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May 21, 2026 | 0 comments

Fostex FE108-Sol vs FE126En: A Detailed Full-Range Driver...

Published by iwistao · DIY Audio / Full-Range Drivers Comparing Fostex's limited-edition Sol-series 4-inch driver against the popular 4.7-inch FE126En — two ES-cone full-range drivers with different philosophies, for different...

May 14, 2026 | 0 comments

Vacuum Tube FM Radio IF Amplifiers: Understanding the 10....

Published by iwistao · Vacuum Tube Electronics A technical deep-dive into the design, operation, and circuit topology of vacuum tube intermediate frequency amplifiers in FM receivers. In a vacuum tube...

May 12, 2026 | 0 comments

Fender Tube Guitar Amplifiers: The Complete Guide to Circ...

Published by IWISTAO Few pieces of music equipment carry the cultural weight of a Fender tube amplifier. From the intimate warmth of a Princeton to the stadium-filling roar of a...

May 08, 2026 | 0 comments

EL34 vs 300B: A Comprehensive Technical Comparison for Hi...

Published by iwistao · HiFi & Tube Amplifiers One is the versatile pentode workhorse that powered generations of guitar and HiFi amplifiers. The other is the legendary directly-heated triode revered...

May 04, 2026 | 0 comments

DIY 4-Inch Full-Range Transmission Line Speaker: A Comple...

pUBLISHED BY IWSITAO · DIY Audio · Speaker Building How to build a back-folded labyrinth enclosure for a Markaudio 4-inch driver — a complete materials breakdown, step-by-step build guidance, hands-on...

Apr 26, 2026 | 0 comments

Vacuum Tube FM Tuner Front End: The Complete Technical Guide

Published by IWISTAO | Hi-Fi Audio | Vintage Audio Technology The vacuum tube FM tuner occupies a unique and revered position in the history of high-fidelity audio. Born in the...

Apr 25, 2026 | 0 comments

6N3 and 6N1 Vacuum Tube FM Tuner Front End: A Complete Te...

Published by IWISTAO | Hi-Fi Audio | Tube FM Technology | v1.0 A selection of vacuum tubes representative of those used in vintage FM receiver front ends. The 6N3 and...

Apr 23, 2026 | 0 comments

Bluetooth DAC Explained: How It Works, Codecs, and Hi-Fi ...

Published by IWISTAO · Audio Technology · 18 min read · Table of Contents What Is a Bluetooth DAC? How It Works: The Signal Chain Bluetooth Audio Codecs In Depth Codec...

Apr 22, 2026 | 0 comments

Tube Buffer Preamplifier: The Complete Guide for Audiophi...

Published by IWISTAO Table of Contents What Is a Tube Buffer Preamplifier? Why Use a Tube Buffer? Benefits and Trade-offs How It Works: The Cathode Follower Explained Circuit Topologies: CF,...

Apr 21, 2026 | 0 comments

Upgrading a Vintage Tube Radio to Stereo with the LA3401 ...

Published by IWISTAO Table of Contents Introduction Why Vintage Tube Radios Are Mono FM Stereo Multiplexing: A Quick Primer Meet the LA3401: A Purpose-Built PLL MPX Decoder Internal Architecture of...

Apr 19, 2026 | 0 comments

Passive Preamplifiers and Step-Up Transformers: The Compl...

Published by IWISTAO In the world of high-fidelity audio, the signal chain from stylus to speaker is everything. Yet few components are as misunderstood — or as quietly transformative —...

Apr 15, 2026 | 0 comments

The Complete Phono Cable Guide: MM vs MC, Capacitance and...

Vinyl Audio Published by IWISTAO Capacitance, shielding, conductor materials, and connectors — everything that matters between your tonearm and phono stage Hi-Fi & Vinyl · In-depth Technical Guide ·...

Apr 11, 2026 | 0 comments

The Complete Guide to Vinyl Phono Tonearms: Design, Geome...

Published by IWISTAO An in-depth technical exploration of tonearm types, alignment principles, bearing systems, resonance matching, and step-by-step setup for audiophile-grade vinyl playback The tonearm is the mechanical heart of...

Apr 06, 2026 | 0 comments

The Complete Guide to Phono Preamps: Unlocking the Full P...

Published by IWISTAO Understanding RIAA Equalization, Circuit Design, Cartridge Matching, and Real-World Design Trade-Offs for High-Performance Vinyl Playback. A phono preamplifier (phono stage) is one of the most critical...

Apr 04, 2026 | 0 comments

Inside the Phono Cartridge: Why MM and MC Use Different G...

Published by IWISTAO For many people entering the world of vinyl playback, one question appears almost immediately: if two turntables both play records, why does one cost only a few...

Apr 02, 2026 | 0 comments

DIY 300B SET Stereo Amplifier: Circuit Design, Parts List...

Published by IWISTAO 🏷 DIY Audio · Tube Amplifiers · 300B · Stereo SET Hi-Fi Table of Contents Introduction — The Legend of the 300B SET Amplifier Theory & Class...

Mar 28, 2026 | 0 comments

Soft Start and Delayed B+ Power-Up Circuits for Vacuum Tu...

Published by IWISTAO Table of Contents Introduction — Why Soft Start Matters What Happens at Power-On Types of Soft Start Circuits NTC Thermistor Inrush Limiter Relay Timer Delay Board B+...

Mar 25, 2026 | 0 comments

The Complete DIY Transistor Power Amplifier Guide: Class ...

Published by IWISTAO INPUT SIGNAL TRANSISTOR POWER AMPLIFIER ×20 OUTPUT SIGNAL ±45 V DC Power Supply Fig. 0 — Conceptual overview of a transistor power amplifier: a small audio input...