Nutube Evaluation Board II NEB-2
A board that can select 4 levels of Nutube harmonics
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Nutube harmonics can be selected.(4 levels of distortion: approximately [1]:0.015%, [2]: 0.1%, [3]: 0.3%, [4]: 1%)
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Equipped with a switch that allows bypassing the Nutube.(Easy switching between “with” and “without” Nutube.)
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Equipped with an output volume control Nutube VOLUME so it can be used as a Nutube buffer.
![NEBII_main-1024x708.jpg](https://static.wixstatic.com/media/9caa04_568a4f18bd1b46bea29b3f4d3a684d17~mv2.jpg/v1/crop/x_0,y_8,w_1024,h_650/fill/w_855,h_543,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/NEBII_main-1024x708.jpg)
Specifications
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]
Connections 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:12V)
* Made in South Korea
![NEBII_top.png](https://static.wixstatic.com/media/9caa04_04014436ecd54d4994c5edff07fd9e0e~mv2.png/v1/fill/w_113,h_55,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/NEBII_top.png)
![NEBII_sub1.png](https://static.wixstatic.com/media/9caa04_06e601cc99044c46ad4f7d59eb8e959e~mv2.png/v1/fill/w_112,h_68,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/NEBII_sub1.png)
Documents
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User Guide / Circuit Diagram / Parts List(PDF/2.0MB)
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Block Diagram / Reference: Distortion vs. Input Level / Appendix: Adding an input volume control(PDF/373KB)
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Circuit Diagram(PDF/1.7MB)
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Pattern Diagram(PDF/1.6MB)
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Board Size(PDF/32KB)
Modification Example: Additional input volume
![NEB-2_mod.png](https://static.wixstatic.com/media/9caa04_c3c72a70dc3242d2bcf58e808f5af62d~mv2.png/v1/fill/w_84,h_37,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/NEB-2_mod.png)
![NEB-2_改造例回路図_改訂版.jpg](https://static.wixstatic.com/media/9caa04_03a65ac7c36644848e922772abdbaa2d~mv2.jpg/v1/fill/w_136,h_75,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/NEB-2_%E6%94%B9%E9%80%A0%E4%BE%8B%E5%9B%9E%E8%B7%AF%E5%9B%B3_%E6%94%B9%E8%A8%82%E7%89%88.jpg)