Books

Transformers, Cores and Supply Units


UNITRA
Transformers, Cores and Supply Units

CONTENTS

  • GENERAL INFORMATION (1)
  • MAIN TRANSFORMERS (3)
  • LOUDSPEAKER TRANSFORMERS AND VERTICAL DEFLECTION OUTPUT TRANSFORMETS (12)
  • MINIATURE AND CONTROL TRANSFORMERS (20)
  • REACTOR FOR SUPPLY UNIT FILTERS (24)
  • SUPPLY UNITS (26)
  • t\THERMISTOR THERMAL RELAY PTT-3 (35)
  • PARTS OF TRANSFORMERS AND REFRACTORS (38)
  • PARTS OF TRANSFORMERS AND REACTORS (38)

The material was provided by Grzegorz Makarewicz, 'gsmok' 

Electrostatic Loudspeaker Design and Construction


Ronald Wagner
Electrostatic Loudspeaker Design and Construction
Audio Amateur Press Publishers, Peterborough, New Hampshire, Second Edition, First Printing 1993

Contents

  • Preface (ix)
  • Acknowledgments (ix)
  • Intriduction
  1. How it Began (1)
  2. Electromagnetic Speakers (20)
  3. Speaker Measurements (45)
  4. Electroctatic Loudspeakers (59)
  5. Building a Full-Range Electrostatic Speaker (80)
  6. Frames and Ribs (92)
  7. Preliminary Assembly (1120
  8. Preliminary Speaker Testing (118)
  9. Stretching Frame (122)
  10. Final Speaker Assembly (137)

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Modern High-End Valve Amplifiers based on toroidal output transformers


Ir. Menno van der Veen
Modern High-End Valve Amplifiers based on toroidal output transformers
Elector Electronics, Dolchestr, England, 1999

CONTENTS

  • About the author (xiii)
  • Introduction (xv)
  1. Why Valve Amplifiers?
  2. Output Teansformer Specifications
  3. The Output Transformer, Valves and Loudspeaker
  4. The Output Transformer in the Complex Domain
  5. Frequency-Domain Calculations for Toroidal Output Transformers
  6. Theory of Overall Negative Feedback
  7. Output Transformer Low-Frequency Tuning
  8. Special Output Coupling Techniques
  9. Single-ended Toroidal Output Transformers
  10. Building a Push-Pull Valve Amplifier: the Phase Splitter
  11. Building a Push-Pull Valve Amplifier: from 10 to 100 Watts

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Build your own audio valve amplifiers


Rainer zur Linde,
Build your own audio valve amplifiers
Circuits for hi-fi and musical instruments
Elector Electronics (Publishing) P.O. Box 1414 Dorchester England DT2 8YH,
First Published in the United Kingdom 1995, This Edition September, 1997

Contents

Introduction

   To most people working in electronics, the thermionic valve or electron tube is history. Indeed, few of us would be content nowadays without the ease of use, the technical quality, the low weight and the small dimensions of transistorized or integrated electronic equipment. None the less, for many hi-fi enthusiasts and musicians, a valve amplifier still forms the nucleus of their audio equipment. The combination of modern high-quality peripheral equipment (signal sources, loudspeakers) and a classical valve amplifier to come into their own as far as tonal quality is concerned. In modern hi-fi valve amplifiers much attention is paid to obtaining a signal transfer that is as nearly linear as possible. This obviates the need of complex tone control, which is the past were necessary to mask the deficiencies of signal sources then available. For instance, a CD player does not produce stylus noise which, when the audio was young, was combatted by chopping off the higher frequencies so as to obtain an acceptable sound quality (which modern listeners would not tolerate).

   Whether it is nostalgia, interest in the technical parameters, the appeal of a gleaming amplifier chassis with softly glowing valves, respect for the technical know-how of earlier generation, or perhaps the firm conviction that the sound of a valve amplifier can not be bettered, it is a fact that this technical tradition, which deserves a place of honour in any science museum, is still in demand. It is particularly gratifying that many of the younger generation admire valve amplifiers. Perhaps this is due to the popularity of the electric guitar.

   The field of the thermionic valve is extensive, shown by the enormous amount of literature it attracted in the 1960s.

   This book is intended for a broad cross-secion of the public: apart from projects for preamplifiers, power amplifiers, and two amplifiers for musical instruments, aimed at the practical audio/hi-fi enthusiast, it offers much information on the operation od electron tubes, while the first chapter gives a short history of the thermionic valve.