90%
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.
WATT RECOMMENDS
Save your favorites. Compare them anytime.
Create a free HiFi Hub account to save products to your Wishlist and compare your favorites side by side.
Professional Reviews 90/100
Deliciously Crispy
Sound Quality
91/100
Build Quality
93/100
Value for Money
85/100
T+A’s M 40 HV marries room-shaking dynamics with exceptional loudspeaker control, but its High Current mode is the real attraction: richer tone, natural textures and a seamless, room-filling soundstage. HiFi News found its instrumental detail, vocal presence and effortless scale especially compelling, while 60W of Class A operation brings genuine musical warmth to this monumental monoblock.
What Reviewers Are Saying
Pros
High Current mode delivers rich, natural, seamless sound with strong vocal and instrumental presence.
Produces effortless, thrilling dynamics, powerful attack and room-shaking low-frequency impact.
Exceptional speaker control, detailed resolution and convincing large-scale presentation.
Monumental construction includes substantial heatsinking, massive power supply reserves and flexible bi-amping connectivity.
&
Cons
High Power mode can sound comparatively mechanical, with drier timbres and less organic image integration.
Each monoblock weighs more than 50kg, making placement and installation challenging.
SOUND QUALITY PERFORMANCE 91/100
The M 40 HV combines exceptional scale, attack and low-level detail with a notably mode-dependent character. High Current operation drew praise for a rich, natural and seamless presentation, while High Power mode could sound more mechanical and less emotionally involving.
Transparency Resolution
92/100
The review highlights shiver-inducing instrumental detail, with voices and instruments filling out clearly as the presentation becomes richer and more resolved. It is described as well delineated and natural in its preferred High Current mode.
Tonal Balance Musicality
89/100
In High Current mode, the amplifier is praised for its gorgeously rich, natural sound, warm enveloping acoustic and convincing vocal character. High Power mode is less consistently satisfying, however, with somewhat parched timbres and a mechanical, anonymous quality noted.
Dynamics
96/100
The M 40 HV plays as loudly as anyone could reasonably want without apparent effort, delivering dynamics with thrilling force. Its attack and drama are described as beyond reproach, while drum impacts have room-shaking, heart-thumping physicality.
Soundstage Imaging
86/100
The amplifier can create a room-filling, seamless sonic picture and, on live material, a persuasive sense of audience presence. In High Power mode, though, images were said to layer more like a relief map than cohere into an organic whole.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
93/100
These are genuinely monumental monoblocks, each weighing more than 50kg and fitted with substantial carrying handles and heatsinks that effectively dissipate heat without fan noise. The review documents a serious internal power supply, including more than 180,000µF of capacitance, shielded 1000W transformers, substantial speaker terminals, bi-amping capability, balanced connections and trigger control.
Value for Money
85/100
At £37,500 per pair, the M 40 HV Anniversary is firmly positioned as a flagship purchase, with limited anniversary-year production adding exclusivity. The review states the price but offers little direct comparison with competing amplifiers or verdict on value at this level.
Reviews
Online Reviews & Mentions
YouTube Reviews
Forum Mentions
No forum mentions found yet
Verified Dealers
Online Dealers
All Dealers
Zoom out the map to see more dealers
Authorized dealers for T+A M 40 HV
- 110Hz — online and in-store — Kielce, Województwo świętokrzyskie, Poland (website)
- Acoustic Streams — in-store — Lower Drift, England, United Kingdom (website)
- Alen Audio — in-store — Extramurs, Comunidad Valenciana, Spain (website)
- Alpha High End — online and in-store — Brasschaat, Vlaams Gewest, Belgium (website)
- American Sound — in-store — Richmond Hill, Ontario, Canada (website)
- AUDIO 2000 — in-store — Wuppertal, Nordrhein-Westfalen, Germany (website)
- Audio 46 — online and in-store — New York, New York, United States (website)
- Audio Concierge — online and in-store — England, United Kingdom (website)
- AUDIO EXCLUSIVE — in-store — Wels, Oberösterreich, Austria (website)
- Audio Gallery — online and in-store — Las Rozas de Madrid, Comunidad de Madrid, Spain (website)
and 95 more verified dealers