Korg Nutube NEB-2 User manual

NEB-2 User Guide
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Nutube Evaluation Board II
A board that can select 4 levels of Nutube harmonics
Nutubeの倍音を4段階切替えができる評価ボード
最大入力  ＋2[dBu]  *ただしBIAS電圧6V調整時（BIAS調整参照）
最大出力  ＋12[dBu]  *ただしBIAS電圧6V調整時（BIAS調整参照）
最大増幅率  ＋10[dB]  *ただしBIAS電圧6V調整時（BIAS調整参照）
周波数特性  20[Hz]~40k[Hz]
SN比   100[dB]  *NutubeBIASの設定で変動
入力   RCAｘ2   *入力インピーダンス10k[Ω]
出力   RCAｘ2   *出力インピーダンス50k[Ω]未満
コントロール  NutubeVOLUMEx1
   4TypesToneSelectスイッチx2(左/右)
   Nutube-BYPASS出力切替スイッチx1
   BIAS調整用半固定VOLUMEx2(左/右)
電源   DC12VACアダプター （KA251）、または外部電源供給端子(+7V~+20V,推奨:12V)
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Features
1. Nutube harmonics can be selected.
(4 levels of distortion: approximately [1]:0.015%, [2]: 0,01%, [3]: 0.3%, [4]: 1%)
2. Equipped with a switch that allows bypassing the Nutube.
(Easy switching between “with” and “without” Nutube.)
3. Equipped with an output volume control Nutube VOLUME so it can be used as a Nutube buffer.
注意事項
本評価ボードは、Nutube6P1を評価するためのボードです。
この評価ボードを他の目的に使用することは固くお断りします。
コルグは、すべてのサンプルが全く同じように動作することを保証するものではありません。
Max Input Level +2 [dBu] Measured at 6V BIAS voltage *It varies depending on the Nutube BIAS setting.
Max Output Level +12 [dBu] Measured at 6V BIAS voltage *It varies depending on the Nutube BIAS setting.
Max GAIN +10 [dB] Measured at 6V BIAS voltage *It varies depending on the Nutube BIAS setting.
Frequency response 20 [Hz]~40k [Hz]
SN ratio 100 [dB] *It varies depending on the Nutube BIAS setting.
Connections Input RCA x 2 *Input Impedance 10k [Ω]
Output RCA x 2 *Output Impedance Less than 50k [Ω]
Controls Nutube VOLUME x 1
4 Types Tone Select SW x 1 (LEFT / RIGHT)
[Nutube – BYPASS]SW x 1
BIAS ADJ x 2 (LEFT / RIGHT)
Power Supply DC12V AC adapter or External power supply (+7V ~ +20V, Recommend:12
V )
Specifications
仕様
特徴
1.Nutubeの倍音の切り替えが可能。（4段階、ひずみ率・約[1]:0.015%,[2]:0,01%,[3]:0.3%,[4]:1%)
2.NutubeをBYPASSできるスイッチを搭載。（Nutubeの有り/無しを簡単に切り替え可能）
3.出力ボリューム（NutubeVOLUME）搭載。真空管バッファのような使い方も可能。
CAUTION
ENGINEERING EVALUATION PURPOSES ONLY
This evaluation board is made for the purpose of the Nutube evaluation.
It is strictly prohibited to use this evaluation board for any other purpose.
KORG does not guarantee that all samples will perform in exactly the same way.

NEB-2 User Guide
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1. Connect the audio signal as shown in the figure above.
2. Connect the 12V AC adapter or a stabilized DC power supply, and turn on the POWER SW. (Nutube glows blue)
3. Set the [Nutube - BYPASS] SW to the “Nutube” side.
4. Set the 4 Types Tone Select switch to 4 (the most harmonics)
5. Adjust the volume of the device connected to the input to an appropriate value.
(Set it to just below the level that gets distorted).
6. While switching the Nutube-BYPASS switch back and forth, adjust the Nutube VOLUME so that the volume is the same
in both positions.
7. Take advantage of the 4 Types Tone Select SW and enjoy the difference in tone due to harmonics.
1.上記の図のように接続してください。
2.AC（12V）アダプターまたは外部電源を接続し、POWERSWをONしてください。（Nutubeが青く光ります）
3.出力側の[Nutube-BYPASS]SWをNutube側にしてください。
4.倍音切り替えスイッチ（4TypesToneSelectSW）を4に設定してください。（倍音が一番多い状態にします）
5.入力の接続機器の音量を適正な値に調整してください。（歪む直前の値に調整する事をお勧めします）
6.［BYPASS］と［Nutube］の音量が同じレベルになるように、[Nutube-BYPASS]SWの切り替えを繰り返して音量を比較しながら
NutubeVOLUMEを調整します。
7.倍音切替えスイッチ［4TypesToneSelectSW］を4段階切り替えて、倍音による音色の違いをお楽しみください。
Set the 4 type Tone Selector switches to MODE 1.
Connect an oscilloscope or voltmeter to pin 7 of IC2 (left) or IC3 (right). Turn BIAS ADJ LEFT or RIGHT to adjust the
voltage to 6V.
4TypesToneSelectSWをMODE1にします。
IC2（または3）の７番ピンにオシロスコープもしくはテスターを接続しBIASADJLEFT(またはRIGHT)を回して７番ピンの電圧を
6Vに調整します。
How to adjust the Nutube Bias *The bias is pre-adjusted to ＋5V〜＋7V at the time of shipment.
NutubeBias調整法*出荷時にBIASは＋5V〜＋7Vに調整済みとなっています。
V+GND
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Stabilized
DC power supply
7~20V( Recommend12 V)
AC Adapter
DC12V
MAX INPUT LEVEL +2dBu
Audio player
Powered monitor speaker
or audio system
Use one of them to supply power
2.1mm I.D. - 5.5mm O.D.
Introduction
はじめに
Connection Example
接続例

