistor 4.7kΩ 1
34 R12 Resistor 6.8kΩ 1
35
R4, R5, R6
Resistor 10kΩ 3
36 R13, R25 Resistor 33kΩ 2
37 R9 Resistor 51kΩ 1
38 R11, R14,
R26 Resistor 100kΩ 3
39 R1, R7 Resistor 2MΩ 2
40 L1, L2 Inductor BL01RN1A2A2B 2
41 CN8 Connectors B2B－PH－K－S1
42 CN7 Connectors B8B－PH－K－S1
43 CN1, CN2 Connectors B8B－ZR－3．4 2
44 CON1 DC jack PJ30KM0BB140－69B 1
45 J1, J2 Phone jack LJB0664－62
46 SW2 Slide switch MS－22D10 1
47 V1 Nutube (vacuum tube) Nutube 6P1 1
48 VR1, VR5 Volume control 10K A 2
49 VR2 Volume control 100K A 1
50 VR3
Trimmer Potentiometer 10K B 1
51 VR4 Volume control 500K B 1
52 Harness A Harnesses (8), black 1
53 Harness B Harnesses (8), tri-colored 1
54 Harness C Harnesses (2), red and
white 1
55 Battery snap 1
56 Nutube rubber Rubber, 32 x 16 x 1t 1
57 Circuit board cushion PORON 45 x 14 x 4t 1
Note: The quantities of parts shown on this list are the number of parts
actually used. The kit may contain some extra parts that are not used.

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Mounting Diagram

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Mounting the Circuit Board
Building the main circuit board
Starting from the shorter parts, attach and solder the parts while referring
to the list of mounted parts and the mounting diagram. Be careful not to get
the parts mixed up. The jacks and volume controls are soldered on last.
You might find it easy to work by following the steps below.
Soldering the parts
1. Solder the resistors (21–39).
The position and fixed number of parts will vary, depending on the
variation you decided to build (CLEAN, OVERDRIVE or DISTORTION).
Install the parts according to the model you will be building, while
checking the “List of mounted parts” on page 7.
R19 R20 R21 R22 R23 R24 R16
CLEAN OPEN 0 OPEN OPEN 0 0 10K
OVERDRIVE OPEN 0 OPEN OPEN 0 0 240
DISTORTION 4.7K 15K 0 0 OPEN OPEN 15K
2. Solder the diodes (5, 6).
The diodes have polarities, so make sure to mount them in the right
direction.
Symbol
Part
´s appearance
3. Solder the inductor (40).
4. Solder the operational amplifier socket (3).
Be sure to install the part in the correct direction.
5. Install the operational amplifier (2) in the socket.
Install the pin #1 of the operational amplifier (shown with a mark) so
that it lines up with the dot on the circuit board. Be sure to mount the
part in the correct direction.
6. Solder the J-FET (4).
Be sure to mount the parts in the correct direction.
7. Solder the connectors (41–43).
Be sure to mount the parts in the correct direction.
If the symbols do not match those shown on the circuit board, the
connector is facing the wrong way.
8. Solder the slide switch (46).
9. Solder the trimmer potentiometer (50).
10. Solder the capacitors (7–20).
Mount the parts beginning with the shorter ceramic capacitors, and
then the film capacitor, and finally the electrolytic capacitor.
The electrolytic capacitors have polarities, so make sure to mount
them in the right direction.
The position and fixed number of parts will vary, depending on the
variation you decided to build. Install the parts according to the model
you will be building.
C2 C19 C8 C9B C16
CLEAN 0.1uF OPEN 1uF OPEN OPEN
OVERDRIVE 0.01uF OPEN 0.047uF OPEN 0.22uF
DISTORTION 0.01uF 1uF 0.047uF 0.01uF 0.0082uF

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11. Solder the 3-terminal regulator (1).
Be sure to mount the part in the correct direction.
12. Solder the DC jack (44).
Solder the DC jack carefully so that it is flush with the circuit board
without being slanted.
13. Solder the volume controls (48, 49, 51).
Turn the circuit board upside-down to mount and solder the volume
controls.
Solder the volume controls carefully so that they are flush with the
circuit board without being slanted.
Tip: It may be difficult to solder the volume controls if you have installed
the phone jacks first.
14. Turn the circuit board over once more, and then install the phone
jacks (45).
The spacers on the circuit board are necessary to correctly align the
angles of the jacks and the housing, so do not remove them. Attach the
jacks so that they are flush with the spacer and circuit board.
spacer
Phone jack
circuit board
Upper case

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Building the Nutube circuit board unit
1. Attach the Nutube rubber (56) to the back side of the Nutube, as
shown in the diagram.
When attaching the Nutube rubber, make sure that it does not touch
the sealing lid of the Nutube.
Nutube
Sealing lid
Nutube rubber
2. Solder the Nutube (47) onto the side of the Nutube circuit board with the
screen-printed surface.
After making sure that all of the Nutube pins have been inserted into
the holes on the circuit board, peel off the release paper on the Nutube
rubber. Mount the rubber so that it is flush with the Nutube circuit
board, and then solder.
3. Solder the connectors.
Nutube
connector
4. Attach the circuit board cushion (57) onto the back side of the
Nutube circuit board.
Nutube circuit board
Circuit board cushion
Nutube circuit board
as-built drawing

