audioXpress - May 2025

In this issue

FROM THE EDITOR’S DESK—Learn About the Music You Like, by J. Martins, p. 4
78 rpm Returns, by Michael Harkins, p. 8
The Ultra-Linear Power Amplifier: An Adventure Between Triode and Pentode, by Rudolf Moers, p. 16
Getting Less Gain from Tubes, by Merlin Blencowe, p. 28
Micro Details in Push-Pull Output Transformers, by Hans Polak, p. 30
Type 3 Mu Stage Breakthrough, by Alan Kimmel, p. 37
Prototyping Alan Kimmel’s Mu3 Stage, by Kim Bond, p. 41
Anomalies V2: Leaving the Trodden Speaker Path, by Ben (Wolf) Shaffer, p. 44
Coffee Can Towers, by Ken Bird, p. 50
A Primer on Class-D Amplifiers: Part 2—Practical Implementations, by Paul Marchese, p. 57
HOLLOW-STATE ELECTRONICS—Do It Yourself with Tubes, by Richard Honeycutt, p. 62

audioXpress Magazine Description:

Step into the realm of audio, sound technology, and the latest developments in the field with audioXpress Magazine. We're delighted to introduce you to this publication, your ultimate source for all things related to audio, audio equipment, and the art of sound reproduction.

audioXpress Magazine, published by KCK Media Corp., is not just a magazine; it's your portal to the world of audio and sound technology.

As you explore the pages of audioXpress Magazine, you'll find a world of content that celebrates the magic of sound and audio technology:

* Audio Equipment: Dive into the world of audio gear, equipment reviews, and the latest advancements in the industry.
* Sound Technology: Explore the science of sound, audio engineering techniques, and the art of sound reproduction.
* DIY Audio: Learn about do-it-yourself audio projects, audio kits, and tips for crafting your own sound systems.
* Industry Insights: Stay informed about the latest trends, innovations, and news in the audio and sound technology field.
* Music and Sound: Immerse yourself in the world of music, audio production, and the stories of sound enthusiasts.


audioXpress Magazine is your essential resource for celebrating the magic of sound, understanding audio technology, and connecting with a community that values the science and art of sound. Subscribe now and become part of a community that appreciates the power of sound and music.