Valve Amplifiers, Fourth Edition
Format: PDF / Kindle (mobi) / ePub
Valve Amplifiers has been recognized as the most comprehensive guide to valve amplifier design, analysis, modification and maintenance. It provides a detailed presentation of the rudiments of electronics and valve design for engineers and non-experts. The source also covers design principles and construction techniques to help end users build their own tool from scratch designs that work. The author's approach walks the reader through each step of designing and constructing, starting with an overview of the essential working principles of valve amplifiers, the simple and complex stages, the process of linking the stages, and completing the design.
The book is comprised of seven chapters all of which include a DIY guide discussion of practical aspects. The text starts with familiarization of the fundamentals of electronics, which are essential for designing and building valve amplifiers. Particular attention has been paid to providing solutions for questions that are commonly asked and faced by beginners in valve designing and construction.
Valve Amplifiers is a masterful hands-on guide for both experts and novices who work with tube audio equipment, and for electronic hobbyists, audio engineers, and audiophiles.
* The practical guide to analysis, modification, design, construction and maintenance of valve amplifiers
* The fully up-to-date approach to valve electronics
* Essential reading for audio designers and music and electronics enthusiasts alike
interference via the inter-winding capacitance of a mains transformer, even if that capacitance would be divided down by a transistor’s hfe. The safest solution is to use a THINGY configured for 40 V and 270 V and feed it from the raw supply before the regulator so that any mains interference that does manage to crawl back through the THINGY can be attenuated 100 dB by the statistical regulator. HT Rectification and Smoothing (a PSUD2 Exercise) We require 390 V, and we need at least 20 V
core silver threaded down a polytetrafluoroethylene (PTFE) sheath, covered with a braid electrostatic screen. Both cables are then threaded down one overall braid screen, which also serves to hold the cables together. The braid must not have voids, so domestic aerial cable is unsuitable; broadcast quality video cable and multicore umbilical cable are both ideal sources of non-voided braid. Once the plastic outer sheath has been removed, the braid easily concertinas off the inner conductors.
stuff and difficult to strip without damaging the internal conductors, although the specialist adjustable wire strippers having calibrated settings down to 0.25 mm are very effective. Leave well alone unless you really are competent with such fine wire, and beware that it becomes brittle with age. Balanced wiring is particularly beneficial for moving coil cartridges, and even helps hum rejection when the pre-amplifier is unbalanced. RIAA Stage Design The RIAA stage has to satisfy so many
has g m =105 mA/V, so the gain to the cathode is ≈130. A good fit to the published SSM2210 curves of C cb against V cb can be obtained using: Note that this equation has no physical significance – it just provides a good fit. Knowing C cb and gain to the cathode, we can calculate Miller capacitance. From the E88CC curves, if V a =90 V and I a =3 mA, V gk ≈−2.6 V, so if the grid is not elevated, V cb =2.6 V, resulting in C in =2,760 pF. Both halves of the differential pair have this
whilst high capacitance per unit volume capacitors are at the top of the tree. This can be further generalised by observing that high quality capacitors tend to be physically large for their value of capacitance. Air Dielectric, Metal Plate ( εr≈1) These capacitors are invariably constructed as trimmer or variable capacitors with sets of intermeshing semicircular rigid plates and are primarily used in radio frequency (RF) circuits, although they are occasionally useful in audio. Because of