Glass Audio 1997 Issue 4 (of 6)

1997 Issue 4 (of 6) of Glass Audio - in PDF format

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Experience the perfect blend of technical measurement and subjective listening with Volume 9, Number 4 of Glass Audio (1997). This issue provides a deep dive into the following featured articles and projects:

• Sound of the Machine: The Hidden Harmonics Behind THD – Professional speaker designer Lynn Olson and Matt Kamna of Tektronix use elaborate spectrum analysis to reveal why traditional total harmonic distortion (THD) measurements often fail to reflect what we actually hear. Discover how "hidden" patterns of even and odd harmonics define the unique sonic signature of various tube circuits.
• High-Performance Tubed DAC Output Stage, Part 2 – Jukka Tolonen moves from simulation to practice, delivering a complete, workable design for a tubed output stage to replace semiconductor stages in existing CD players. This installment includes a printed circuit board layout, regulated power supplies, and construction details for a smooth-sounding amplifier.
• SPICE and the Art of Preamp Design, Part 2 – Norman Koren concludes his study on using computer modeling to demystify high-end design. This part focuses on line-amplifier versions, exploring the pros and cons of tone controls and demonstrating how SPICE can achieve nearly perfect frequency response while taming RF interference.
• A WWII “VT”/Generic Conversion Tube Chart – Decipher the military’s secret codes with Frederick Seitz's essential conversion chart. Whether you've found "gold" at a garage sale or have a stash of vintage surplus, this guide links military "VT" numbers to their usable modern equivalents.
• Guest Editorial: The Impedance Wars – André Jute explores the "bitter battle" over load impedance and the controversy surrounding tapped output transformers. He urges designers to look past established dogmas and keep an open mind to achieve better sound quality.
• Glass Shard: Ye Olde Test Mule – Stop letting your spare parts gather dust! Chris Wolf provides a guide for building a permanent tube-type test mule, turning your collection of extras into a versatile bench tool for testing new circuits without the need for constant fabbing.

CONTENTS

Volume 9 Number 4 (1997)

Note: Page numbers are based on the table of contents provided in the source.