All items tagged with tube amplifiers (91)
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.
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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.
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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!
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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.
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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.
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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.
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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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Western Electric to Reintroduce Famous 300B Electron Tube
May 3, 2018 by Joao Martins

Western Electric to Reintroduce Famous 300B Electron Tube

The 150-year-old Western Electric will reintroduce its flagship product to market, the famous 300B electron tube. In time for its 80th anniversary, the 300B is returning to production this year, and the Rossville-based company announced they will restart the manufacturing in a brand new facility. Charles Whitener, Western Electric CEO, also confirmed the company will unveil a new single-ended amplifier called the 91E, as an homage to its famous predecessor the 91A, first introduced in 1936.
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The Dynaco ST-70 Series 3 Tube Amplifier is Now (Finally!) Shipping
May 1, 2018 by Joao Martins

The Dynaco ST-70 Series 3 Tube Amplifier is Now (Finally!) Shipping

Previewed in 2016, and originally scheduled for Spring 2017, Dynaco (a division of Radial Engineering Ltd.) announced the ST-70 Series 3 tube amplifier is now shipping. Since acquiring the legendary Hafler and Dynaco brands in 2014, Radial Engineering has been carefully working on the Dynaco ST-70 Series 3 tube amplifier, in an effort to create a truly worthy successor of one of the most successful tube amplifiers of all time. The result is finally available!
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A Three-Channel Tube-Based Guitar Preamplifier
March 7, 2018 by Peter Delos

A Three-Channel Tube-Based Guitar Preamplifier

Peter Delos details how to add tone controls to a three-channel tube-based guitar preamplifier. The circuit is a versatile building block anyone can use for his or her own preamplifier applications. The project is implemented with three 12AX7 gain stages. The tone control at the final output is a standard bass, mid, treble control circuit found in many guitar amplifiers. This article was originally published in audioxpress, October 2014
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