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A Toolbox for Audio Lovers and Engineers Without any ambition to reach scientific levels, this book aims to be a toolbox for both audio lovers and high-end equipment designers. The elementary theory presented is the bare minimum for readers to grasp the operation and practical use of electrical, electromagnetic, physics, and electronic operations available in the designers’ toolbox. Each tool is explained in a minimum of words and theory without needless coverage of underlying equations or figures. The book chapters guide you through the process of designing quality amplifiers with vacuum tubes, from the very beginning, considering both technical and subjective requirements – in theory and practice. The book is a compilation of the author’s notes used in his professional and educational career but was nevertheless primarily written as a result of true love for the audiophile hobby.

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From SRPP and Mu-Follower to OTL Designs Tube amplifiers suffer from distortion. Fortunately, circuits such as the SRPP amplifier, mu-follower, and beta-follower produce minimal distortion even at output voltages of 50 to 100 Vpeak. These designs are often published with errors. Without a sound understanding of the theory, it is easy to arrive at a flawed design. In the first section of this book, we investigate the origin of distortion, while in the second we investigate the design of and SRPP and a mu-follower. On the internet we can find the most exotic designs. Evaluating them teaches us that these designs often make matters worse rather than better. In the chapter on incorrect SRPPs and mu-followers, we sometimes see bizarre and misguided designs where using a simple single-triode amplifier would perform much better. Push-pull output stages also exist. A great number of them are examined, and their similarity to the SRPP is discussed. This is done especially with the help of the theory behind the OTL based on the ‘mother’ of all OTLs, the Philips HF303. Finally, attention is given to frequency characteristics and technical matters such as the supply voltage and the filament power supply. To illustrate these points, there are a few designs covering the subjects discussed. This book presents much new theory that has not been published before. It is often an eye-opener, showing that many things have a beautiful and unexpected simplicity.

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A Toolbox for Audio Lovers and Engineers Without any ambition to reach scientific levels, this book aims to be a toolbox for both audio lovers and high-end equipment designers. The elementary theory presented is the bare minimum for readers to grasp the operation and practical use of electrical, electromagnetic, physics, and electronic operations available in the designers’ toolbox. Each tool is explained in a minimum of words and theory without needless coverage of underlying equations or figures. The book chapters guide you through the process of designing quality amplifiers with vacuum tubes, from the very beginning, considering both technical and subjective requirements – in theory and practice. The book is a compilation of the author’s notes used in his professional and educational career but was nevertheless primarily written as a result of true love for the audiophile hobby.

Lis (+) (–)

From SRPP and Mu-Follower to OTL Designs Tube amplifiers suffer from distortion. Fortunately, circuits such as the SRPP amplifier, mu-follower, and beta-follower produce minimal distortion even at output voltages of 50 to 100 Vpeak. These designs are often published with errors. Without a sound understanding of the theory, it is easy to arrive at a flawed design. In the first section of this book, we investigate the origin of distortion, while in the second we investigate the design of and SRPP and a mu-follower. On the internet we can find the most exotic designs. Evaluating them teaches us that these designs often make matters worse rather than better. In the chapter on incorrect SRPPs and mu-followers, we sometimes see bizarre and misguided designs where using a simple single-triode amplifier would perform much better. Push-pull output stages also exist. A great number of them are examined, and their similarity to the SRPP is discussed. This is done especially with the help of the theory behind the OTL based on the ‘mother’ of all OTLs, the Philips HF303. Finally, attention is given to frequency characteristics and technical matters such as the supply voltage and the filament power supply. To illustrate these points, there are a few designs covering the subjects discussed. This book presents much new theory that has not been published before. It is often an eye-opener, showing that many things have a beautiful and unexpected simplicity.

