By Morgan Jones
Development Valve Amplifiers is a distinct hands-on consultant for an individual operating with tube audio equipment--as an electronics hobbyist, audiophile or audio engineer. This second variation builds at the luck of the 1st with know-how and approach revisions all through and, considerably, an incredible new self-build venture, labored via step by step, which places into perform the rules and methods brought during the book.
Particular cognizance has been paid to answering questions frequently asked via rookies to the area of the valve, even if audio lovers tackling their first construct or more matured amplifier designers trying to know about the layout ideas and trade-offs of «glass audio.» defense concerns are constantly to the fore, and the sensible part of this publication is strengthened via various transparent illustrations throughout.
- the one hands-on method of development valve and tube amps--classic and modern--with at least theory
- layout, development, fault-finding, and checking out are all illustrated via step by step examples, allowing readers to obviously comprehend the content material and achieve their very own projects
- features a whole self-build amplifier undertaking, placing into perform the most important options brought in the course of the booklet
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Additional resources for Building Valve Amplifiers
The major items to be positioned are: Mains transformer Output transformer Rectifier valve HT reservoir capacitor Output valves Driver circuitry. Although negative feedback reduces hum, it would be best if there were no hum induced into the output transformer from the mains transformer; we draw a line between the centres of the two transformers, and rotate them so that their coils are at 90 to each other to minimise hum. 28. We can also reduce induced hum by moving the two transformers apart. As soon as we separate major parts, we ought to think about whether we can use the space in between them, perhaps for the reservoir capacitor.
The place for the input selector switch is on a bracket at the back of the pre-amplifier, sufficiently close to the input sockets that unscreened wire from each socket to switch contacts does not pick up interference. The output of the selector switch feeds the volume control, so the obvious position is nearby, but it is often best positioned diagonally opposite because this minimises lead length (and therefore shunt capacitance) from the output of the control. 37. 37 Pre-amplifier layout. The layout assumes a right-handed operator, so you might want to mirror it if you are belligerently left-handed.
As can be seen from the diagram, the screen diverts interference currents from the source to earth. If there is an impedance between the screen and radio frequency earth, the interference current must develop a voltage across it, allowing the screen to capacitively couple interference to its enclosed (sensitive) circuitry. 15 McMurdo B9A sockets position the heater pins (4, 5) close to the edge of the chassis provided that the mounting holes are at a 45 angle to the edge. 16 Screening breaks one capacitance into two, centre-tapped by an earth.