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T+A M 40 HV
The Mono Power Amplifier
The M 40 HV provides our HV-series High-Res players and pre-amplifiers with an extremely unique, uncompromising power amplifier which satisfies the most extreme audiophile demands under a vast range of operating conditions. Of course, it can also be used to form the perfect power amplifier for any other High-End set of equipment. One thing we have learned in our forty-year history is that the world of electro-acoustics does not permit a single perfect solution to all requirements; instead every overall design philosophy offers its own strengths and weaknesses. And that is why we have consistently developed optimum solutions for each requirement, whether it is based on valve technology or the very latest form of digital signal processing.
Valve Technology
To achieve all this we have equipped our finest power amplifier with a circuit design which is unique in the world, combining classic analogue techniques, valve technology, High Voltage amplifier design and intelligent parameter control. The entire input amplification section is based on carefully selected High-End valves of the 6SN7 type, operating in Class-A mode. This results in a very harmonious sonic image, and instils the musical and tonal advantages of valve technology in the sound character of the M 40 HV.
Amplifier Concept
The input stage is designed as a symmetrical differential amplifier exploiting an all-valve cascode circuit. The subsequent voltage amplifier stage is a High Voltage (HV) J-FET amplifier circuit with triode performance characteristics, which also operates in pure Class-A mode. The result is excellent bandwidth and an agile performance which defines the sound qualities of the amplifier as a whole.
At the input side the current amplifier stages are based on MOSFET driver transistors whose performance curve harmonises superbly with the HV voltage amplifier stage. At the output side the current amplifiers are equipped with no fewer than twenty extremely high-performance ring emitter bi-polar transistors. These components satisfy the most extreme demands in terms of current supply capacity and bandwidth.
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T+A M 40 HV
T+A's M 40 HV pairs monumental power with refined musicality. Derived from the M10 and built as a limited-anniversary flagship, it couples vast headroom and a huge 180,000 µF supply with ~1,000W transformers to deliver effortless dynamics and room-shaking impact. In High Power the amplifiers offer uncompromising slam and control; flip to High Current and the presentation becomes richer, more detailed and harmonically natural thanks to valve preamp stages and an intelligently fanless thermal design. The result is taut bass, a warm midrange and convincing scale, with imaging that can be spectacular though occasionally a touch technical. Built like a 50+kg monolith with bi-amping options and robust shielding, the M 40 HV is aimed at serious two-channel systems and large speakers. Read the full appraisal from Andrew Everard at HiFi News.
Pros
- Extraordinary power and dynamic control — delivers effortless headroom and impactful transients suitable for demanding speakers.
- Transformative High Current mode yields a richer, more natural and harmonically detailed presentation with lush midrange and strong instrumental detail.
- Flagship mechanical and electrical build: 50+ kg monolithic chassis, extensive heatsinking, large-capacitance PSU and substantial transformers with bi-amping connectivity.
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Cons
- In High Power mode the presentation can feel a little mechanical or clinical compared with the warmer High Current setting.
- Extremely large and heavy (50+ kg per unit), requiring assistance to move and install; limited-edition Anniversary production may constrain availability.
Sound Quality
92/100
Dynamics
94/100
Reviewers repeatedly praise the amp's effortless authority and slam — 'go as loud as anyone sane could want without a hint of effort' and 'crashing out dynamics in truly thrilling fashion' — indicating top-tier headroom and transient grip for a high‑power Class AB design. The monolithic, heavy monoblock construction and large transformer/capacitor bank (each transformer ~1000W; 180,000 µF total) support the reviewers' impression of abundant current delivery and unflappable control, justifying an exceptional dynamics score.
Soundstage Imaging
88/100
Spatial performance is generally excellent — reviewers heard a 'plausibly live experience' with convincing presence and lush brass — but imaging occasionally felt 'technical' or layered like a 'relief map' rather than fully organic. Channel separation and scale remain convincing under demanding material, but slight dryness in timbre cost a few points.
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Build Quality
95/100
Massive monolithic construction (50+ kg per unit), substantial heatsinks, large steel shielding, high-capacity power supply (180,000 µF) and hefty transformers (~1000W each) point to flagship mechanical and electrical design. The lack of fan cooling and robust thermal design, plus the feel of monoblocks rather than mere stereo boxes, supports a top-tier build rating.
Value for Money
86/100
The reviewer lists the price (￡37,500 per pair) and highlights the amplifier's very high power/headroom (large transformers, huge capacitance), but offers no explicit comparative judgment against peers. In the context of flagship monoblocks from makers such as Pass Labs, d'Agostino and McIntosh, this sits firmly in high‑end territory; because the review does not state whether the premium is justified relative to those peers, the score follows the neutral baseline (mid‑80s).
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