Glass Audio 1997 Issue 3 (of 6)

1997 Issue 3 (of 6) of Glass Audio - in PDF format

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• Transformer-Coupled SE Amp Revisited – Return to the source of the American single-ended revolution. Renowned designer Nobu Shishido revisits his groundbreaking 1994 work with an improved circuit that eliminates coupling capacitors and introduces lower-cost transformer alternatives from Japan, proving that "empirical" design can lead to sonic perfection.
• Optimizing the 2A3 Performance – Master the iconic 2A3 triode through real-time spectral analysis. Donald Jenkins reveals an elaborate procedure for finding the exact "dynamic" operating point required to achieve absolute minimum distortion, proving that even legendary vintage tubes have hidden performance depths.
• Simple Gain Circuits – Build your technical foundation with an exclusive excerpt from Bruce Rozenblit’s Beginner’s Guide to Tube Audio Design. This guide demystifies the design process for triode and pentode voltage amplifiers, helping you navigate the critical trade-offs between gain, bandwidth, and impedance.
• A Battery Tube Hi-Fi Amplifier – High performance doesn't have to mean high voltage. Larry Lisle presents a safe, battery-powered SE project that eliminates hum and noise while delivering "first-class" triode sound with less than 1% distortion—the ideal starting point for the "squeamish" novice.
• SE Amplifier Output Impedance – Solve the mystery of why single-ended amps sound so remarkably natural. Eduardo de Lima explores the complex interface between high output impedance and loudspeakers, revealing how this unique "modulation" of the frequency response can actually enhance midrange transparency.
• Glass Shard: Transformer Phase Inverter – Stop front-end oscillations before they start. Chris Wolf shares a clever "cost-be-damned" solution using an interstage transformer to replace problematic split-load phase inverters in high-power triode projects.
• Vintage Glass: Eico HF20 Amplifier – Take a deep dive into the architecture of a golden-era classic. This issue includes a comprehensive schematic and detailed parts list for the venerable Eico HF20.