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Jan 28, 2026 | 0 comments

The 3A5 Tube Line Preamplifier

Published by IWISTAO Circuit Topology, Operating Point & Load Line Analysis 1. Introduction The 3A5 (sometimes referred to as type 345 in early documentation) is a 7-pin, double directly heated...

Jan 27, 2026 | 0 comments

LS3/5A Crossover Network Analysis: The Evolution of 15Ω a...

Published by IWISTAO Abstract The BBC LS3/5A is not simply a compact loudspeaker, but a precision monitoring instrument. Its legendary status owes far more to its crossover network than to...

Jan 22, 2026 | 0 comments

The Ultimate Guide to Essential Audio Cables: 3.5mm, XLR,...

Published by IWISTAO In the world of audio, cables are the unsung heroes. They are the critical pathways that carry sound from your source to your ears, and choosing the...

LS3/5A Acoustic Damping Felt for 1 Pair Cabinets- Premium Speaker Cabinet Dampening Material

Jan 20, 2026 | 0 comments

LS3/5A Cabinet Acoustic Damping: Application, Engineering...

Published by IWISTAO Engineering Notes on Internal Cabinet Damping 1. Purpose of Application The internal acoustic damping material forms an integral part of the LS3/5A enclosure alignment. Its primary purposes...

Jan 19, 2026 | 0 comments

My LS3/5A Journey

Published by IWISTAO Immersed reading—like disappearing into a novel. When it comes to hi-fi, the British BBC LS3/5A is a hurdle almost no audiophile can avoid. If you try to...

Jan 17, 2026 | 0 comments

EL34 Bias Adjustment Guide (SE and PP)

Published by IWISTAO Single-Ended (SE) and Push-Pull (PP) Tube Amplifiers Bias adjustment is one of the most critical procedures in tube amplifier setup. In real-world engineering practice, incorrect bias accounts...

Jan 14, 2026 | 0 comments

Radio and the Emergence of a Synchronized World

Published by IWISTAO Prior to the development of radio, human societies did not share a unified temporal experience. Information circulated through letters, newspapers, and telegraph networks, each constrained by physical...

Jan 12, 2026 | 0 comments

LS3/5A and Tube Amplifiers: A Practical Matching Experience

Published by IWISTAO Why LS3/5A is often described as “not happy without tubes,” and what really makes the pairing work. 1. Understanding the Nature of the LS3/5A The BBC LS3/5A...

Jan 10, 2026 | 0 comments

The Role of 75-Ohm Coaxial Cable in Hi-Fi Audio Systems

Published by IWISTAO In high-fidelity audio systems, signal integrity is just as important as circuit topology, component quality, or power-supply design. Among all interconnect options, 75-ohm coaxial cable holds...

Jan 08, 2026 | 0 comments

Grounding Design for EL34 Single-Ended Tube Amplifiers

Published by IWISTAO In real-world DIY and small-scale production experience, nearly 80% of first power-up failures in EL34 single-ended (SE) tube amplifiers are caused by incorrect grounding implementation, not by...

Jan 07, 2026 | 0 comments

DIY Tube Amplifier Testing and Adjustment --A Practical E...

Published by IWISTAO Building a DIY tube amplifier is never just about getting sound. True performance, reliability, and tube longevity depend on systematic testing and precise adjustment. Improper setup may lead...

Jan 06, 2026 | 0 comments

Overshoot and Ringing in Tube Amplifiers--Causes, Detecti...

Published by IWISTAO Introduction In tube amplifiers, overshoot and ringing are common distortion or instability phenomena. They are typically caused by excessive feedback gain or deficiencies in output transformer design. These...

Jan 06, 2026 | 0 comments

Understanding Output Waveform Distortion in Tube Amplifiers

Published by IWISTAO Oscilloscope-Based Diagnosis and Adjustment Guide Introduction In tube (valve) amplifier design and debugging, the oscilloscope remains one of the most powerful diagnostic tools. By observing how a...

Jan 05, 2026 | 0 comments

A Comprehensive Guide to Audio Power Amplifier Design

Published by IWISTAO The audio power amplifier is the heart of any high-fidelity sound system. It performs the critical task of taking a low-power audio signal from a source like...

Jan 04, 2026 | 0 comments

The Enduring Legacy of the 1969 JLH Class A Amplifier

Published by IWISTAO Introduction: A Landmark in Hi-Fi History In the annals of high-fidelity audio, few designs have achieved the legendary status and enduring popularity of the 1969 Class A...

Jan 03, 2026 | 0 comments

Building a High-Performance FM Tuner: A Deep Dive into a ...

Published by IWISTAO Introduction In an age of streaming services and digital audio, there remains a unique and enduring magic to FM radio. The thrill of tuning across the dial,...

Dec 30, 2025 | 0 comments

The Ultimate Guide to Subwoofer Port Tuning for Deep, Pow...

Published by IWISTAO If you've ever been captivated by the deep, resonant bass in a high-end audio system and wondered how to replicate that immersive experience, the secret often...

Dec 25, 2025 | 0 comments

Designing a 40 Hz Transmission Line Loudspeaker

Published by IWISTAO An Engineering Case Study Using the Markaudio CHN-110 Transmission Line (TL) loudspeaker enclosures are widely regarded for their ability to extend low-frequency response while preserving transient accuracy...