All items tagged with tube amplifiers (81)

November 4, 2015 by Nelson Pass

The Sweet Spot

What can you do to ensure the best possible sound from your system? According to Nelson Pass, the “sweet spot” concept is generally regarded as “that happy balance of conditions that elicits the best possible sound,” including the interiors of the components themselves. This article was originally published by audioXpress, January 2010.

Sennheiser Reveals New HE 1 Orpheus Electrostatic Headphones

November 4, 2015 by audioXpress Staff

Sennheiser Reveals New HE 1 Orpheus Electrostatic Headphones

Following the intriguing teaser web campaign “Reshaping Excellence”, launched September 1st during an event in London to celebrate its 70th anniversary year, Sennheiser finally revealed the successor to the legendary Orpheus, originally introduced in 1990. The 2015 Orpheus reintroduces the concept of the world’s best headphones.

CE Distribution Announces Apex Tube Matching System

October 2, 2015 by audioXpress Staff

CE Distribution Announces Apex Tube Matching System

CE Distribution announced Apex Tube Matching - a new proprietary state-of-the art power tube matching system, designed to ensure the highest-quality matched tubes available. The company performs extensive testing and analysis on each tube that runs through the system to provide accurate and precision-matched tube sets.

Construct a Four-Parallel 5670W Push-Pull Amplifier

September 2, 2015 by Tadaatsu Atarashi

Construct a Four-Parallel 5670W Push-Pull Amplifier

When Noguchi, a Japanese audio transformer manufacturer, released its FINEMET core transformer FM-5P for less than $200, the author decided to try it in this four-parallel push-pull amplifier project. This article first appeared in the Japanese magazine Radio Technology, December 2011. It was published by audioXpress in March 2013.

High-Quality Tube Type Control Unit

July 15, 2015 by Joseph Norwood Still

High-Quality Tube Type Control Unit

This design by Joseph Norwood Still is a control unit that the author described as offering “lifelike concert-hall performance for a modest cost”. A great tube-based amplifier for phono and line sources, featuring a very subtle bass enhancement control using negative feedback to enhance only selected frequencies, below 400Hz. As the author described, a great project for discriminating audiophiles.

A 211 SE Triode Amp

March 30, 2015 by Nick Soudas

A 211 SE Triode Amp

Attention, all first-time (or wanna be) builders of single ended directly heated triode amps. This project’s for you. This is an easy to build, simple direct-coupled input/driver circuit that provides the proper drive voltage to the grid of the 211. A nice way to experiment with a single-ended (SE) triode amplifier.

The SPP Amplifier

March 18, 2015 by Helmut Otte

The SPP Amplifier

Here’s a long-forgotten, but still high-quality, power amp design that’s easy to build, requiring no esoteric tubes or parts. Originally published by audioXpress on May, 2003, this project was submitted by Helmut Otte, who worked at the University Of Applied Sciences Hamburg, after having started is electronics career at Philips Service department in Germany.

McIntosh Reissues Tube Classics MC75 and C22

March 16, 2015 by audioXpress Staff

McIntosh Reissues Tube Classics MC75 and C22

Since 1947, when McIntosh introduced its power amplifier design using its patented bifilar-wound dual-primary output transformer, the brand’s power amps have been considered the performance standard. The MC75 in considered one of the best tube classic amps of all times, while the C22 Preamplifier is the perfect “control center”. Now McIntosh decided to bring back those two classic designs.

A Versatile Line Amp for Preamp, Headphone, and Power Use

February 27, 2015 by Joseph Norwood Still

A Versatile Line Amp for Preamp, Headphone, and Power Use

Here’s a do-it-yourselfer’s dream in tube amp design: four operating modes, high quality, low cost, and low distortion. An article originally published by audioXpress in May 2007. A true versatile project which we think deserves to be shared.

Extend the useful life of those precious tubes: use a Tube Amplifier High-Voltage Delay

February 25, 2015 by Jan Didden

Extend the useful life of those precious tubes: use a Tube Amplifier High-Voltage Delay

Tube life can be extended if you delay the application of high voltage until after the heaters have warmed up and current can flow. This little module does just that: depending on the setting of a jumper, it delays the high-voltage for 40 or 60 seconds after the amplifier is switched on. And the module is available as a kit. This article was originally published in audioXpress, February 2014.

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