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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...

Mar 20, 2026 | 0 comments

The Complete Guide to Speaker Protection Circuits

Published by IWISTAO How DC offset detection, relay muting, thermal cutoff, and soft-start logic work together to keep your precious drivers alive — with schematics, theory, component selection, PCB tips,...

Mar 19, 2026 | 0 comments

How to Choose the Right Output Transformer Impedance

Published by IWISTAO A practical, no-nonsense guide to matching primary impedance, calculating turns ratio, and selecting the correct output transformer for your vacuum-tube amplifier build. If you have ever...

Mar 18, 2026 | 0 comments

Winding Your Own Filter Choke for Tube Amplifiers-A More ...

Published by IWISTAO From first principles to a finished component — how to design, wind, assemble, and verify a high-quality choke for tube-amplifier power supplies and related high-voltage circuits. Table...

Mar 18, 2026 | 0 comments

Output Transformers in Vacuum Tube Push-Pull Amplifiers--...

Published by IWISTAO A comprehensive technical guide for audiophiles and DIY amp builders If you have ever opened a vintage vacuum tube amplifier—whether a Dynaco ST-70, a Marantz Model 8B,...

Mar 16, 2026 | 0 comments

Single-Ended Output Transformers Core Size, DC Bias, and ...

Published by IWISTAO A blog-form technical guide for builders of single-ended triode and pentode amplifiers Figure 1. Why single-ended transformers must deal with continuous one-way DC flux while push-pull cores...

Mar 12, 2026 | 0 comments

Principles and Design Analysis of Electroacoustic Convers...

Published by IWISTAO Speakers are indispensable components in audio systems, and their performance directly determines sound reproduction quality and listening experience. Among common speaker types, moving-coil loudspeakers are the most...

Mar 08, 2026 | 0 comments

Software Defined Radio (SDR): A Complete Practical Guide ...

Published by IWISTAO A comprehensive guide covering what SDR is, how it works, why I/Q sampling matters, how the Malahit DSP SDR V3 fits into modern radio listening, and how...

Mar 07, 2026 | 0 comments

MLA-30 Loop Antenna Setup: Why Installation Matters More ...

Shortwave / SDR / Antenna Guide Published by IWISTAO A detailed practical guide to getting the best real-world performance from the MLA-30 active loop antenna, with a focus on noise...

Mar 06, 2026 | 0 comments

How to Improve Shortwave Reception on the Malahit DSP SDR V3

Published by IWISTAO The Malahit DSP SDR V3 is one of the most powerful portable SDR receivers available today. With wide frequency coverage, DSP filtering, and spectrum display, it can...

Mar 05, 2026 | 0 comments

The Science of Speaker Isolation Spikes

Published by IWISTAO How tiny metal cones beneath your speakers can transform muddy vibrations into crystalline sound — and why physics demands them. Every speaker vibrates. That's the point —...

Mar 03, 2026 | 0 comments

The History of HiFi Audio: A Journey Through Sonic Excell...

Published by IWISTAO Introduction High Fidelity, or "HiFi," represents the pursuit of audio reproduction that stays true to the original sound. From the scratchy beginnings of mechanical phonographs to today's...

Feb 26, 2026 | 0 comments

OPT vs. OTL: The Two Defining Philosophies in Hi-Fi Tube ...

Published by IWISTAO In high-fidelity audio, the debate between OPT (Output Transformer) and OTL (Output Transformer-Less) tube amplifiers has existed for decades. Both are vacuum tube amplifiers. Both promise musicality...

Feb 25, 2026 | 0 comments

12AX7 vs 12AX7B: What’s the Difference—and Which One Is B...

Published by IWISTAO In the world of vacuum tube Hi-Fi, few small-signal tubes are as influential as the 12AX7. From line preamps to phono stages and driver sections, it remains...