Lis (+) (–)

Ce livre se concentre davantage sur les aspects pratiques que sur la théorie, et il a un caractère contemplatif, comme si l'auteur regardait des amplificateurs d'en haut. Les éléments de connaissances sont intégrés et placés dans le contexte d’un large aperçu. Même aujourd’hui, les amplificateurs à tubes sonnent toujours bien, peut-être mieux que jamais. Cela est dû en partie au fait que nous avons désormais accès à des composants modernes tels que des transformateurs de sortie toroïdaux, des résistances et des condensateurs de très haute qualité et de nombreux types de fils dotés de bonnes propriétés acoustiques. Les sources audio modernes, telles que les lecteurs CD, et les derniers haut-parleurs haut de gamme nous permettent également d'apprécier à quel point les amplificateurs à tubes reproduisent la musique encore mieux qu'auparavant. Ce nouveau livre de Menno van der Veen examine les amplificateurs à tubes d'un point de vue plus que théorique. Il se concentre principalement sur la phase de conception, au cours de laquelle des décisions doivent être prises concernant le but et les exigences de l'amplificateur, et aborde les questions suivantes : Quel est le rapport entre ces aspects et des critères subjectifs et objectifs ? Quels circuits sonnent le mieux et pourquoi ? Si vous souhaitez développer et commercialiser un amplificateur, à quels problèmes devez-vous vous attendre ? Quelle est la signification et la signification des mesures ? Sont-ils encore significatifs ou ont-ils perdu de leur pertinence ? Grâce à l’énorme puissance de traitement des ordinateurs, nous pouvons désormais mesurer plus de détails que jamais. Comment ces nouvelles méthodes peuvent-elles être appliquées aux amplificateurs à tubes ? Auparavant, il suffisait de mesurer la gamme de fréquences, la puissance et la distorsion d'un amplificateur pour caractériser l'amplificateur. Ces mesures sont-elles encore suffisantes, ou devrions-nous commencer à mesurer en fonction de la façon dont nous entendons, en utilisant de vrais signaux musicaux au lieu des formes d'onde provenant de générateurs de signaux ? L'auteur esquisse un avenir où les mesures d'amplificateurs conformes à notre sens de l'ouïe nous permettront d'aboutir à de nouvelles connaissances. Ce livre se concentre davantage sur les aspects pratiques que sur la théorie, et il a un caractère contemplatif, comme si l'auteur regardait des amplificateurs d'en haut. Les éléments de connaissances sont intégrés et placés dans le contexte d’un large aperçu.

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Jan Didden a créé Linear Audio en 2010 et a publié 14 volumes entre 2010 et 2017. Chaque volume de 200 pages contient en moyenne 10 articles rédigés par des auteurs experts dans le domaine de l'audio, de l'acoustique et de l'instrumentation. Que vous vous intéressiez aux amplificateurs à tubes, aux équipements à semi-conducteurs, à la conception de haut-parleurs, à la distorsion des condensateurs et des résistances ou à la mesure de la distorsion, vous y trouverez certainement des conseils utiles et des réflexions intéressantes. Du niveau débutant au niveau avancé, pour le professionnel de l'audio ou l'amateur sérieux, cette collection d'experts vous permettra d'améliorer votre compréhension et vous offrira de nouvelles perspectives sur des problématiques courantes. Le contenu bonus inclus dans cette collection est constitué d'une série YouTube en 5 parties sur le feedback négatif appliqué à l'audio par l'auteur renommé Jan Didden, en plus de neuf articles et présentations audio de référence. Si vous vous intéressez sérieusement à l'audio, à l'acoustique et à l'instrumentation, ne manquez pas cette collection ! Le contenu publié est indexé et entièrement consultable et constituera une ressource presque illimitée pour l'avenir. Vous pouvez en savoir plus sur les auteurs deLinear Audio et la table des matières de chaque volume à linearaudio.net.

