All items tagged with valves (154)

A Beginner 6BQ5 SE Amp

February 25, 2017 by Rick Spencer

A Beginner 6BQ5 SE Amp

Here’s an amp project especially for first-time builders featuring the 6BQ5 tube. 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." With this in mind, Rick Spencer created this single-ended design using the 6BQ5/EL84 tube in triode mode. This article was originally published in audioXpress, October 2008.

Relaunch of Legendary Dynaco ST-70 Series 3 Tube Amplifier Scheduled for Spring 2017

February 21, 2017 by Joao Martins

Relaunch of Legendary Dynaco ST-70 Series 3 Tube Amplifier Scheduled for Spring 2017

Following a preview at the 2016 High End show, in Munich, the relaunch of the Dynaco ST-70 Series 3 tube amplifier is now confirmed for Spring 2017, with the official launch already scheduled for High End 2017. Since acquiring the legendary brands Hafler and Dynaco in earlier 2014, Radial Engineering has been carefully working on the project, considering all the options to create a truly worthy successor of one of the most successful tube amplifiers of all times.

The 2A3 Tube Amplifier - A Tribute to Simplicity and Warm Sound

February 15, 2017 by Costa Sarris

The 2A3 Tube Amplifier - A Tribute to Simplicity and Warm Sound

"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.

audioXpress March 2017, Focus on Test and Measurement, Now Available!

February 13, 2017 by audioXpress Staff

audioXpress March 2017, Focus on Test and Measurement, Now Available!

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.

Poddwatt Series II Stereo Integrated Valve Amplifier

January 4, 2017 by Bruce Heran

Poddwatt Series II Stereo Integrated Valve Amplifier

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.

A Simple LED Bias Meter and Supply for the Dynaco ST70 and Other Tube Amplifiers

December 27, 2016 by Patrick Brunner

A Simple LED Bias Meter and Supply for the Dynaco ST70 and Other Tube Amplifiers

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.

Test Bench: Eminence Maverick Guitar Speaker

December 14, 2016 by Vance Dickason

Test Bench: Eminence Maverick Guitar Speaker

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.

Testing Loudspeakers: Which Measurements Matter, Part 2

November 16, 2016 by Joe D'Appolito

Testing Loudspeakers: Which Measurements Matter, Part 2

In this reference article, published by audioXpress in 2008, Joe D’Appolito shares his experiments with loudspeaker evaluation. In the two parts of this article, D’Appolito tries to answer the question: “Of all the measurements available to the designer, which ones are the best predictors of listener preference?" In over 30 years of designing loudspeakers, I have found the following measurements taken as a group provide the strongest predictor of loudspeaker preference available to us today,” he states.

100W Triode Amplifier

November 3, 2016 by Joseph Norwood Still

100W Triode Amplifier

When this great tube amp project was published originally in Glass Audio magazine, Ed Dell wrote “Joseph Norwood Still is pushing the envelope. His most recent triode design, which features the Svetlana 6550s and Hammond transformers, establishes new output limits—up to 100W.” Indeed, this would become a very popular project at the time, and still is, considering the frequent references. This article was originally published in Glass Audio 3, 2000.

HD-2: A Single-Ended Class-A Headphone Amp

October 18, 2016 by Jim Dungan

HD-2: A Single-Ended Class-A Headphone Amp

This Class A tube headphone amp project, which the author created for Vintage Audio, includes a 6SL7GT for the input stage and a 6AS7G for the driver, and is able to drive headphones with impedance at or above 64Ω. The article provides a full description of design fundamentals and some useful guidance on the construction process. The result, as the author describes, should be “a satisfying headphone amp that will provide years of enjoyment.” This article was originally published in audioXpress, June 2008.

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