iBasso AMP9 Nutube Vacuum Tubes 3.5mm Headphone AMP Card for DX220/DX150/DX200. An engaging, unique vacuum tube sound, delivering excellent linearity
Based on the sixth generation of Nutube vacuum tubes made by Korg and noritake, AMP9 completes voltage amplification through Nutube vacuum tubes, giving AMP9 an engaging and unique tube sound. On the buffer stage, buffers of up to a ±200mA linear current output are utilized. The AMP9 has a high current drive capability for low impedance monitors and headphones, while giving a unique quality of tubes.
Advanced Circuit Design
1. The Nutube is powered by a dedicated high-performance DC-DC chip provided by linear technology. The chip contains two DC-DC circuits, one is 1 Volt for the cathode, and one for the ultra-high voltage for the tube anode.
2. Signal grounding and shield grounding are separated to prevent noise interference.
3. Added appropriate negative feedback to the amplifier circuit effectively reduces distortion and extends the frequency bandwidth.
4. A dedicated volume control has also been added, which lowers the noise floor for low volume.
The Better Parts, the Better the Sound
AMP9 uses many high precision Susumu metal film resistors, custom gold-plated inductors, ROHM polymer tantalum capacitors and Panasonic polymer tantalum capacitors to effectively reduce power supply resistance and improve dynamic performance and resolution.
A custom-made silicone shock absorber for the Nutube module, effectively reduces the microphonic effect.
Hand Matched, Every One is a Masterpiece
Each AMP9 is tested and matched with the AP audio analyzer, with 3 multi-turn potentiometers. The three potentiometers are manually calibrated and matched by engineers for the optimal performance of the Nutube.
After 20 versions of development boards optimization and tuning, AMP9 brings a bright, sweet, and engaging sound, which is then brought to its full potential by our players.
AMP9 is Compatible with the DX150/DX200/DX220
Please update the firmware to the latest one to have an optimized support of the AMP9. And above all, please enjoy the music!
Output port: 3.5mm single ended