A swappable amplifier card for the iBasso DX340 with two distinct output modes: a Korg/Noritake Nutube 6P1 vacuum tube for warm,
analog character, and a 20-dual-transistor Super Class A stage (up to 2A) for high-density, dynamic sound. Patented 12V DC-IN power
boosts output to 2150mW+2150mW @32Ω, with 100-step JRC analog volume, APx555-matched tubes, and PORON tube suspension.
Requires DX340 firmware V1.08+.
Two amps in one card. The glow of a real tube, or the grip of Super Class A — your choice.
The AMP19 is a swappable amplifier card for the iBasso DX340, bringing genuine vacuum-tube character and high-current Class A power
into a single portable module. Switch between two distinct output modes to shape your sound exactly the way you want it.
Nutube 6P1 vacuum tube — real tube quality, portable-ready
The AMP19 uses the sixth-generation Nutube 6P1 triode vacuum tube, jointly developed by Korg and Noritake.
It brings the renowned sonic character of traditional tubes to a portable player — warm, natural sound with emotionally engaging
vocals — while being far better suited to stable, long-term portable use:
Over 30,000 hours of lifespan
Power consumption just 2% of traditional tubes
Size approximately 30% of traditional tubes
Two output modes — one card, two sound signatures
The AMP19 packs two entirely different amplifier paths into its compact size:
Tube Mode — the Nutube 6P1 acts as the preamp tube, injecting harmonic richness for a warmer, more relaxed, natural tone.
Vocals and instruments take on softer textures, with a more analog feel and a charming glow.
Super Class A Mode — a fully discrete amplifier built from 20 dual transistors, capable of up to 2A current output.
That abundant current reserve delivers powerful energy, fast transient response, fuller sound, and excellent vocal density and texture.
12V DC external power — 2150mW + 2150mW @ 32Ω
The AMP19 uses a nationally patented 12V DC-IN external power technology*. Connect an external DC source and the headphone
amp supply is boosted from ±6.5V to ±12V, reaching 2150mW + 2150mW @ 32Ω — enough to effortlessly drive virtually any flagship
headphone. Portable in form, but with driving power comparable to a desktop unit. (*Patent no. ZL 2025 1 0707956.3)
JRC hardware volume control — 100-step, tube-noise tamed
In Tube Mode, the AMP19 uses JRC hardware volume control, adjusting output level via an analog method so the DAC signal stays
fully intact — no digital volume attenuation, no loss of fidelity. It effectively reduces output noise at low volumes, preserving clear,
detailed sound and full layering even at quiet listening levels, with 100 fine volume steps for precise control of sensitive IEMs or
high-impedance headphones.
APx555 precision testing — manually matched tubes
Every AMP19 is tested on the Audio Precision APx555 analyzer before shipment, then calibrated and matched by hand — engineers
use four hardware multi-turn potentiometers to ensure consistent Nutube 6P1 operation. The result preserves the natural,
delicate, layered sound of the tube with authentic analog flavor. (Note: using the AMP19 requires updating the DX340 firmware
to V1.08 or above.)
PORON suspension — silence the microphonics
After extensive experimentation, iBasso adopted a "hanging" installation method using PORON material to suspend the tube within the
chassis — effectively absorbing shock and significantly suppressing the microphonic effect that plagues portable tube designs.
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