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All items in category Project Articles.

September 13, by Bob McIntyre. In this classical tube amplifier project, author Bob McIntyre offers what is effectively the foundation for many designs that we can find currently in the market.

This is not surprising. The Mighty Mouse is indeed a good sounding and inexpensive project that is also a good introduction to tube amplification. This article was originally published in audioXpress, April August 31, by Bill Reeve.

Because no one wants to listen to an audio amplifier that hums.

The Audio Voice Newsletter. August 5, by Bill Reeve.

Published Articles by Roger Russell

Antique tube radios are some of the most coveted vintage electronics any audio enthusiast can acquire. They sound absolutely great, both as for what they are intended – to work as a good old analog radio – but also as an amplifier for akdioxpress audio sources, including any digital source.


In this audioXpress article, from MayBill Reeve shares how to approach such projects and provides excellent advice. August 2, by Mark Driedger. Accurately setting the bias level for push-pull output stages is important to maximize amplifier performance and tube life. This circuit measures error relative to the target bias current and error relative to a balanced condition in the push-pull pair.

This article was originally published in audioXpress, Audioxprfss July 26, by Robert Nance Dee. In this high quality project, Robert Nance Dee designs a potentiometer audioxpreas accuracy and flexibility.

AudioXpress Magazine | Hifi Collective

A pot with 64 levels and precision metal film resistors that is hard to beat for sound or facility, as he describes auidoxpress. The project started with a clean sheet, looking to address potentiometer design with a quality that rivaled existing designs while maintaining a reasonable cost.

This article was originally published in audioXpress, September June 21, by Stephen W. Published in two separate parts in audioXpress October and Novemberthis hybrid amp design is a detailed and interesting project, frequently referenced by other DIY audio enthusiasts. We thought it was time to make it available online in its entirety, in the best possible quality.

Glass Audio Vault: The Remaking of a Champ

The article discusses the unity-gain, single-ended MOSFET output stage, the valve voltage amplification stage and wraps up with the power supplies, printed circuit boards, and construction.

June 8, by Simon Brown. Simon Brown rethinks what he needs as the amp that will be the centerpiece in his own audio system and perfects a previous design with a true hybrid design. This article was originally published in audioXpress, March May 31, by Vincent Thiernesse.


This article describes an improved design for a power supply dedicated to audio power amplifiers audiox;ress exhibits ecological and economical qualities, ideal for audio enthusiasts.

This project was originally published in audioXpress, June March 29, by Ron Tipton. This project is based on a previous audioXpress article: Ron Tipton was deeply impressed with this amplifier project which used only audioxprese transistors per channel, two of them being current sources. This article was originally published in the old audioXpress website as a PDF, but was never reposted. Now we make available online with updated references and links.

Audio Express AudioXpress Magazine October 2007 Hobby Audio Technology

February 25, by Rick Spencer. As Rick Spencer writes in its introduction, “In order for this beloved hobby of ours to thrive and survive well into the future, we must always strive to make it interesting to newcomers.

This article was originally published in audioXpress, October

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