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Nagra Audio NAGRA HD PREAMP
Almost 20 years after the release of the mythical preamplifier Nagra PL-P in 1998, Nagra releases one of the most ambitious projects in its history, the HD PREAMP. A perfect companion to the HD AMP, the HD PREAMP features a unique patented technology for volume control based on high quality in-house made transformers. Powered by an external bank of super-caps, dual-mono, tube signal-path without feedback.
The Nagra R&D Department, served by ten skilled and specialized audio engineers, worked on this project for three years with the goal of creating the most revealing and engaging preamplifier in the world. The audio engineers spared no expense and accepted no limitation in developing electronics, mechanics, power supply or in addressing thermal and vibration issues. Each stage of the design also included extensive listening sessions. The result is a striking product in terms of appearance, specification and performance. It will reshape the expectation you may have of what a preamplifier will add to your whole set-up, sources and amplifiers…
The volume control is a patent-pending technology that allows perfect level matching with a much more transparent sound compared to potentiometers and switch resistor technology, because there is no attenuation of the input signal, just an automatic selection of a tap on the Nagra custom output transformer.
The newly developed SuperCapacitor power supply is a new technology which combines the very low noise of a battery with the high current capability of the best linear power supplies.
The audio engineers created a super vibration-free stand to lower the microphonic resonances to a new level.
The HD PREAMP has the best specifications ever achieved by any tube preamplifier, a floor noise lower than -160 dB and 5 Hz to 200kHz frequency response with perfect phase integrity. The impedance input is 50 k Ohm and the output impedance is as low as 0.2 Ohm so that you can drive any amplifier on the market.
The HD PREAMP is able to accurately reproduce a square wave at 16 Hz.
And the sound !
The HD PREAMP reproduces music giving a natural impression, full spectrum bandwidth and extreme stability.
It also produces a precise 3D holographic soundstage. It is very difficult to express the impact of this design as we didn’t think it was possible to achieve such an unbelievable result.
Pure emotion !
Revolutonary volume control
The volume control, the object of a new patent, allows perfect level matching with a much more transparent sound compared to pots and switch resistor technology, because there is no attenuation of the input signal, just an automatic selection of a tap on the Nagra custom output transformer. In addition, left and right levels are identical.
Super capacitor power supply
The newly developed SuperCapacitor power supply is a new technology that combines the very low noise of a battery with the high current capability of the best linear power supplies.
Advanced mechanical isolation
The audio engineers created a super vibration-free stand to lower the microphonic resonances to a new level.
Selected tube circuit
The HD PREAMP has the best specifications ever achieved by any tube preamplifier, 160 dB of signal to noise and 5 Hz to 200kHz frequency response with perfect phase integrity. The impedance input is 50k oHm and the output impedance is 0.2 oHm so that you can drive any amplifier on the market.
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NAGRA HD PREAMP — expansive, musical tube preamplifier
The NAGRA HD PREAMP marries Swiss precision with a distinctly musical tube signature, delivering a massive, three-dimensional soundstage and rich, well-defined lower registers that give recordings real scale. Reviewer Ken Kessler writing for HiFi News highlights its ability to render voices with natural presence while retaining excellent attack, detail and dynamic contrast. Built as a two-chassis system with a heavy, watchmaking-grade finish, motorised ganged volume controls, LEMO PSU cabling and an ergonomic remote, the HD PREAMP is both a technical and aesthetic statement. Ideal for serious audiophiles with large rooms and high-end amplification, it combines extensive connectivity and configurability with peerless build quality. For those in the market for top-tier tube preamplification, the HD PREAMP stands out as a bravura, system-defining component.
Pros
- Exceptional Swiss build and engineering—heavy two-chassis construction, precision controls and premium finish.
- Massive, three-dimensional soundstage imaging that makes speakers 'disappear' and renders convincing spatial depth.
- Rich, natural midrange and authoritative low end with excellent detail, attack and dynamic control for a tube design.
- Comprehensive features and connectivity—XLR/RCA inputs, throughput/record options, motorised matched volume controls and an ergonomic remote.
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Cons
- Very high price positioning that places it in the exclusive top tier of high-end equipment.
- Lacks a dedicated mono switch and a headphone output, which some users may expect at this level.
- Large footprint and substantial weight (two chassis and separate PSU) require generous system space and careful placement.
Transparency
90/100
Reviewers describe Nagra's long-standing obsession with accuracy but note a tasteful layer of tube 'soul' and a 'rosy-warm' presentation. No complaints about hiss or noise are reported; the result is highly resolving and largely 'invisible' while retaining pleasant tube coloration.
Sound Quality
93/100
Dynamics
92/100
Critics note excellent attack, detail and resolution — 'detail, attack and resolution to satisfy the most OCD of listeners' — and a lower-register weight that conveys scale without blurring. The unit preserves micro- and macro-dynamic contrasts convincingly for a tube design.
Soundstage Imaging
94/100
The HD PREAMP produces a massive, three-dimensional soundstage: reviewers repeatedly say the speakers and back wall 'vanish' and call the imaging 'uncanny'. It renders wide, deep presentation and precise two-channel 3D effect consistently.
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Build Quality
96/100
Build quality is hailed as 'astonishing' and likened to Swiss watchmaking (Rolex/Patek Philippe); heavy, well-engineered chassis and a separate power supply with LEMO cabling underscore high-end construction. Motorised ganged volume controls, quality switches and an ergonomic remote further attest to exceptional craftsmanship.
Features Connectivity
88/100
Very well equipped: two balanced (XLR) and three single-ended (RCA) sources, throughput/bypass inputs, record-out configuration options, numerous toggle switches for level/ground/lift and a remote. Motorised matched volume controls, dual LEMO PSU connections and flexible output management put it in the well-featured class.
Value for Money
90/100
Priced in the top tier (~£49.5k cited), reviewers call the cost 'ludicrously Helvetian' but also imply the performance justifies the price for those in this market ('worth experiencing', 'bravura effort'). Sentiment is that it represents a justified premium rather than bargain value.
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