6th-gen Korg Nutube
A triode tube stage for rich overtones and smooth sound.
IBASSOAMPLIFIER CARDCustomer reviews (0)
iBasso AMP14 Amplifier Card
Nutube warmth for your DX300 or DX320.
A hand-tested Nutube amp card for the iBasso DX300 and DX320, with 4.4mm balanced PO and LO outputs.
Regular price
£249.00
Unit price
Including VAT
Free next day UK delivery
Awaiting stock arrival date — order now to reserve one from the next delivery. Nothing to pay until it arrives.
THE AMP3 DIFFERENCE
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iBasso AMP14 Amplifier Card
A little extra. A better pairing.
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MEET THE AMP14
Nutube warmth for your DX300 or DX320.
A hand-tested Nutube amp card for the iBasso DX300 and DX320, with 4.4mm balanced PO and LO outputs.
Optimised circuit
A Toshiba JFET buffer, separate grounds and a low-noise volume controller.
Hand calibrated
Each module is tested and calibrated at the factory.
Read the full description
The iBasso AMP14 is a plug-in amplifier card that brings the sound of a sixth-generation Korg Nutube to iBasso’s DX300 and DX320 players, with two Pentaconn 4.4mm balanced outputs: a headphone output at up to 5.2Vrms and a line output at 1.8Vrms. Each card is hand-tested and calibrated at the factory.
A sixth-generation Korg Nutube
Made by Korg and Noritake, the Nutube works exactly like a conventional triode vacuum tube, with the same rich overtones sought after in triodes, while using far less power and space. In the AMP14 it handles voltage amplification, for an engaging, unique tube sound with excellent linearity.
Fully balanced 4.4mm outputs
After the Nutube 6P1 voltage amplifier, a JFET differential converter creates the L−, L+, R+ and R− signals. Two JRC volume chips form a four-channel, truly balanced volume control, and a four-channel balanced buffer drives the outputs. Pentaconn 4.4mm sockets give excellent sound quality and durability.
Cathode input
The AMP14 feeds the signal to the Nutube’s cathode, whose impedance is lower than the grid’s, reducing interference from outside sources for an excellent noise floor, low Wi-Fi interference when streaming, and well-controlled tube microphonics.
Clean power from the player
The amp section of the DX300 and DX320 has its own battery, ideal for a card with strict power requirements. Two Linear Technology DC-DC chips provide four supplies: 3.6V for the cathode through a low-noise LDO, 14V for the Nutube’s anode, and +8V and −8V for a 16V swing for the op-amps.
Advanced circuit design
- A Toshiba 2SK209 field-effect transistor, inherited from the AMP9, buffers the Nutube’s output.
- Signal ground and shield ground are separated to prevent noise interference.
- Carefully set negative feedback reduces distortion and extends the bandwidth.
- A dedicated JRC ultra-low-noise volume control lowers the noise floor at low volume and in quiet passages.
Hand matched
Every AMP14 is tested and matched on an Audio Precision analyser, with three multi-turn potentiometers on the board calibrated by hand for the Nutube’s best performance, for a clean, extended treble and a sweet, engaging sound.
| Tube | Korg Nutube 6P1 (6th generation), cathode input · Toshiba 2SK209 buffer |
|---|---|
| Outputs | 4.4mm balanced headphone (5.2Vrms) · 4.4mm balanced line out (1.8Vrms) · Pentaconn sockets |
| Circuit | JFET differential converter · 2 × JRC volume (4-channel balanced) · 4-channel balanced buffer |
| Power | From the player’s amp battery · 4 DC-DC supplies (3.6V, 14V, ±8V) |
| Compatibility | iBasso DX300 and DX320 |
Good to know
- Update the player’s firmware to the latest version before fitting the AMP14.
- When streaming, iBasso notes that subtle Wi-Fi interference may be heard while data buffers; it is almost inaudible at normal volumes and depends on your earphones’ sensitivity.
- There is no 3.5mm output on this card; for two 3.5mm Nutube outputs see the iBasso AMP13.
In the box
- iBasso AMP14 Amplifier Card
THE FINER DETAILS
Built for
better listening.
Know what you’re choosing.
Find the right fit for your setup.
- Design
- Replaceable amp card for iBasso DX300/DX320
- Headphone outputs
- 4.4mm balanced
- Output power
- 4.4mm balanced PO 5.2Vrms · 4.4mm balanced LO 1.8Vrms
- Compatibility
- iBasso DX300 and DX320
- Amplification
- 6th-gen Korg Nutube with Toshiba 2SK209 buffer
- Line outputs
- 4.4mm balanced
- Finishes
- BLACK
Specifications are based on manufacturer information and may change.
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How does free delivery work?
Every UK order has a free delivery option, and orders of £50 or more qualify for free next day delivery. Order by 12 noon, Monday to Friday, for next day delivery; orders placed after 12 noon, at the weekend or on a bank holiday are dispatched on the next working day. Stock availability and destination also affect arrival — check the options shown at checkout.
Pre-orders ship when stock arrives; the next day service starts after dispatch. Full delivery information
What if it’s not right for me?
Return within 14 days for any reason, or within 30 days if faulty, with free return postage. See our full Returns Policy for conditions and how to start a return.
Can you help me choose headphones?
Absolutely. Tell us what you listen to and the headphones you have — or the ones you’re considering — and we’ll help you find a suitable pairing. Chat with us
How do I request a Price Beat?
Use the Price Beat option on this page to send us the competing offer. The team will review your request; it isn’t an automatic discount. How Price Beat works
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