Nutube 6P1
A warm, relaxed tube sound with a 30,000-hour lifespan.
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iBasso AMP19 Nutube + Super Class A Amplifier Card for DX340
Nutube or Class A for DX340.
An amplifier card for the iBasso DX340 with a KORG Nutube 6P1 tube mode and a Super Class A mode, up to 2,150mW + 2,150mW.
Regular price
£259.99
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.
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iBasso AMP19 Nutube + Super Class A Amplifier Card for DX340
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MEET THE AMP19
Nutube or Class A for DX340.
An amplifier card for the iBasso DX340 with a KORG Nutube 6P1 tube mode and a Super Class A mode, up to 2,150mW + 2,150mW.
Super Class A
A fully discrete mode for power and density.
Up to 2,150mW
Per channel at 32Ω, with JRC analogue volume control.
Read the full description
The iBasso AMP19 is an interchangeable amplifier card for the iBasso DX340 with two very different amplifiers in one compact module: a KORG Nutube 6P1 tube mode for a rich, relaxed sound, and iBasso’s fully discrete Super Class A mode for power and density. With the DX340 on 12V DC it delivers up to 2,150mW per channel into 32Ω, enough for demanding full-size headphones.
Nutube 6P1
The sixth-generation Nutube 6P1 triode, developed jointly by KORG and Noritake, brings the character of traditional tubes to a portable player: warm and natural, with engaging vocals, softer textures and an analogue feel. It is far smaller and more efficient than a conventional tube, about 30% of the size and 2% of the power, and lasts more than 30,000 hours.
Two output modes
- Tube mode: the Nutube 6P1 works as the pre-amp tube, adding harmonic richness for a warmer, more relaxed and natural presentation, with softer textures to vocals and instruments.
- Super Class A mode: 20 dual transistors form a fully discrete amplifier capable of up to 2A, for powerful energy and dynamics, fast transients, a fuller presentation and excellent vocal density and texture.
iBasso’s block diagram shows the Nutube on its own 22.5V anode supply and filament supply, followed by a JRC volume IC, a phase inverter and a headphone amplifier of op-amps and five transistor pairs per leg; in Super Class A mode the signal goes straight to the headphone amplifier.
2,150mW with 12V DC-IN
With iBasso’s 12V DC-IN external power, the headphone amplifier’s supply rises from ±6.5V to ±12V, and the AMP19 delivers up to 2,150mW + 2,150mW into 32Ω, giving the portable DX340 far more drive for demanding headphones.
Careful engineering
In Tube mode, a JRC hardware volume control adjusts the level in 100 fine analogue steps rather than by digital attenuation, so the DAC signal stays intact, noise stays low at low volume and detail and layering are kept, whether you use sensitive IEMs or high-impedance headphones. To keep tube microphonics down, PORON material suspends the Nutube in the chassis to absorb shock and vibration. Before shipping, every card is tested on an Audio Precision APx555 analyser, and iBasso engineers calibrate and match the Nutube circuit by hand with four multi-turn potentiometers, so each card sounds the same.
| Super Class A, 4.4mm | 8.3 / 5.8 / 3.8 / 1.8Vrms (super / high / mid / low gain) · 2,150mW + 2,150mW @ 32Ω (12V DC), 1,000mW + 1,000mW (battery) · THD+N −109dB · SNR and dynamic range 121dB · crosstalk −114dB · output impedance 1.4Ω |
|---|---|
| Super Class A, 3.5mm | 4.15 / 2.92 / 1.89 / 0.89Vrms · 500mW + 500mW @ 32Ω (12V DC), 260mW + 260mW (battery) · THD+N −105dB · SNR 110dB · output impedance 0.7Ω |
| Tube, 4.4mm | 7.7 / 4.53 / 2.92 / 1.55Vrms · 1,850mW + 1,850mW @ 32Ω (12V DC), 590mW + 590mW (battery) · 1.4Ω |
| Tube, 3.5mm | 3.7 / 2.3 / 1.49 / 0.79Vrms · 428mW + 428mW @ 32Ω (12V DC), 165mW + 165mW (battery) · 0.7Ω |
| Frequency response | 10Hz–40kHz (±1dB) |
| Compatibility | iBasso DX340 (firmware V1.08 or later) |
Good to know
- The DX340 needs firmware 1.08 or later to use the AMP19. The DX340 and 12V DC-IN supply are sold separately.
- In the box: AMP19 card, screwdriver and four screws.
In the box
- iBasso AMP19 Amplifier Card
- Screwdriver
- Screws x4
THE FINER DETAILS
Built for
better listening.
Know what you’re choosing.
Find the right fit for your setup.
- Headphone outputs
- 4.4mm balanced · 3.5mm
- Output power
- Super Class A: 2,150mW + 2,150mW @ 32Ω (12V DC) · 1,000mW (battery) · Tube: 1,850mW (12V DC) · 590mW (battery), 4.4mm
- Frequency response
- 10Hz–40kHz ±1dB
- Compatibility
- iBasso DX340 (requires firmware V1.08 or above)
- Gain modes
- Low / Mid / High / Super
- Signal-to-noise ratio
- 121dB (4.4mm, Super Class A)
- Distortion (THD+N)
- −109dB (4.4mm, 300Ω, Super Class A)
- Output impedance
- 1.4Ω (4.4mm) · 0.7Ω (3.5mm)
- Crosstalk
- −114dB
- Amplification
- KORG Nutube 6P1 tube mode · fully discrete Super Class A mode (20 dual transistors)
- Power
- Battery or 12V DC external power (iBasso 12V DC-IN)
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.
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