By Morgan Jones
Construction Valve Amplifiers is a special hands-on consultant for somebody operating with tube audio equipment--as an electronics hobbyist, audiophile or audio engineer. This 2d version builds at the good fortune of the 1st with know-how and process revisions all through and, considerably, an incredible new self-build undertaking, 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 by means of beginners to the realm of the valve, even if audio fans tackling their first construct or more matured amplifier designers trying to know about the layout rules and trade-offs of «glass audio.» safeguard concerns are continually to the fore, and the sensible facet of this e-book is bolstered via a variety of transparent illustrations throughout.
- the one hands-on method of construction valve and tube amps--classic and modern--with not less than theory
- layout, development, fault-finding, and checking out are all illustrated by way of step by step examples, allowing readers to obviously comprehend the content material and achieve their very own projects
- encompasses a whole self-build amplifier undertaking, placing into perform the main strategies brought during the e-book
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Additional info for Building Valve Amplifiers
E. Zepler, The Technique of Radio Design. Chapman & Hall (1943). 60 Examples Although general, seventy pages over three chapters (“The Principles of Screening”, “Undesired Feedback”, and “Hum, Spurious Beats”) tackle valve-specific problems and make this little book well worth searching out. G. Scroggie, Foundations of wireless (and Electronics), 7th edn. Iliffe. Accessibly written for the amateur, any edition of this book is worth reading for useful radio frequency hints and tips that can be subverted for audio use.
W. Ott, Noise Reduction Techniques In Electronic Systems, 2nd edn. Wiley (1988), ISBN 0-471-85068-3. Slightly misnamed (its main focus is interference reduction), this was one of the first books to formally cover EMC and is still one of the best. J. Goedbloed, Electromagnetic Compatibility (Phillips Research Laboratories). Prentice-Hall (1990), ISBN 0-13-249293-8. Given that Philips was a component manufacturer at the time, this excellent book contains plenty of theoretical considerations for component design and usage backed up by measurements.
If the output valves are widely spaced, even if the output transformer’s coil axis is pointed away from them, they are likely to be in the leakage field from the edges of the coil. A separation of one envelope diameter between output transformer and valve significantly reduces the localised flux leakage from the edges of the coil. This generalisation works because larger valves produce higher power and require a larger transformer. Beam valves such as KT66 having aligned grids to reduce screen grid current are particularly sensitive to magnetic fields, so even greater spacing might be desirable to avoid modulating screen grid current and causing distortion.
Building Valve Amplifiers by Morgan Jones