Modern High-end Valve Amplifiers: Based on Toroidal Output TransformersElektor 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. |
Содержание
Output Transformer Specifications | 15 |
The Output Transformer Valves and Loudspeaker | 29 |
The Output Transformer in the Complex Domain | 43 |
FrequencyDomain Calculations | 51 |
Frequency decade factor examples | 62 |
Output Transformer LowFrequency Tuning | 79 |
Special Output Coupling Techniques | 93 |
SingleEnded Toroidal Output Transformers | 113 |
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 VDV100 Power Amplifier | 219 |
The VDV6AS7 The Maurits | 239 |
247 | |
Construction Hints | 161 |
Часто встречающиеся слова и выражения
adjust Amplimo anode anode current audio behaviour buro Vanderveen calculations capacitors cathode feedback cathode resistor Chapter characteristics chassis circuit board circuit diagram components configuration connected control grid core damping factor dB frequency decade factor distortion effective filament Formula frequency range frequency response ground points high frequency high voltage inductance Lsp input internal resistance leakage inductance loudspeaker low frequencies maximum measured negative feedback ohms output impedance output power output signal output valves overall negative feedback pentode pentode mode phase splitter power supply power valves preamplifier primary impedance primary inductance primary winding printed circuit board Q factor quiescent current resistor screen grid secondary impedance secondary winding shown in Figure shows single-ended sound speaker supply voltage taps toroidal output transformers transfer function trimpot triode mode tuning factor ultralinear mode valve amplifier Vg2k watts wires Zout