Modern High-end Valve Amplifiers: Based on Toroidal Output Transformers
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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About the author
Why Valve Amplifiers?
Output Transformer Specifications
The Output Transformer Valves and Loudspeaker
The Output Transformer in the Complex Domain
Theory of Overall Negative Feedback
Output Transformer LowFrequency Tuning
SingleEnded Toroidal Output Transformers
Valve Amplifiers using a Printed Circuit Board
Practical Aspects of Overall Negative Feedback
The UL40S Stereo Valve Amplifier
A Guitar Amplifier with a Toroidal Output Transformer
The VDV6AS7 The Maurits
Special Output Coupling Techniques
adjust amplification factor anode anode current anode voltage audio behaviour calculations capacitance capacitors cathode feedback cathode resistor Chapter characteristics chassis circuit board circuit diagram components connected control grid core damping factor dB frequency decade factor distortion effective example filament Formula frequency range frequency response ground points high frequency high voltage inductance Lp input internal resistance leakage inductance loudspeaker low frequencies maximum measured ohms output impedance output power output signal output valves overall negative feedback 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 shown in Figure shows single-ended sound speaker square wave standby switch supply voltage taps toroidal output transformers toroidal transformers transfer function trimpot triode mode tuning factor ultralinear mode valve amplifier Vanderveen Vg2k watts wires