Valve and Transistor Audio Amplifiers

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November 1997



The audio amplifier is at the heart of audio design. Its performance determines largely the performance of any audio system. John Linsley Hood is widely regarded as the finest audio designer around, and pioneered design in the post-valve era. His mastery of audio technology extends from valves to the latest techniques. This is John Linsley Hood's greatest work yet, describing the milestones that have marked the development of audio amplifiers since the earliest days to the latest systems.

Including classic amps with valves at their heart and exciting new designs using the latest components, this book is the complete world guide to audio amp design.

John Linsley Hood is responsible for numerous amplifier designs that have led the way to better sound, and has also kept up a commentary on developments in audio in magazines such as The Gramophone, Electronics in Action and Electronics and Wireless World. He is also the author of The Art of Linear Electronics and Audio Electronics published by Newnes.

  • Complete world guide to audio amp design written by world famous author
  • Covers classic amps to new designs using latest components
  • Includes the best of valves as well as best of transistors


1;Cover ;1 2;Contents;6 3;Preface;10 4;Chapter 1. Active Components;14 4.1;Valves or Vacuum Tubes;14 4.2;Solid State Devices;24 5;Chapter 2. Passive Components;38 5.1;Inductors and Transformers;38 5.2;Capacitors;43 5.3;Resistors;49 5.4;Switches and Electrical Contacts;52 6;Chapter 3. Voltage Amplifier Stages Using Valves;54 6.1;Circuit Configurations;54 6.2;Grid Bias Systems;54 6.3;Cathode Bias Resistor Calculations;58 6.4;Anode Load Systems;58 6.5;Grounded Grid Stages;60 6.6;The Cascode Circuit;61 6.7;The Long-tailed Pair;61 6.8;The Cathode Follower;62 6.9;The Follower;63 6.10;Tetrodes, Beam-Tetrodes and Pentodes;63 6.11;Load Lines;66 7;Chapter 4. Valve Audio Amplifier Layouts;70 7.1;Single-ended vs. Pushpull Operation;72 7.2;Phase Splitters;74 7.3;Output Stages;77 7.4;Output (Load-matching) Transformer;78 7.5;Effect of Output Load Impedance;81 7.6;Available Output Power;82 8;Chapter 5. Negative Feedback;84 8.1;Benefits of Negative Feedback;86 8.2;Stability Problems;87 8.3;Series and Shunt NFB;88 8.4;The Effect of NFB on Input and Output Impedances;90 8.5;Influence of NFB on Output Impedance;93 8.6;Effect of NFB on the Harmonic Components of the Signal;94 8.7;Practical Valve NFB Systems;95 8.8;The Baxandall Negative Feedback Tone Tontrol System;96 8.9;Frequency Response Equalisation;98 8.10;Filter Circuits Based on NFB;99 9;Chapter 6. Valve Operated Audio Power Amplifiers;106 9.1;The Mclntosh Amplifier;107 9.2;The Williamson Amplifier;108 9.3;Distributed Load Systems;111 9.4;The Quad System;112 9.5;Baxandall's Amplifier;114 9.6;The Baxandall 5 Watt Design;117 9.7;The Radford Valve Amplifiers;118 9.8;The Leak TL/12;119 9.9;The Mullard 5/10 and 5/20 Designs;119 9.10;The GEC Audio Amplifiers;120 9.11;The GEC 912 + Amplifier;122 9.12;Other GEC Audio Designs;123 9.13;The Brimar 25P1 Design;123 9.14;The Sonab Design;125 9.15;Increasing Available Output Power;126 9.16;Conclusions;128 10;Chapter 7. Solid State Voltage Amplifiers;130 10.1;Junction Transistors;130 10.2;Contr
