2019
Table of Contents
OD-S
NUTUBE OVERDRIVE KIT
EJ 1
Main features .............................................................2
Cautions Before Assembly.......................................5
Tools to prepare ......................................................................5
Checking the parts .................................................................5
Assembly Parts List .................................................6
Assembly ...................................................................7
Adjusting and setting the main circuit board ...................9
Operation Check ........................................................9
Troubleshooting ......................................................................9
Part Names and Functions .................................... 10
Specifications .......................................................... 10
Recommended Settings........................................... 11
Normal OVERDRIVE .............................................................. 11
Tube OVERDRIVE ................................................................... 11
Hard Drive ................................................................................ 11
Mounting Diagram ....................................................13
List of mounted parts ............................................. 14
CIRCUIT DIAGRAM ................................................. 16
- 1 -
Thank you for purchasing the Nu:Tekt OD-S NUTUBE OVERDRIVE KIT.
To help you get the most out of your new instrument, please read this
manual carefully.
Main features
• The Nu:Tekt OD-S is a kit used to assemble effectors that use the Nutube.
• Use the Nutube on the OD-S to get an authentic tube overdrive sound.
• This kit includes a TUBE GAIN knob, which allows you to easily change
the distortion waveform.
• Use the internal dipswitch to switch between a full-range overdrive with a
full low end and a sparkling high end, and a midrange overdrive sound
with plenty of bite, on which the low and high end frequencies are cut off
at just the right amount.
• 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 (nutekt.org), 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.
-
- 2 -
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 purchased.
If this symbol is shown on the product, manual, battery, or package, you
Notice regarding disposal (EU only)
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.
-
- 3 -
- 4 -
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 and instrument cables. These items are
not included, so please obtain them separately.
• 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)
Checking the parts
Before assembly, make sure that all parts are on hand.
Contact us at nutekt.org if any parts are missing or damaged.
- 5 -
5
Assembly Parts List
6
7
21
1
20
22
19
10
2
8
9
3
4
18
17
14
16
15
14
13
12
11
1 Upper case Aluminum 1
2 Lower case Aluminum 1
3 Case screws Flat head screw, M3 x 12 4
4 Rubber feet Polyurethane 12.7 x 3.6 4
5 Volume knobs Includes set screws 4
6 Volume nuts M7, wide 10mm 4
7 Volume washers 7.2 x 12 4
8 LED holder -- 1
Washer Included with LED holder 1
9
Nut Included with LED holder 1
10 Nutube bottom cushion Sponge 48 x 22 x 7 1
11 Battery (sold separately) 9V alkaline battery (6LF22/6LR61) --
12 Battery cushion Sponge 90 x 54 x 2 1
13 Foot switch unit LED 1
14 Nut M12, wide 14mm 2
15 Internal tooth lock washer 12.8 x 16 x 0.5 1
16 Washer 12.3 x 16 x 0.5 1
17 Jack nut Wide 11mm 2
18 Jack washer 10 x 15 x 0.3 2
19 Nutube circuit board unit -- 1
20 Main circuit board -- 1
21
Harness A
22
Circuit board cushion
23 Rating label
Tip: Affix the rating label onto the bottom of the case or similar location.
Note: The following parts are included but not used in assembly.
Parts included with phone jack: Plastic washers (2), fiber washers (2)
-
Harnesses (8) 1
Sponge 45 x 14 x 4 1
--
1
- 6 -
Assembly
positioning tab
Should not be loose
Circuit board cushion
[14]
Nutube circuit board
as-built drawing
1. Mount the LED holder [8] onto the upper case [1].
Attach the LED holder [8], and then use the
washer and nut to mount the LED holder in
place from the back side of the upper case.
4. Attach the washer [7] onto the volume control, and then tighten
the nut [6].
After you have finished tightening the
volume control nut, retighten the jack nuts
[17] that you temporarily tightened.
2. Install the main circuit board [20] onto the
upper case.
Run the battery snap wires under the main
circuit board, making sure that the knot does
not loosen.
If the knot is loose, the battery snap will not
be able to reach the battery terminals .
3. Attach the washers [18] for the jack, and
temporarily tighten the nuts [17].
Make sure that the positioning tab on the
volume control of the main circuit board
fits perfectly into the notch on the upper
case, and then tighten the nut while
holding the jack.
Be careful not to tighten the nut too hard, so as not to damage the
threads on the jack.
5. Attach the foot switch unit [13] to the upper case [1].
After tightening the nuts [14] on
the foot switch unit [13], attach
the internal tooth lock washer
[15].
Mount the foot switch unit so that
its LED fits right into the LED
holder mounted on the upper
case, and then tighten the foot
switch unit using the washer [16]
and nuts [14].
6. Attach the circuit board cushion [22] onto the back side of the
Nutube circuit board [19].
Nutube circuit board
7. Connect the Nutube circuit board [19] and the main circuit board
with harness A [21].
