Glass Audio 1997 Issue 1 (of 6)

1997 Issue 1 (of 6) of Glass Audio - in PDF format

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Experience the cutting edge of high-power engineering and precision measurement with Volume 9, Number 1 of Glass Audio (1997). This issue features groundbreaking projects and essential technical theory for the serious tube enthusiast:

• The 4-250A Beam Tetrode Power Amplifier – Harness the power of heavy-duty industrial transmitting tubes with Michael A. Burrows' ambitious 175W per channel design. Combining rugged reliability with sophisticated protection circuits—including a custom cool-down cycle—this amplifier is a masterpiece of art and sound efficiency.
• Distortion in Tubes: Small-Signal Pentodes – Master the complexities of pentode operation with Rickard Berglund’s detailed measurement study. Learn how to find the "isodistortion point" and use specific screen-grid adjustments to virtually eliminate third-harmonic distortion.
• A Differential Line Amp with Tubes – High-end designer Erno Borbely delivers a high-quality balanced line amplifier and driver using ECC83 and ECC81 tubes. Explore a topology that offers excellent linearity, rejection of common-mode noise, and the ability to drive just about any power amplifier, including solid-state designs.
• The Search for Linearity, Part 2 – Mark Kelly continues his deep dive into the math behind perfect audio, focusing this time on active anode loads. Discover the benefits of the SRPP, mu follower, and "inverted cascode load" for maximizing stage gain while maintaining strict linearity.
• Vacuum Tube Electronics: Part 3—Circuit Theory – Expand your technical library with Scott Frankland’s annotated guide to the essential post-WWII texts on electric circuit theory. This installment focuses on mastering network analysis, pole-zero theory, and determining transient response.
• Showcase: A Vacuum Tube Preamplifier – Get inspired by Rick Spencer’s stunningly crafted preamp, featuring a unique see-through smoked plastic front panel. Pairing the beauty of glowing valves with high-end components, this unit delivers professional looks and "Daniel" series performance.
• Guest Editorial: You Make Your Pick, I'll Make Mine – Signal processing engineer Greg Berchin offers a refreshingly direct defense of tube audio. Challenging the "missionary zeal" of measurement fanatics, he argues that subjective perception is the only metric that truly matters for an audiophile.

CONTENTS

Volume 9, Number 1 (1997)