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IBASSO AMP13 Tube Amplifier Module Korg Nutube 6P1 for iBasso DX300 / DX320 Blue
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iBasso AMP13
Tube Amplifier Module Korg Nutube 6P1 for iBasso DX300/DX320 Blue
The iBasso AMP13 module was designed to provide an alternative amplification system for the iBasso DX320 and DX300 digital music players, allowing for a different sound signature to suit individual tastes. Here, the AMP13 adopts a Korg Nutube 6P1 tube amplifier stage, providing a smooth and round sound, complemented by a second amplifier section to boost the power of the module.
6th Gen Korg Nutube
Offered by KORG and Noritake, the 6th generation Nutube works exactly like a conventional triode tube and offers the same characteristics including rich harmonics. In addition, the Nutube provides lower power consumption, significant miniaturization and quality improvements over a standard tube.
The iBasso AMP13 completes its voltage amplification via the Nutube, thus providing a round and warm sound while ensuring excellent linearity.
Dual single-ended outputs
The voltage amplification capabilities of the Nutube 6P1 are however limited. Two stages of amplification are necessary to obtain a comfortable power output. So, in order to take advantage of both the sound signature of the tube and a nice reserve of energy, the AMP13 adopts a double 3.5mm jack output with a low noise tube output and a second one offering more power.
Low noise tube output:
The AMP13 uses a Nutube 6P1 voltage amplifier. This is followed by a digital volume control and a current amplifier. This low noise tube output comes directly after the first stage of amplification. It allows to take advantage in a more important way of the sound signature offered by a tube amplification and has an excellent noise control (2.5Vrms).
Maximized output:
This second output first goes through the Nutube amplifier stage and is followed by a second level of amplification. It allows the AMP13 to take advantage of a greater voltage and current amplification, allowing to accompany most headphones (4.1Vrms).
Three channels of amplification
The single-ended output of conventional players usually has only two-channel amplification. Here, to enhance the performance of the Nutube 6P1, the AMP13 uses three-channel amplification. An OPA1622 PDO amplifies the output ground signal, allowing for a significant reduction in background noise while improving the dynamics and capabilities of the tube amplification.
Dedicated battery & Dual DC-DC power supply
The DX320/DX300's amplifier section has its own battery power supply, which is perfectly suited to power the AMP13 module. The AMP13 uses two high-performance DC-DC chips from Linear Technology, for a total of four DC-DC power supplies. The first one offers a voltage of 1.8V for the cathode, via a low noise LDO, the second one provides 21V for the anode of the Nutube, and the last two have a voltage of +8V and -8V, constituting the 16V voltage oscillation feeding the AOP.
Optimized architecture
- Toshiba 2SK209 field effect transistor for the Nutube output buffer.
- Separate signal and shield grounds to avoid noise that may be caused by interference.
- Negative feedback to the amplifier circuit to effectively reduce distortion and allow a wider frequency response.
- By adding a dedicated JRC ultra-low noise volume control, background noise is reduced at low volumes and transparency is improved.
Tested and adjusted by hand
Each AMP13 unit is tested and optimized using an AP audio analyzer. Three multi-turn potentiometers on the board are calibrated and matched by engineers to provide optimal performance. As a result, the AMP13 delivers clear high frequencies and an overall smooth, balanced sound.
When wifi is used with this tube amplifier, the sound reproduction can be disturbed.
Technical characteristics
| Specifications | |
|---|---|
| Product type | Amplifier |
| Amplification type | Tubes |
| Tubes | Korg Nutube 6P1 |
| Outputs | 2x Jack 3.5mm |
| Output buffer | Toshiba 2SK209 field effect transistors |
| Compatibility | DX320 DX300 |
| General | |
|---|---|
| Color | Blue |
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