ol of Operating Bias;132 10.3;Stage Gain;134 10.4;Basic Junction Transistor Circuit Configurations;135 10.5;Emitterfollower Systems;137 10.6;Thermal Dissipation Limits;139 10.7;Junction Field Effect Transistors (JFETs);140 10.8;Insulated Gate FETs (MOSFETs);144 10.9;Power BJTs vs. Power MOSFETs as Amplifier Output Devices;147 10.10;U and D MOSFETs;148 10.11;Useful Circuit Components;150 10.12;Circuit Oddments;151 10.13;Slew Rate Limiting;153 11;Chapter 8. Early Solid State Audio Amplifier Designs;154 11.1;The Lin Circuit;156 11.2;Quasi-complementary Output Stage Asymmetry;158 11.3;Listener Fatigue;161 11.4;Alternative Circuit Choices;163 11.5;Class A Operation;166 11.6;Fully Complementary Designs;169 11.7;Gain Stage Designs;171 11.8;HF Compensation Techniques;173 11.9;Symmetry in Circuit Layout and Slewing Rates;175 11.10;Stability of Output Current;176 12;Chapter 9. Contemporary Power Amplifier Designs;180 12.1;Remaining Design Problems;180 12.2;Power MOSFETs vs. Bipolar Junction Power Ttransistors (BJTs);181 12.3;Frequency Response of MOSFET Devices;182 12.4;MOSFET Linearity;184 12.5;gm Values for BJTs and MOSFETs;187 12.6;Quiescent Current Stability in Pushpull Output Systems;188 12.7;Other Iq Control Techniques;189 12.8;The Quad Current Dumping Amplifier;191 12.9;The Sandman Class S System;193 12.10;The Technics Class AA system;193 12.11;Voltage Amplifying Stage Gain and Overall THD;194 12.12;Basic Gain Stage Constructions;195 12.13;Output/Input Signal Isolation;199 12.14;Effect of NFB on Signal Distortion;200 12.15;Symmetry in Gain Block Structure;200 12.16;Negative Feedback and Sound Quality;201 12.17;Power Amplifier Output Stages;203 12.18;Output DC Offset Control;204 12.19;Hybrid Systems;206 12.20;Listening Trials;206 13;Chapter 10. Preamplifiers;210 13.1;Gramophone Record Replay Equalisation Characteristics;211 13.2;Replay Equalisation Circuitry;212 13.3;Practical Circuit Layouts;216 13.4;Very Low Noise Input Systems;219 13.5;Low Noise Devices;222 13.6;Head
room;225 13.7;Tone Controls and Filters;228 13.8;Signal Channel Switching and Remote Controls;231 13.9;Voltage Controlled Gain Systems;232 13.10;Digital Inputs;234 14;Chapter 11. Power Supplies;238 14.1;High Power Systems;238 14.2;Solid State Rectifiers;239 14.3;Music Power;242 14.4;Influence of Signal Type on Power Supply Design;242 14.5;High Current Power Supply Systems;243 14.6;Half-wave and Full-wave Rectification;244 14.7;DC Supply Line Ripple Rejection;245 14.8;Voltage Regulator Systems;245 14.9;Series Regulator Layouts;246 14.10;Over-current Protection;247 14.11;Integrated Circuit (Three Terminal) Voltage Regulator ICs;249 14.12;Typical Contemporary Commercial Practice;252 14.13;Battery Supplies;252 14.14;Switch-mode Power Supplies;254 15;Index;256


John Linsley Hood (1925-2004) was head of the electronics research laboratories at British cellophane, for nearly 25 years. He worked on many instrumentation projects including width gauges and moisture meters, and made several inventions which were patented under the Cellophane name. Prior to his work at British Cellophane he worked in the electronics laboratory of the Department of Atomic Energy at Sellafield, Cumbria. He studied at Reading University after serving in the military as a radar mechanic. Linsley Hood published more than 30 technical feature articles in Wireless World magazine and its later incarnation Electronics World. He also contributed to numerous magazines including Electronics Today.


'This book is the complete world guide to audio amps.'
Elektor Electronics
EAN: 9780080520414
Untertitel: 200:Adobe eBook. Sprache: Englisch. Dateigröße in MByte: 12.
Verlag: Elsevier Science
Erscheinungsdatum: November 1997
Seitenanzahl: 208 Seiten
Format: pdf eBook
Kopierschutz: Adobe DRM
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