NAT Audio · Vacuum Tube Power Amplifiers
Magma New HPS
The pinnacle of single-ended power, delivering 170 watts of pure triode authority.
The Magma New HPS represents the most ambitious achievement in our power amplifier line. At its heart lies the formidable GM100 vacuum tube, a device of such scale and performance that it defines the boundaries of what is possible in single-ended amplification. By running this tube in a pure Class A configuration without global feedback, we ensure a signal path that preserves the complete emotional and structural integrity of the music.
Positioned as the definitive flagship, this monoblock provides the rare ability to drive almost any loudspeaker load with effortless dynamic range. We have engineered the circuit to optimise the operating point of the output stage, ensuring that this immense power is delivered with total linearity and long-term reliability. It is a design for those who refuse to compromise between the harmonic delicacy of a triode and the drive of a high-power system.
The sound character of the Magma New HPS is defined by its composure, expansive soundstage, and tactile presence. It possesses a rhythmic authority that anchors performances with precision, while retaining the liquid, organic quality of a direct-heated triode. It is not merely a high-power amplifier, but a reference-grade instrument that reveals the full nuance and texture of the finest recordings.
Key Features
01
GM100 direct-heated triode
Utilises the highest-power audio vacuum tube in existence for effortless dynamics.
02
Zero global feedback
A minimalist circuit design that maintains signal purity by avoiding all global feedback loops.
03
Selectable power modes
Offers 170W or 60W operation to suit diverse loudspeaker sensitivities and listening requirements.
04
Super damping factor mode
Features a unique output transformer configuration that enhances control and precision for demanding loads.
05
Regulated power supply
Provides dedicated, independent regulation for both input and output stages for absolute stability.
Chapter 01
Engineering Vision
The Magma New HPS was conceived to solve a fundamental conflict in high-end audio: the need for the purity of single-ended triode design paired with the drive of high-power amplification. By utilizing the GM100, we have moved beyond the traditional limitations of glass-envelope tubes. The design is intentionally robust, focusing on thermal management and mechanical isolation to ensure that the amplifier remains stable even under the most extreme dynamic demands.
Chapter 02
Build & Materials
Constructed within a hand-assembled chassis, the Magma New HPS features a high-mass, non-magnetic cover cage that shields the signal from environmental vibrations. Every internal component, from the custom-wound wide-bandwidth output transformers to the aerospace-grade foil resistors, is selected to maintain absolute transparency. The power supply is similarly over-engineered, storing over 500 Joules of energy to ensure instantaneous current delivery.
Chapter 03
Listening Notes
While it is undeniably powerful, the true strength of the Magma New HPS lies in its lack of electronic signature. It provides a vast, open soundstage that does not collapse under heavy orchestration. Listeners will find that it resolves micro-details with the same ease that it handles macro-dynamic shifts, making it an ideal companion for the world's most capable loudspeaker systems.
Specifications
TypeSingle-ended class A monoblock power amplifier
Frequency response9 Hz to 70 kHz (-3 dB)
Sensitivity1.8 V RMS
Impedance100 kohms
Power handling170 W (high mode) or 60 W (low mode)
Dimensions (H × W × D)260 mm × 300 mm × 530 mm
Weight50 kg per unit
Finish optionsBlack or silver