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Oct 13, 2026 | 0 comments

How to Choose Audio Power Amplifier Chassis

Published by iwistao · Audio Engineering · V1.3 A practical guide to dimensions, transformer support, ventilation, heat sinks, grounding, and service access. Choose an amplifier chassis around the circuit, its...

Jul 04, 2026 | 0 comments

The 6N2 + Dual-FU19 Vacuum Tube Headphone Amplifier: A Te...

Published by iwistao · Hi-Fi Audio How a 1950s VHF transmitter tube found a second life as one of the most compelling DIY headphone amplifier projects in the audiophile world...

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 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...

Feb 19, 2026 | 0 comments

ECL86 (6GW8) Vacuum Tube: The Complete Guide for Hi-Fi Bu...

Published by IWISTAO The ECL86 is one of the most practical all-in-one audio tubes ever designed. It integrates a triode voltage amplifier and a power pentode output stage within a...

Feb 03, 2026 | 0 comments

A Tale of Two Rectifiers: A Deep Dive into the 6X5GT and ...

Published by IWISTAO In the world of vintage electronics and modern audiophile equipment, the power supply is the unsung hero. It is the foundation upon which the entire performance of...

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 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...