iBasso AMP19

The AMP19 is a NuTube + Super Class A Amp Card for iBasso DX340 — Two output modes to choose from one compact amp card.

The Tubes
Sixth-generation Nutube 6P1 triode vacuum tube, which was developed jointly by Korg and Noritake for a warmer, natural sound. Super Class A Mode utilising 20 dual transistors to build a discrete component amplifier, which is capable of delivering up to 2A current output. The abundant current reserve offers powerful energy and dynamic performance, quick transient response, fuller sound, and excellent vocal density and texture.

• Over 30,000 hours lifespan
• Power consumption only 2% of traditional tubes
• Size approximately 30% of traditional tubes

The AMP19 uses a "hanging" installation method using PORON material to suspend the tubes within the chassis. This innovative approach effectively achieves shock absorption while significantly suppressing microphonic effect.

The Super Class-A
Utilizes 20 dual transistors to build a discrete component amplifier, which is capable of delivering up to 2A current output. The abundant current reserve offers powerful energy and dynamic performance, quick transient response, fuller sound, and excellent vocal density and texture.

Power
When connected to 12V DC External power source, the headphone amplifier power supply is boosted from ±6.5V to ±12V, reaching 2150mW + 2150mW @ 32Ω, which will easily drive all flagship headphones. Portable in form, but with the driving power comparable to desktop units—this is one of AMP19’s strengths.

Volume control
In Tube mode, AMP19 uses JRC hardware volume control, which adjusts output volume via an analog method, ensuring that the DAC signal remains fully intact, avoiding digital volume attenuation and preserving audio fidelity. It effectively reduces output noise at low volumes, maintaining clear, detailed sound and full music layering even at low listening levels. The volume control provides 100 fine volume steps, allowing precise adjustment for high-sensitivity in-ear monitors or high-impedance headphones.

When using solid states, it utilizes the volume control provided by the DSP.

SPECIFICATIONS:

(A) SUPER CLASS-A MODE:

4.4mm Balanced Phone Out Output Level:

• 8.3Vrms (Super Gain)
• 5.8Vrms (High Gain)
• 3.8Vrms (Mid Gain)
• 1.8Vrms (Low Gain) 

Output Power:

• 2150mW + 2150mW @ 32Ω (12V DC-IN)
• 1000mW + 1000mW @ 32Ω (Battery) 

THD+N: -109dB (A-weighted, 300Ω load)
Signal-to-Noise Ratio: 121dB
Dynamic Range: 121dB
Crosstalk: -114dB
Frequency Response: 10Hz - 40kHz ±1dB
Output Impedance: 1.4Ω 

3.5mm Single-ended Phone Out Output Level: 

• 4.15Vrms (Super Gain)
• 2.92Vrms (High Gain)
• 1.89Vrms (Mid Gain)
• 0.89Vrms (Low Gain) 

Output Power:

• 500mW + 500mW @ 32Ω (12V DC-IN)
• 260mW + 260mW @ 32Ω (Battery) 

THD+N: -105dB (A-weighted, 300Ω load)
Signal-to-Noise Ratio: 110dB
Dynamic Range: 110dB
Crosstalk: -114dB
Frequency Response: 10Hz - 40kHz ±1dB
Output Impedance: 0.7Ω

(B) TUBE MODE:

 4.4mm Balanced Phone Out Output Level:

• 7.7Vrms (Super Gain)
• 4.53Vrms (High Gain)
• 2.92Vrms (Mid Gain)
• 1.55Vrms (Low Gain) 

Output Power: 1850mW + 1850mW @ 32Ω (12V DC-IN) , 590mW + 590mW @ 32Ω (Battery)
Frequency Response: 10Hz - 40kHz ±1dB
Output Impedance: 1.4Ω

3.5mm Single-ended Phone Out Output Levels:

• 3.7Vrms (Super Gain)
• 2.3Vrms (High Gain)
• 1.49Vrms (Mid Gain)
• 0.79Vrms (Low Gain) 

Output Power:428mW + 428mW @ 32Ω (12V DC-IN),165mW + 165mW @ 32Ω (Battery) Frequency Response: 10Hz - 40kHz ±1dB
Output Impedance: 0.7Ω