audioXpress - May 2018

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It’s About the Sound 8 Exploring Master Quality Authenticated (Part 1) Measuring the Difference By Ron Tipton 14 Back EMF Phase Relationships in Moving-Coil Loudspeakers (Part 1) Identifying, Quantifying, and Modeling Back EMF By Andy Lewis 24 Acoustics in Performance Review by J. Martins 26 Schiit Audio’s High-Value Ideas By Oliver A. Masciarotte Oliver Masciarotte has an opportunity to sit down with Jason Stoddard, to discuss his company Schiit Audio, a high-value brand available at reasonable prices. 32 Transformers for Tube Amplifiers (Part 1) Transformer Basics By Gerhard Haas This article series explains the fundamental properties of transformers, examines the important criteria for rating and building a transformer, and analyzes how the transformer circuitry affects the overall result. 42 DIY Tube Amplifier Heat Management Options By Patrick Brunner Tube amplifiers generate the most heat per watt of audio output. Our author shares some methods to greatly increase the performance and the reliability of your DIY tube amplifier.
46 TubeSociety 2A3-300B SE Amplifier Project (Part 2) Saving the Best for Last By Menno van der Veen In the first part of this article series, Menno van der Veen described four 300B single-ended (SE) amplifiers that he built as prototypes for his students. Here, he describes the fifth and final amplifier, detailing the power supply section and the construction. Hollow-State Electronics 58 Comparing Output Waves of Tubes, FETs and BJTs By Richard Honeycutt