Provided by KORG and Noritake, the 6th GEN Nutube operates exactly as a conventional triode vacuum tube and creates the same characteristic rich overtones that are sought after in triode tubes. At the same time, the Nutube achieve substantial power saving, miniaturization, and quality improvements when compared with a conventional vacuum tube.
The AMP13 competes voltage amplification through the vacuum Nutube, while giving AMP13 An Engaging, Unique Vacuum Tube Sound, delivering excellent linearity.
Low Noise Tube Output + Maximized Output Unique Dual Single Ended Outputs
The voltage amplification capability of the Nutube 6P1 is limited. Two stages of amplification are necessary to obtain higher output power. To have both a stronger tube signature and a higher output power, the AMP13 adopts a dual 3.5mm single-ended output design with low noise tube output and maximized output at the same time.
The AMP13 utilizes Nutube 6P1 as a voltage amplifier. This is followed by a digital volume control and current amplification. The low noise tube output is the output after the first stage of amplification. Although the output is not high using this design, the Nutube has a stronger tube sound signature and noise control is excellent. (2.5Vrms)
The output passes through a first stage Nutube amplifier, followed by a secondary amplification. With this, the AMP13 has a higher voltage and current output capability, that is, a better driving capability for headphones and IEMs. (4.1Vrms)
The single-ended output of ordinary players general only has left and right dual channel amplification.
Although the Nutube 6P1 has the same characteristic rich overtones as conventional triode vacuum tubes, its low output capability and poorer noise control have always been a design problem. On the AMP13, iBasso uses three-channel amplification. Utilizing the OPA1622to amplify the output ground signal, the noise floor is dropped substantially, while enhancing dynamics and Improving the Nutube performance.
The AMP section of the DX320/DX300 has its own battery power, which is perfect for the AMP13 utilizes two pieces of high performance DC-DC chips from Linear Technology, with a total of 4 DC-DC power supplies. One DC-DC is 1.8V for the cathode through a low-nose LDO, and one is 21V for the anode of Nutube, one is +8V and one is -8V, which constitutes the 16V voltage swing that feeds the OPAMPS.
Inherited from AMP9, adopting Toshiba 2SK209 field effect transistor as the Nutube signal output buffer.
Signal grounding and shield grounding separated to prevent noise interference.
Appropriate negative feedback to the amplifier circuit effectively reduces distortion extends the frequency bandwidth.
By adding a dedicated JRC ultra JRC ultra-low noise volume control, the noise floor is reduced when using low volume or during quieter parts of the music. Transparency is also enhanced.
Each AMP13 is tested and matched with an AP audio analyzer, with 3 multi-turn potentiometers on the AMP13 board, which are manually calibrated and matched by engineers to present the optimal performance of the Nutube.
The AMP13 brings a clean extended upper frequency and a sweet and engaging sound together for your musical enjoyment.
AMP13 is compatible with the DX320/DX300. Please update the firmware to the latest version to have an optimized support of the AMP13.