Modern High-end Valve Amplifiers

Modern High-end Valve Amplifiers

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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.20.2 The audio circuit Figure 20.1 shows the circuit diagram of the amplifier. This is only the left channel. The stereo amplifier utilizes three dual triodes for the drivers, plus one 6AS7 power valve per channel, for a total of five valves. The 6AS7anbsp;...

Title:Modern High-end Valve Amplifiers
Author:Menno van der Veen
Publisher:Elektor International Media - 1999


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