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©2022KORGINC.
KORGINC.
4015-2Yanokuchi,Inagi-city,Tokyo206-0812Japan korgnutube.com
PARTS LIST
No. Designator Category Part Name / Specification Qty
1 TU1 Nutube(vacuum tube) 6P1 1
2 IC2,IC3 Operational amplifier SO8412P-TH-WS 2
3 RE1 Voltage regulator NJM78L03SU3 1
4 D1,D2 SBD SS14 2
5 C5,C15,C18,C20,C22,C24,C43 Chip ceramic capacitor MLCC 2012 X7R 0.1uF 25V 7
6 C29,C30 Chip ceramic capacitor MLCC 1608 X7R 100pF 25V 2
7 C3,C4,C9,C11 Electrolytic capacitor 1uF / 50V 4
8 C1,C2,C8,C12 Electrolytic capacitor 10uF/16V 4
9 C14,C16 Electrolytic capacitor 470uF/25V 2
10 C10,C13 Electrolytic capacitor 330uF/25V 2
11 C7,C17 Electrolytic capacitor E-CAP 10uF 50V 2
12 C19,C21,C23 Electrolytic capacitor E-CAP 100uF 35V 3
13 C6 Electrolytic capacitor E-CAP 220uF/25V 1
14 C44 Electrolytic capacitor E-CAP 47uF/ 6.3V 1
15
R8,R10,R41-R44,R47,R49,R51-R54,C25,C26 Chip resistor Chip CFR 1603 0 Ohm 14
16 R15,R20 Chip resistor Chip CFR 1603 1.3 KOhm 1
17 R9,R11,R16,R23 Chip resistor Chip CFR 1603 100 KOhm 4
18 R25,R33 Chip resistor Chip CFR 1603 150 KOhm 2
19 R26,R34 Chip resistor Chip CFR 1603 18 KOhm 2
20 R27,R35 Chip resistor Chip CFR 1603 1 KOhm 2
21 R38,R39 Chip resistor Chip CFR 1603 330 KOhm 4
22 R13,R18,R45,R46 Chip resistor Chip CFR 1603 20 KOhm 4
23 R21,R30 Chip resistor Chip CFR 1603 33 KOhm 2
24 R22,R31 Chip resistor Chip CFR 1603 39 KOhm 2
25 R3,R6 Chip resistor Chip CFR 1603 15 KOhm 2
26 R14,R19 Chip resistor Chip CFR 1603 6.2 K KOhm 2
27 R12,R17,R24,R32 Chip resistor Chip CFR 1603 56 KOhm 4
28 R7 Chip resistor Chip CFR 1603 68 Ohm 1
29 R2,R5,R28,R29,R36,R37 Chip resistor Chip CFR 2012 10 KOhm 6
30 R40 Chip resistor Chip CFR 2512 10 Ohm 1
31 INPUT, OUTPUT Volume V9MG-2R B100K 2
32 TR1,TR2 Trimmer Potentiometer CET065P-B10K 2
33 DC_IN DC JACK JK102 C-2mm 1
34 RIGHT_IN,RIGHT_OUT RCA JACK RCA-105A RED 2
35 LEFT_IN,LEFT_OUT RCA JACK RCA-105A WHT 2
36 SW1,SW2 Rotary Switch 3P4T 0.5A 125VAC 2
37 BYPASS-Nutube SLIDE Switch DPDT VERTICAL 1
38 POWER Push Swirch JRS-2254A 1
39 J1 Connector 1.25p H 6P 1
40 J2 Connector 1.25p V 6P 1
41 Screw M3×P0.5 L=6 4
42 Spacer M3×20 hex Ni 4