NAT Audio — Amplifiers
Magneto Evo Hybrid Power Amplifier
A single-stage hybrid masterwork of pure class A power.
The Magneto Evo represents a singular achievement in amplifier design, realised through a radical commitment to circuit simplicity. By utilising a direct-coupled, single-stage architecture, the signal travels from the input socket to the loudspeaker terminals via a solitary active device, ensuring an unprecedented level of transparency and musical integrity.
Positioned as an avant-garde hybrid power amplifier, the Magneto Evo bridges the gap between the harmonic richness of thermionic devices and the current-delivery capabilities of advanced semiconductors. It employs a high-grade nuvistor triode—selected for its immunity to vibration—paired directly with a scientific-grade FET, allowing the amplifier to operate with extreme efficiency while maintaining a pure class A, single-ended signature.
The sound character is defined by its astonishing immediacy and rhythmic precision. Because the design avoids the typical interference of passive components or feedback loops, the amplifier presents music with a tactile, holographic quality. It possesses the capability to drive virtually any loudspeaker load with authority, delivering a combination of speed, control, and harmonic naturalness that is rarely found in traditional power amplifier designs.
Key Features
01
Single-stage signal path
The signal is processed by only one active device, eliminating capacitors, resistors, chokes, and transformers from the path.
02
Hybrid NuFET topology
Pairs a vibration-immune nuvistor triode directly with a high-power gold-plated FET for a unique single-ended class A performance.
03
Direct-coupled design
Operates without any DC-blocking capacitors or transformers between input and output to ensure ultimate signal fidelity.
04
Highly efficient class A
Delivers 100W of power while maintaining the linearity and heat management of a sophisticated hybrid circuit.
05
Regulated constant current power supply
Employs an encapsulated, noiseless power unit with 100,000uF of audio-grade energy storage to ensure consistent current delivery.
Chapter 01
Design & Philosophy
The Magneto Evo is built on the belief that circuit simplicity is the ultimate goal of high-end audio. By replacing complex multi-stage circuits with a single, high-performance hybrid gain stage, the design minimises the potential for phase shift and distortion. This approach transforms the amplifier into a virtual 'clean window' for the source signal, removing the artificial 'negotiations' that typically occur within multi-stage amplifiers.
Chapter 02
Build & Materials
Quality extends to every component within the Magneto Evo. The unit features silver-OFC air-dielectric internal wiring, military-grade PTFE capacitors, and hand-coiled output inductors. The entire structure is hand-assembled by skilled technicians using a point-to-point wiring technique that avoids the use of printed circuit boards, ensuring the best possible integrity for both the signal and power paths.
Chapter 03
Listening Notes
The Magneto Evo offers a level of transient speed that brings recorded performances to life with startling realism. It does not soften the output as some tube designs do, nor does it sound sterile; instead, it retains the natural textures of acoustic instruments and the expansive scale of complex dynamic passages. It is a reference-grade tool for listeners who demand complete honesty from their audio system.
Specifications
TypeSingle-ended class A monoblock hybrid power amplifier
Frequency response5 Hz to 50 kHz (-3 dB)
Power / output100 W @ 8 ohms / 70 W @ 4 ohms
Inputs / outputsRCA input; high-quality loudspeaker terminals for 4 and 8 ohms
Dimensions (H × W × D)260 mm × 483 mm × 400 mm
Weight53 kg per monoblock
Finish optionsBlack or silver