audioXpress May 2026 PDF

Issue 5
May 2026

• FROM THE EDITOR’S DESK—Hear No Evil, by J. Martins, p. 4
  

• Designing the Dynaco ST-70 Series 3 Vacuum Tube Audio Power Amplifier, by Dan Fraser, p. 8
  

• The Yin & Yang Circuit, by Geert Oyen, p. 14
  Stabilizing Tube Feedback Amplifiers Without Much Math: Part 1—Diagnostic

• Principles, by Merlin Blencowe, p. 22
  

• Rediscovering the EF184: A Surprising MM RIAA Preamplifier, by Zoran Dukick, p. 30

• Building a KT170 Class-A Amplifier, by James Skov, p. 36
  

• Thoughts on Igor Popovich’s Audiophile Vacuum Tube Amplifiers Books, by Mark Driedger, p. 44
  

• Revisiting an Elegant Idea: The Augmented Follower, by Dimitri Danyuk, p. 48
  

• New Expressions for First-Order Filter Phase Response and Group Delay: Part 2—Deriving Responses and Group Delays, by Barak Shpiez, p. 54
  

• HOLLOW-STATE ELECTRONICS—Hermon Hosmer Scott: A Visionary, Engineer, and Entrepreneur, by Richard Honeycutt, p.63