AGD GaNTube88KT Mkiii Amplifier
Best power amplifier for audiophiles seeking pristine, high-fidelity sound reproduction.
Discover acoustic perfection with the AGD GaNTube88KT Mkiii Amplifier, a result of two years of dedicated development. This advanced module significantly enhances sound quality through re-engineered PWM and output filter components. Experience dramatically reduced distortion, lower noise, expanded bandwidth, and lightning-fast response times. It maintains a high 800KHz operating frequency and boasts a power stage frequency response flat up to 60KHz, with greatly increased slew rates. Achieve up to 250W RMS output into 4Ω when paired with Vivace MKII mono-blocks, for an unparalleled audio experience.
$1500.00
Owner Satisfaction
4.9
/ 5
Category Rank
4
/ 1685
#4 in Power Amplifiers
Price vs Category Average
-82%
Below average
Maximum Output Power (4Ω, 20Hz–20KHz)
250
/ W
Who it's for
- Audiophiles seeking pinpoint detail and lightning-fast musical transients
- Listeners craving tube-like warmth without the maintenance of vacuum tubes
- Homeowners wanting high-performance power without excessive heat output
Who should skip it
- Budget-conscious buyers looking for high-value entry-level amplification
- Users needing local repair options or immediate service turnaround
- Purists demanding the specific texture of traditional analog amplification
Performance breakdown
Signal Clarity
The -140dB noise floor ensures an incredibly clean and silent background.
Transient Response
Significantly increased slew rates deliver lightning-fast, precise musical attacks.
Power Efficiency
Advanced GaN technology provides high-output power in a remarkably compact footprint.
Harmonic Precision
Ultra-low distortion levels maintain absolute fidelity to the original recording.
Frequency Extension
Flat response up to 60kHz captures every nuance of high-resolution audio.
Switching Stability
The 800kHz operating frequency ensures smooth, consistent performance across all loads.
Key Specs
Maximum Output Power (4Ω, 20Hz–20KHz)
250 W
Maximum Output Power (8Ω, 20Hz–20KHz)
125 W
THD+N (10W/1KHz)
<0.003 %
Audio Bandwidth (±0.1dB)
20 Hz - 20 KHz
Bandwidth (±0.5dB)
0 Hz - 50 KHz
Noise level (100mVRMS input)
-140 db
GaN Power Module PWM Frequency
~800 kHz
Dimensions
118 mm x 50 mm
Features
- Re-engineered PWM and output filter stages
- Reduced distortion and noise levels
- Expanded bandwidth and faster response
- Power stage frequency response flat to 60KHz
- Significantly increased slew rates
- High 800KHz operating frequency
- Exceptional sound quality leap
- Compact module design
What customers say
The AGD GaNTube88KT Mkiii Amplifier earns high praise for its unique sound signature, successfully merging tube warmth with solid state speed. Listeners consistently note exceptional transparency and a deep, holographic soundstage. The proprietary technology delivers the engaging harmonic richness of classic tube designs without the typical maintenance or heat issues. Users describe the performance as having effortless power and significant musicality, elevating the listening experience. While positioned in the luxury segment, the consensus suggests this innovative amplifier offers a compelling best of both worlds scenario, representing a genuine paradigm shift for serious audio enthusiasts seeking reference grade performance.
Know before you buy
These upgrades significantly lower noise and distortion levels while expanding the amplifier's bandwidth. The result is a cleaner, more responsive sound that maintains high fidelity across a wider frequency range.
The high operating frequency allows for a faster, more precise response to transient signals. This ensures the amplifier can handle complex musical passages with greater accuracy and clarity compared to standard Class D designs.
Yes, the GaNTube88KT Mkiii is designed to handle both 4Ω and 8Ω loads. It delivers 125W RMS into 8Ω and up to 250W RMS into 4Ω, providing sufficient power for a wide variety of speaker configurations.
A flat response up to 60KHz ensures that the amplifier reproduces the full audible spectrum without coloration or roll-off. This provides a more transparent and accurate soundstage, preserving the integrity of high-resolution audio recordings.
With a signal-to-noise ratio of -140dB, the GaNTube88KT Mkiii offers an exceptionally low noise floor. This allows for greater detail retrieval, ensuring that subtle nuances in your music are not masked by background electronic noise.
The GaNTube88KT Mkiii is a compact module measuring 118mm x 50mm, specifically designed for integration into compatible AGD systems like the Vivace MKII. It is not intended as a universal DIY component for any arbitrary amplifier build.
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