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Menno van der Veen is well known for his research publications on tube amplifiers used in audio systems. In this book he describes one of his research projects which focuses on the question of whether full compensation for distortion in tubes and output transformers is possible. In the past, a variety of techniques have been developed. One of them has largely been forgotten: trans-conductance, which means converting current into voltage or voltage into current. Menno van der Veen has breathed new life into this technique with his research project titled “Trans”. This book discusses all aspects of this method and discusses its pitfalls. These pitfalls are addressed one by one. The end result is a set of stringent requirements for Trans amplifiers. Armed with these requirements, Menno then develops new Trans amplifiers, starting with Transie 1 and Transie 2. These DC-coupled, single-ended tube amplifiers have unusually good characteristics and are suitable for hobbyist construction. Next the Trans principle is applied to amplifiers with higher output power. A trial-and-error process ultimately leads to the Vanderveen Trans 30 amplifier, which optimizes the features of Trans. The characteristics of this amplifier are so special and unique that Menno believes he has struck gold. To ensure that variations in tube characteristics cannot interfere with optimal Trans behavior, Menno makes use of simulations and comparison with other amplifier types. This book reads like an adventure story, but it is much more – it is an account of solid research into new ways to achieve optimal audio reproduction.

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A Practical Guide to Tube Electronics Vacuum tubes continue to exert a special fascination. Their long-lasting operation, robustness, and characteristic behavior fundamentally distinguish them from modern semiconductor technology. Despite their age, tubes are by no means merely historical components; they are still used today in audio technology, measurement technology, and especially in hobbyist applications. This book is aimed at electronics enthusiasts and hobbyists who want to not only learn about and understand vacuum tubes in theory, but also use them in practice. It conveys the fundamentals of tube technology, explains the different designs and designations, shows typical circuits, and addresses power supplies, measurements, and safety-related aspects. The focus is on practical explanations and realistic examples from the workshop. Numerous tips help you avoid typical mistakes, build circuits, and understand tube devices and their construction. Basic knowledge of electronics is assumed. Vacuum Tubes: A Practical Guide to Tube Electronics offers an accessible and thorough introduction to tube technology – factual, comprehensible, and with a clear focus on practical applications.

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A Practical Guide to Tube Electronics Vacuum tubes continue to exert a special fascination. Their long-lasting operation, robustness, and characteristic behavior fundamentally distinguish them from modern semiconductor technology. Despite their age, tubes are by no means merely historical components; they are still used today in audio technology, measurement technology, and especially in hobbyist applications. This book is aimed at electronics enthusiasts and hobbyists who want to not only learn about and understand vacuum tubes in theory, but also use them in practice. It conveys the fundamentals of tube technology, explains the different designs and designations, shows typical circuits, and addresses power supplies, measurements, and safety-related aspects. The focus is on practical explanations and realistic examples from the workshop. Numerous tips help you avoid typical mistakes, build circuits, and understand tube devices and their construction. Basic knowledge of electronics is assumed. Vacuum Tubes: A Practical Guide to Tube Electronics offers an accessible and thorough introduction to tube technology – factual, comprehensible, and with a clear focus on practical applications.

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Valve Amplifiers are regarded by many to be the ne plus ultra when it comes to processing audio signals. The combination of classical technology and modern components has resulted in a revival of the valve amplifier. The use of toraidal-core output transformers, developed by the author over the past 15 years, has contributed to this revival. The most remarkable features of these transformers are their extremely wide frequency ranges and their very low levels of linear and nonlinear distortion. This book explains the whys and wherefores of toroidal output transformers at various technical levels, starting with elementary concepts and culminating in complete mathematical descriptions. In all of this, the interactions of the output valves, transformer and loudspeaker form the central theme. Next come the practical aspects. The schematic diagram of a valve amplifier often appears to be very simple at first glance, but anyone who has built a modern valve amplifier knows that a lot of critical details are hidden behind this apparent simplicity. These are discussed extensively, in connection with designs for amplifiers with output powers ranging from 10 to 100 watts. Finally, the author gives some attention to a number of special valve amplifiers, and to the theory and practice of negative feedback. In summary, this book offers innovative solutions for achieving perfect audio quality. Do-it-yourself builders, as well as persons who want to gain a deeper technical understanding of the complex world of audio transformers, valve amplifiers and audio signal processing, will find this book a rich and useful source of information.

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