Let The Music Play! High End 2017 Will be the Largest and Most Vibrant Ever!

The High End show is the world's foremost meeting place for the high-end audio industry, including emerging consumer audio technologies and personal audio. From 18 to 21 May 2017 the world’s biggest audio fair will open its doors at the MOC site in Munich. The High End is indisputably the number one international meeting point for audio enthusiasts and has been an institution for many years. This year will be the 36th edition in fact.

When necessary, audioXpress and Voice Coil staff posts notes pertaining to errata, corrections, and updates on this page.

"There is nothing quite like a quality tube amplifier," states the author in the introduction to this directly heated triode amplifier project. The idea for the amplifier started from the author's discovery of the Loftin-White circuit. The author chose the 2A3 directly heated triode power tube to implement the Loftin-White circuit. The 2A3 vacuum tube is a power triode capable of outputting 3.5 W in a single-ended Class A configuration. This article was originally published in audioXpress, August 2013.

A long-standing tradition, audioXpress' Focus on Test and Measurement 2017 is now available. Start with a thorough review of Audio Precision’s new APx1701 Transducer Interface; explore the DIM-100 device for interfacing and measuring with sound cards; build an Audio Dummy Load; learn how to measure Harmonic Distortion and discover the effects of Community Noise and their measurements. And just how good TIDAL's streaming quality actually is? All that and more in audioXpress March 2017. Get your copy now.

This article focuses on the Poddwatt Series II stereo integrated valve amplifier, a project with roots that go back several years. The design continues to be relevant and to evolve. I call the basic design an “Oddwatt” because of its “odd” configuration, using two stages. This article was originally published in audioXpress, May 2013.

Recently, I got bitten by the nostalgia bug and picked up a pair of old factory-wired Dynaco ST70s in pretty nice condition. On one of the Dynaco ST70s, I installed a new 6GH8 driver board instead of dealing with the rare 7199 issue, and I designed a small (3” × 3”) PCB to combine the bias supply and added the LED bias-setting circuit. This article was originally published in audioXpress, April 2013.

This Test Bench focuses on a new and extremely clever variable Bl 12″ diameter guitar speaker from Eminence — the 12″ Maverick, from the Eminence Patriot series, which uses their new FDM technology (Flux Density Modulation) to allow some really desirable distortion characteristics that have become the signature of blues and rock guitar playing. This article was originally published in Voice Coil, January 2011.

It’s very questionable that anyone would still be on the market for another USB 2.0 compact audio recording interface, given the market saturation and the transition to faster and lower-latency USB 3, Thunderbolt or even Ethernet alternatives already in the market. British company Audient believes there is still a chance and released the iD4, a single-channel unit featuring the company’s Class-A mic pre technology and good quality AD/DA converters for just $199.

In 2008, Nelson Pass submitted an article on its new F5 power amplifier design to audioXpress. At the time, he wrote: “I feel that it’s important to support AudioXpress, a magazine with which I have a 35 year history, and which also serves as a mainstay for the DIY community. Lately they have kindly printed projects that I had already posted on the web, but I decided that they deserve a little better than that.” Effectively, the F5 project was published in May 2008 and had a huge impact on the global DIY community and certainly contributed for the fact that audioXpress is still around today.

Many articles have appeared regarding projects using one of the most sturdy, versatile, and trustworthy audio tubes ever made — the 6550. Most of them show these audio beauties used in the push-pull configuration in order to obtain the greatest efficiency and the most power output. In this article, the 6550 is used in a clean, sweet-sounding, single-ended design. The amplifier has very few parts, is easy to build and repair, and the cost of the project is nominal when you consider the kind of sound that is produced. This article was originally published in audioXPress, September 2001.