Modern High-end Valve Amplifiers: Based on Toroidal Output Transformers

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Elektor International Media, 1999 - Всего страниц: 250
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 the apparent simplicity. These are discussed extensively, in connection with designs for amplifiers without 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.
 

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Содержание

About the author
xiii
Why Valve Amplifiers?
7
Output Transformer Specifications
19
The Output Transformer Valves and Loudspeaker
29
The Output Transformer in the Complex Domain
43
FrequencyDomain Calculations
51
Theory of Overall Negative Feedback
67
Output Transformer LowFrequency Tuning
79
SingleEnded Toroidal Output Transformers
113
Construction Hints
161
Valve Amplifiers using a Printed Circuit Board
173
Practical Aspects of Overall Negative Feedback
183
The UL40S Stereo Valve Amplifier
197
A Guitar Amplifier with a Toroidal Output Transformer
213
The VDV6AS7 The Maurits
239
Appendix
247

Special Output Coupling Techniques
93

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