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In this issue

8 RødeTest FuzzMeasure Audio and Acoustic Measurement Software A Classy “Swiss Army Knife” for Acoustic Measuring By Luke McCready The FuzzMeasure acoustic measurement software is known for its high-quality graphs and for tucking an immense amount of control into a sleek, minimal interface. 20 Stop Worrying About Coupling Capacitors! By Ethan Winer Ethan built a simple device that measures capacitor distortion using a USB sound card and free software to try and determine the importance of high-quality capacitors in the signal path. 30 Noise Analysis for FDA-Based Audio ADC Drivers By Michael Steffes 34 Build This MoFo! By Mike Rothacher Mike Rothacher dreamed of a simple DIY amplifier project—an inexpensive, single-stage, single-ended, Class A. He also wanted a MOSFET Follower (MoFo), powered by a simple laptop adaptor. 42 In Memoriam of Gerhard Haas 44 Repurposing an Old Preamp for Line-Level Duty By Bill Reeve Bill Reeve builds a tube preamplifier to position at the input to his home power amplifier, eliminating the need to adjust his 1972 McIntosh MX10 tuner and 240 power amplifier’s volume high when he wants to fill his home with music. 50 Mini Blocks—Small Vacuum Tube Power Amplifiers By Bruce Heran This latest incarnation of that amplifier is actually a pair of mini blocks as they better suit his current needs and include a number of modifications that enhance their performance. 56 Powering Your Circuits (Part 4) AC Rectification and DC Power Regulation By Ed Simon In this article, Ed Simon continues to explore AC waveforms and looks at full-wave bridge (FWB) circuits and other forms of DC power regulation. 60 Adventures in Guitar Amplifier Repair By Richard Honeycutt

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