All items tagged with tube amplifiers (84)

You Can DIY! A High-Voltage Delay for Tube Amplifiers - The Sequel

October 9, 2019 by Jan Didden

You Can DIY! A High-Voltage Delay for Tube Amplifiers - The Sequel

In this project for audioXpress magazine, Jan Didden offers a modern update on his original 2014 high-voltage delay design, which he built to complement tube amplifiers. The new unit needs no additional outside power, and allows setting the delay between 20 seconds and 254 seconds, which should cover all requirements. The article describes the complete project, and there's a DIY kit available at diyaudio.com. This article was originally published in audioXpress, November 2019.

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Fresh From the Bench: Dayton Audio HTA20BT Hybrid Stereo Tube Amplifier

July 24, 2019 by David Logvin

Fresh From the Bench: Dayton Audio HTA20BT Hybrid Stereo Tube Amplifier

David Logvin had the privilege to use, measure, and put to the test the Dayton Audio HTA20BT Hybrid Stereo Tube Amplifier. As he could confirm, there's something special in this amplifier that combines a tube preamp and Class-D power stage, which can also be used as a headphone amplifier, and features a digital media player and Bluetooth streaming capabilities. All at a very affordable price and with the build quality of a Dayton Audio product. This article was originally published in audioXpress, July 2019.

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audioXpress May 2019 Glass Audio Special is Now Available!

April 9, 2019 by audioXpress Staff

audioXpress May 2019 Glass Audio Special is Now Available!

For audioXpress May 2019 -Glass Audio Special - we’ve put together a very strong edition, with some of best tube experts sharing a series of DIY projects for all skill levels, from restoration projects to new amplifiers, preamps, and headphone amps. We review the Nu:Tekt HA-K1 headphone amplifier using the novel Korg Nutube 6P1 device, and interview the founder of Parks Audio. We go deep on measuring voltage regulator ripple rejection and we even look at square-wave testing. All inside audioXpress May 2019!

Constant Current for Tube Heaters. Extend the Life of Your Amplifier’s Vacuum Tubes

April 3, 2019 by Bill Reeve

Constant Current for Tube Heaters. Extend the Life of Your Amplifier’s Vacuum Tubes

In this article, Bill Reeve explains how to drive tube heaters with a constant current to lengthen the life of your vacuum tubes. As he explains, obviously, the best way to extend your amplifier’s vacuum tube life is to never turn it on. Some would say that the second best thing you can do is to never turn it off. The third and fourth options may be to gently turn on the tube heaters and not leave the B+ voltage on when the heater voltages are off. This article was originally published in audioXpress, May 2014.

audioXpress December 2018 Addresses Connected Audio Products and Voice Recognition

November 12, 2018 by audioXpress Staff

audioXpress December 2018 Addresses Connected Audio Products and Voice Recognition

For this last edition of 2018, audioXpress compiled a Voice Market Update that explores some of the latest developments and platforms for voice processing, with contributed articles from world-renowned experts in voice. The December 2018 edition reviews the ZOTL Ultralinear Power Amplifier from Linear Tube Audio; explains how to explore Soviet Germanium Transistors; and measures new SMT Low-Voltage JFETs. This is an edition you don't want to miss.

Consumer Technology Association Announces CES 2019 Best of Innovation Awards Honorees

November 12, 2018 by Joao Martins

Consumer Technology Association Announces CES 2019 Best of Innovation Awards Honorees

The CES Innovation Awards is an annual competition honoring outstanding design and engineering in consumer technology products. As in previous years, the Consumer Technology Association (CTA) announced the CES 2019 Innovation Honorees, including those products recognized as Best of Innovation Honorees, during the annual CES Unveiled event in New York. This year's nominees have a strong focus on sustainable and eco-friendly concepts. Audio products highlighted in the Innovation Awards include many surprises, including a Best of Innovation tube amplifier!

Book Review: Examining Fundamental Amplifier Techniques with Electron Tubes, 2nd Edition

September 26, 2018 by Richard Honeycutt

Book Review: Examining Fundamental Amplifier Techniques with Electron Tubes, 2nd Edition

Richard Honeycutt reviews the second and more extensive edition of this electronics classic, Fundamental Amplifier Techniques with Electron Tubes. He gives high marks to this massive tome that provides useful information about electron tube technology, including their power supplies, for the design and DIY construction of these electron tube audio amplifiers.

Differences in Amp Sound: How Do We Find the Truth?

August 29, 2018 by Richard Honeycutt

Differences in Amp Sound: How Do We Find the Truth?

audioXpress readers are well familiarized with Richard Honeycutt's Hollow State column. In many of his articles, Honeycutt explored distortion in a quest to find the origin of “tube sound.” In this article, he takes a more general view of possible amplifier differences, solid- or hollow-state, focusing on different amplifiers’s differences in sounds, and a correct subjective evaluation process of components and systems. This article was originally published in audioXpress, October 2012.

A Single-Ended “E-Linear” Power Amplifier

July 25, 2018 by Pete Millett

A Single-Ended “E-Linear” Power Amplifier

This simple single-ended amp project by Pete Millett is a great performer and a very well documented project that was immediately adopted by many DIY'er's. The amplifier achieves good power output and low distortion by employing “E-linear” feedback in the output stage. This article was published in audioXpress, April 2005.

A Double-Ended Two-Channel Amp

May 8, 2018 by Ari Polisois

A Double-Ended Two-Channel Amp

Following the publication of its original SE 6C33C amplifier in audioXpress July 2004, Ari Polisois returned with more information on how to further simplify the whole construction and reduce the costs. The results, as the author describes, "combine the advantage(s) of the push-pull (mainly power) to the wonderful character of the SE: sensitivity, smoothness, simplicity, and warmth (due to the 2nd harmonic content, easily tolerated by our ears, as against the third, fifth, seventh, and so on harmonics produced by the push-pull)." This article was originally published in audioXpress, February 2008.

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