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1
5
6
7
8 15
16
9
17
18
10
11
13
14
12
2
3
4
1Upper case HAMMOND 1590BB aluminum
2Lower case HAMMOND 1590BB aluminum
3Case screws HAMMOND 1590BB parts included
4Rubber feet Transparent rubber
5Volume knobs Includes set screws
6Volume nuts
7Volume washers
8
LED holder Metal plating
End cap Included with LED holder
LEDs 9008–TN22–A
9Washers Included with LED holder
Nuts Included with LED holder
10 Nutube bottom cushion CR sponge 48 x 22 x 7t
11 Battery (sold separately) 9V alkaline battery (6LF22/6LR61)
12 Battery snap
13 Battery cushion
14 Foot switch 3PDT
15 Jack nut
16 Jack washer
17 Nutube circuit board unit Parts for assembly on page 11
18 Main circuit board
Parts for assembly on pages 9 and 10
Note: The following parts are included but not used in assembly.
-
Parts included with phone jack: Plastic washers (black) (2), fiber washers (2)
- Parts included with foot switch: Internal tooth lock washer (1)
Parts List

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Assembly
1. Attach the battery snap [12].
Wrap the wires through the holes on the circuit board and then solder.
Mounting the battery snap in this way will make it more difficult to pull
and break the wires when exchanging the battery. Run the battery snap
side through the hole so that it goes below the main circuit board.
+（Red wiring）
－ （ Black wiring ）
2. Mount the LED on the upper case [1], and solder the harness (54).
Insert the LED holder [8] into the LED, and snap the end cap on. Attach
the washer and nut from the rear side of the upper case. Solder the
longer LED lead to the red harness wire, and the shorter lead to the
white wire.
Tip: If the end cap is loose and falls off, use adhesive tape or glue to fix it
in place.
3. Attach the foot switch [14] to the upper case [1].
Attach the foot switch so that it is as level as possible with the upper
case, and fix it in place with the washer and nut included with the foot
switch.
4. Mount the main circuit board [18] into the upper case.
Installing the main circuit board into the upper case, attach the jack
washer [16] and temporarily tighten the nut [15].
Attach the washers [7] to the volume controls, and tighten the nuts [6].
Afterwards, tighten the nut [15] of the volume control.
LED Holder
LED
End cap

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5. Mount the Nutube circuit board unit [17].
Peel off the release paper on
the double-sided tape of the
circuit board cushion (57) that
was attached to the Nutube
circuit board unit [17], and
mount the circuit board unit.
The Nutube circuit board
cushion is susceptible to heat,
and will melt if your soldering
iron touches it. Mount the
circuit board after you have
finished all of the soldering
work.
6. Connect the Nutube circuit board and the main circuit board with
harness A (52).
7. Solder harness B (53) to the foot switch [14].
Solder in order, while referring to the wiring
diagram.
8. Connect the foot switch and the main circuit
board with harness B (53).
9. Connect the LED and the main circuit board
with harness C (54).
10. Attach the battery cushion [14] into the
battery space.
foot switch
11. Connect the battery and fit it into the battery space.
Batteries are not included. You will need to purchase a commercially
available 9V alkaline battery (6LF22/6LR61).
12. Close the lower case [2], and secure it with the screws.
After attaching the Nutube bottom cushion [11] onto the inside of the
lower case, close the lower case and secure it with the case screws [3]
in four places.
Take care not to pinch the harness or other parts when closing the
case.
13. Attach the rubber feet [4] onto the lower case.
Attach the rubber feet and rating label onto the lower case.
14. Attach the volume knobs [5].
Mount the volume knobs onto their spindles.

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Operation Check
After you have assembled all of the parts, make sure that no parts are
remaining. Starting from the beginning, follow each step while referring to
the assembly instructions, to make sure that the unit has been properly
assembled.
Before turning on the power, make sure to check the following.
• Are the parts mounted in the correct place?
• Are the parts mounted in the correct direction?
• Did you leave any bridges or other imperfections when soldering?
• Is the power line free from short circuits?
When you have successfully finished assembling the unit, test its operation
while reading “Part Names and Functions” on page 6.
If you have found any problems with assembly or operation, use the
troubleshooting steps below.
Troubleshooting
Some parts are left over.
• The kit may contain some extra parts that are not used, such as resistors
or capacitors.
There aren’t enough parts.
• If you have lost some parts, contact us at www.nutekt.org.
• Also, contact us at www.nutekt.org if any parts were missing or damaged
before you started to assemble the unit.
I can’t assemble the unit, because I broke a part.
• Please contact us at www.nutekt.org.
The unit makes an abnormal sound when I tilted it or shook it after
assembly.
• A loose screw or other part might be left inside the unit. Open the lower
case and check the inside.
The volume controls or jacks are loose.
• Make sure that the nuts are fastened tightly. Remove the knobs from the
volume controls and retighten the nuts.
Adjusting and setting the main circuit board
The trimmer potentiometer on the main circuit board adjusts the Nutube
bias voltage. Normally, adjust this so that it produces maximum volume.
1. Connect a battery or AC adapter
When using batteries to power this unit, connect a cable to the input
jack.
2. Turn the SHAPE knob all the way down.
3. Adjust the trimmer potentiometer on the main circuit board.
Flip the slide switch on the main circuit board to the single side, and
turn the trimmer potentiometer so that the Nutube is the brightest.
Flip the slide switch to the Double side to confirm that the Nutube
lights both ways. Note that the brightness of the Nutube may look
different from left to right.
Tip: The sound quality will change depending on the bias voltage settings.
Adjust the settings according to the sound that you like.
Tip: Flipping the slide switch on the main circuit board to Double will give
you a two-series circuit, adding gain and volume.
Tip: More power will be consumed when the slide switch is set to Double,
which means shorter battery life.