[14]
- 7 -
[15]
[16]
8. Mount the Nutube circuit board unit [19].
Notch on shaft faces flat on its sideIndicator faces up
9. Peel off the release paper on
the double-sided tape of the
circuit board cushion [22] that
was attached to the Nutube
circuit board unit [19], and
mount the circuit board unit.
13. Adjust the main circuit board.
The board comes preadjusted at the factory, but you can adjust it to
your liking by referring to the instructions on “Adjusting and setting
the main circuit board,” page 9.
14. 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.
10. Connect the harness of the foot switch unit [13] to the main circuit
board.
11. Attach the battery cushion [12] into the battery space.
12. Connect the battery [11] and fit it into the battery space.
Batteries are not included. You will need to purchase a commercially
available 9V alkaline battery (6LF22/6LR61).
15. Attach the rubber feet [4] onto the lower case.
Attach the rubber feet [4] onto the lower
case as shown in the diagram.
16. Attach the volume knobs [5].
Mount the volume knobs onto their spindles.
Tip: The diagram below shows an easy way to position the volume knob
when installing.
- 8 -
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.
Tip Plugging the cable into the INPUT jack will power the unit.
2. Turn the TUBE GAIN knob up to maximum (all the way to the
right).
Set all other knobs to their center positions. Turn the EFFECT switch
on.
3. Adjust the trimmer potentiometer on the main circuit board.
Turn the fixed resistor and adjust so
that it reaches the maximum volume.
The brightness of the Nutube may look
different from left to right. This is not a
defect.
Tip: The sound quality will change
depending on the bias voltage
settings. Adjust the settings according
to the sound that you like.
4. Set the WIDE switch.
Turn the WIDE switch ON for full-range
booster settings. When using the OD-S
along with guitar amp distortion, turn
the WIDE switch OFF for a more cutting sound. Choose the setting that
you like.
WIDEswitch
Trimmer
potentiometer
Operation Check
When you have successfully finished assembling the unit, test its operation
while reading “Part Names and Functions” on page 10.
If you have found any problems with assembly or operation, use the
troubleshooting steps below.
Troubleshooting
There aren’t enough parts.
• If you have lost some parts, contact us at nutekt.org.
• Also, contact us at 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 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.
- 9 -
Part Names and Functions
OUTPUT INPUTDC9V
2
4
3
5
6
1
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. TUBE GAIN knob: By changing the anode resistance value of the
Nutube, the distortion waveform will change, letting you enjoy harmonic
and distortion changes.
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. 10 hr. (Using an alkaline battery)
• Current consumption: 46 mA
• Dimensions (W x D x H): 122 x 96 x 55 mm /4.80" x 3.78" x 2.17"
• Weight: 340 g / 12 oz. (without batteries)
• Included items: Owner’s Manual
• Accessories (sold separately): AC adapter (DC 9V
* Specifications and appearance are subject to change without notice
for improvement.
)
)
- 10 -
Recommended Settings
WIDE
ON
OFF
WIDE
ON
OFF
WIDE
ON
OFF
Normal OVERDRIVE
Tube OVERDRIVE
Hard Drive
This is a typical overdrive setting.
If you want more of a vacuum tube sound (a milder sound), turn the TUBE GAIN knob to maximum, and
adjust the distortion using the GAIN knob.
If you want a harder sound, turn the GAIN knob to maximum, and adjust the distortion using the TUBE GAIN
knob.
This is a full-range overdrive effect that emphasizes the tube sound.
Turn the WIDE switch on the circuit board ON, and adjust the distortion using the GAIN knob.
This is a sound with hard distortion.
If your amp is already distorted, turn the GAIN knob lower than the figure.
- 11 -
- 12 -
Mounting Diagram
- 13 -
List of mounted parts
Part
number
Circuit
number
Part
name
Rating
Quantity
Part
number
Circuit
number
Part
name
Rating
Quantity
1
U3 3-terminal regulator
2
U1 Operational amplifier
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Operational amplifier
U1S
socket
Q1, Q2 J-FET
D1 Schottky barrier diode
ZD1 Zener diode
C2 Film capacitor 0.01μF
C6, C9A Film capacitor 0.1 μF
C4, C11,
C15A,
Film capacitor 1μF
C22
C8A,
Film capacitor 0.047μF
C15B
C5 Ceramic capacitor 0.01μF 1
C14, C17,
Ceramic capacitor 0.1μF 4
C20, C21
C10, C25 Ceramic capacitor 0.1μF 1
C24 Electrolytic capacitor 47μF/16V over 1
C1, C12,
Electrolytic capacitor 100μF/16V over 4
C23
C18 Electrolytic capacitor 220μF/10V over 2
C3, C13 Electrolytic capacitor 330μF/25V over 2
LP2950-33LPRE3 1
TL072IP 1
6pin Socket 1
2SK303L-V3-T92-K 2
1S30(R-1) 1
GDZJ4.7C 1
1
1
4
1
- 14 -
18
L1, L2 Inductor WBRH-3.5x5x0.8-U3.7x10 2
19
R20 Resistor 0Ω 1
20
R2 Resistor 10Ω 1
21
R3 Resistor 100Ω 1
22
R18 Resistor 1kΩ 1
R4, R5,
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
Resistor 10kΩ 4
R6, R16
R14 Resistor 100kΩ 1
R11
Resistor 150kΩ 3
R26 Resistor 220kΩ 2
R17 Resistor 75Ω 2
R1, R7 Resistor 2MΩ 2
R15, R27 Resistor 2.4kΩ 2
R13, R25 Resistor 33kΩ 2
R10A Resistor 4.7kΩ 1
R9 Resistor 51kΩ 1
R12 Resistor 6.8kΩ 1
CN7B Board-in harness 6 1
CN7A Connectors
CN1, CN2 Connectors
CON1 DC jack LD-0202AH-2.0-03A 1
J1, J2 Phone jack
SW2 Dip switch IS-2235-G 1
B6B－PH－K－S
B8B－ZR－3． 4
LJB0664－6
1
2
2
Part
number
40
41
42
43
44
45
Note: An electrolytic capacitor with a higher rated voltage than the voltage
Circuit
number
V1 Nutube (vacuum tube) Nutube 6P1 1
VR1, VR5 Volume control 10K A 2
VR2 Volume control 100K A 1
VR3
Trimmer Potentiometer
VR4 Volume control 500K B 1
Battery snap
CN4
specified may have been used.
Part
name
Rating
10K B 1
-- 1
Quantity
- 15 -
CIRCUIT DIAGRAM
GND
GND
]
47uF/16V
[
CN4
9V Battery ]
LD-0202A-2.0
J1
LJB0664-6
2
1
CN02
CON1
[ INPUT ]
2
3
1
V1
10
7
14
4
912168
6P1
17
1234567
8
CN1
[ WIDE ]
B8B-ZR-3.4
C6
12345
12345
3
SW2B
4
[ ON ]
5
C5
6
MS-22D10
82PF B
R11
150K
C10
100PF B
U1B
6
C11
7
5
+
1uF FILM
NJM072D
R9
51K
BIASGND
6
6
SW1C
SW1B
5
8
4
6
7
FK3L
FK3L
U3
LP2950L-3.3V
1
2
IN
OUT
C14
GND
0.1uF
3
[ OFF ]
+3.3V
VR3
10K B
CW
1 3
R12
6.8K
GND
333-2SURD-S530-A3
LED1
9
+3.3V
C17
0.1uF
CN2
B8B-ZR-3.4
8
R13
33K
2
C12
100uF/16V
C24
[ LOW ][ GAIN ]
C8B
R10B
OPEN
OPEN
C8A
R10A
4.7K
0.047uF FILM
R20
GND
0
U1A
2
C4
-
C2
BL01RN1A2A2B
T
TS
R
RS
S
SS
D1
1S3
C20
0.1uF
R6
10K
R1
0.01uF FILM
2M
L1
GND
ZD1
R18
1K
GDZJ4.7C
R2
10
BIAS
R3
100
R4
10K
R5
C3
10K
330uF/25V
1
3
+
1uF FILM
R7
NJM072D
2M
C25
100PF B
VR1B
7
8
10K A
GND
GND
VCC
( 4.5V ) ( 9V )
U1C
NJM072D
C21
0.1uF
4 8
C1
100uF/16V
CW
1 3
[ GAIN ]
B6B-PH-K-S
06P-SJN
VR1A
2
10K A
C13
330uF/25V
0.1uF FILM
CN7A
CN7B
SW1A
2
1
FK3L
0.7V
VCC
( 9V )
[ TUBE GAIN ]
R14
100K
VR4B
7
8
VR4A
1234567
R26
220K
R25
33K
500K B
2
GND
GND
CW
500K B
1 3
Q1
2SK303L
VCC
( 9V )
Q2
2SK303L
GND
R27
2.4K
GND
+3.3V
R17
75
C18
220uF/10V
L2
BL01RN1A2A2B
R15
2.4K
C22
1uF FILM
C15A
1uF FILM
C15B
0.047uF FILM
[ TONE ]
[ TONE ][ BIAS ]
[ WIDE ]
SW2A
1
3
MS-22D10
C9B
OPEN
VR2A
2
10K A
2
GND
C9A
0.1uF FILM
13
CW
[ ON ]
[ OFF ]
R16
10K
[ VOLUME ]
VR5B
7
10K A
GND
VR2B
7 8
100K A
GND
[ OUTPUT
VR5A
2
CW
100K A
1 3
8
GND
GND
J2
T
TS
R
RS
S
SS
LJB0664-6
GND
- 16 -
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